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Chapter 5
Channel Configuration, Data, and Status

5–7

Proportional Counts Data Format – If the user selects proportional counts
data format, the data word for that channel is a number between –32,768 and
32,767. This provides the greatest resolution of all scaling options. The
value –32,768 corresponds to the lowest temperature value of the RTD type
or the lowest resistance value (ohms). The value 32,767 corresponds to the
highest temperature value for that RTD or the highest resistance value
(ohms). For example, if a 100

Ω

Platinum RTD (3916) is selected, then the

relationship of temperature and module counts is:

Temperature

Counts

–200

°

C

–32,768

+630

°

C

+32,767

Figure 5.3 shows the linear relationship between output counts and
temperature when one uses proportional counts data format.

Figure 5.3
Linear Relationship Between Temperature and Proportional Counts

+ 32,767

– 32,768

630

°

C

°

C

Counts

–200

°

C

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Summary of Contents for SLC 500 1746-NR4

Page 1: ...User Manual SLC 500t RTD Resistance Input Module Cat No 1746 NR4 Allen Bradley AB Spares ...

Page 2: ... office describes some important differences between solid state equipment and electromechanical devices that should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of this copyrighted publication in whole or in part without written permission of Allen Bradley Company Inc is prohibited Throughout this manual we use notes t...

Page 3: ... updated information in this release of the manual we have included change bars as shown to the right of this paragraph The table below lists sections that document new features and additional information about existing features and shows where to find this new information For This New Information See Calibration page xiii Single point calibration page xiv New Information AB Spares ...

Page 4: ...ral Diagnostic Features 1 6 System Overview 1 7 System Operation 1 8 Powerup 1 8 Module Operation 1 8 LED Status 1 9 Module to Processor Communication 1 10 Chapter 2 Required Tools and Equipment 2 1 Procedures 2 2 Chapter 3 Compliance to European Union Directives 3 1 EMC Directive 3 1 Electrostatic Damage 3 2 NR4 Power Requirements 3 2 Module Location in Chassis 3 3 Modular Chassis Considerations ...

Page 5: ...4 11 Response to Slot Disabling 4 11 Input Response 4 11 Output Response 4 11 Chapter 5 Channel Configuration 5 1 Channel Configuration Procedure 5 2 Configure Each Channel 5 2 Enter the Configuration Data 5 3 Input Type Selection Bits 0 3 5 5 Data Format Selection Bits 4 and 5 5 5 Using Scaled For PID and Proportional Counts Formats 5 5 Scaling Examples 5 8 Scaled for PID to Engineering Units 5 8...

Page 6: ...ce Configuration 6 1 Initial Programming 6 2 Procedure 6 3 Dynamic Programming 6 4 Procedure 6 4 Verifying Channel Configuration Changes 6 5 Interfacing to the PID Instruction 6 7 Using the Proportional Counts Data Format with the User set Scaling 6 9 Monitoring Channel Status Bits 6 10 Invoking Autocalibration 6 11 Chapter 7 Module Operation vs Channel Operation 7 1 Power Up Diagnostics 7 1 Chann...

Page 7: ...mmary 8 7 Program Listing 8 8 Data Table 8 9 Appendix A Electrical Specifications A 1 Physical Specifications A 1 Module Environmental Specifications A 2 Input Specifications A 2 Module Accuracy A 3 Resistance Device Compatibility A 5 Cable Specifications A 5 Appendix B Appendix C Channel Configuration Procedure C 1 Specifications RTD Standards Configuration Worksheet for RTD Resistance Module AB ...

Page 8: ...le to interpret the ladder logic instructions required to control your application If you do not contact your local Allen Bradley representative for information on available training courses before using this product If using Advanced Programming Software APS we recommend that you review The APS Quick Start for New Users Publication 9399 APSQS This manual is a reference guide for the 1746 NR4 RTD ...

Page 9: ...Examines the channel configuration word and the channel status word bit by bit and explains how the module uses configuration data and generates status during operation 6 Ladder Programming Examples Gives an example of the ladder logic required to define the channel for operation Also includes representative examples for unique programming requirements such as PID 7 Module Diagnostics and Troubles...

Page 10: ...test time possible APS Quick Start for New Users 9399 APSQS A procedural and reference manual for technical personnel who use an HHT to develop control applications Allen Bradley Hand Held Terminal User s Manual 1747 NP002 An introduction to HHT for first time users containing basic concepts but focusing on simple tasks and exercises and allowing the reader to begin programming in the shortest tim...

Page 11: ...ntial configuration word Contains the channel configuration information needed by the module to configure and operate each channel Information is written to the configuration word through the logic supplied in your ladder program cut off frequency The frequency at which the input signal is attenuated 3dB by the digital filter Frequency components of the input signal below the cut off frequency are...

Page 12: ...where all the chassis are located within several feet of the processor and chassis to chassis communication is via a 1746 C7 or 1746 C9 ribbon cable LSB Least Significant Bit Refers to a data increment defined as the full scale range divided by the resolution The LSB represents the smallest value within a string of bits multiplexer A switching system that allows several input signals to share a co...

Page 13: ... the SLC processor The following conventions are used throughout this manual Bulleted lists such as this one provide information not procedural steps Numbered lists provide sequential steps or hierarchical information Italic type is used for emphasis Text in this font indicates words or phrases you should type Allen Bradley offers support services worldwide with over 75 Sales Support Offices 512 a...

Page 14: ...otify us of it on the enclosed Publication Problem Report If you have any suggestions for how this manual could be made more useful to you please contact us at the address below Allen Bradley Company Inc Control and Information Group Technical Communication Dept A602V T122 P O Box 2086 Milwaukee WI 53201 2086 ...

Page 15: ...Preface P 8 Notes AB Spares ...

Page 16: ...TD consists of a temperature sensing element connected by 2 3 or 4 wires that provide input to the RTD module The module supports connections from any combination of up to four RTDs of various types for example platinum nickel copper or nickel iron or other resistance inputs As shown in Figure 1 1 the RTD module supplies a small current to each RTD connected to the module inputs up to 4 input chan...

Page 17: ...mplified RTD Module Circuit RTD µP Circuit RTD0 Sense Return IC 0 5 or 2 mA Constant Current Source A D Conversion Digital Data Backplane RTD1 RTD2 RTD Module RTD3 Digital Data RTD Sense Return RTD Sense Return RTD Sense Return AB Spares ...

Page 18: ... F to 1166 F 200 C to 630 C 328 F to 1166 F 0 1 C 0 2 F 0 2 C 0 4 F 1000W 200 C to 630 C 328 F to 1166 F 200 C to 230 C 328 F to 446 F 0 1 C 0 2 F 0 2 C 0 4 F Copper 426 10W Not allowed 100 C to 260 C 148 F to 500 F 0 1 C 0 2 F 0 2 C 0 4 F Nickel 618 120W 100 C to 260 C 148 F to 500 F 100 C to 260 C 148 F to 500 F 0 1 C 0 2 F 0 1 C 0 2 F Nickel 672 120W 80 C to 260 C 112 F to 500 F 80 C to 260 C 1...

Page 19: ...tance change per ohm per C For instance Platinum 385 refers to a platinum RTD with α 0 00385 ohms ohm C or simply 0 00385 C The accuracy values assume that the module was calibrated within the specified temperature range of 0 C to 60 C 32 F to 140 F Actual value at 0 C is 9 042W per SAMA standard RC21 4 1966 Actual value at 0 C is 100W per DIN standard To maximize the relatively small RTD signal o...

Page 20: ... dependant on the excitation current 0 006Ω C at 0 5 mA 0 004Ω at 2 0 mA The accuracy values assume that the module was calibrated within the specified temperature range of 0 C to 60 C 32 F to 140 F Hardware Overview The RTD module fits into a single slot of an SLC 500 modular system except the processor slot 0 fixed system expansion chassis 1746 A2 The module uses eight input words and eight outp...

Page 21: ...7 Table 1 D Hardware Features 1 Channel Status LED Indicators green Display operating and fault status of channels 0 1 2 and 3 2 Module Status LED green Displays module operating and fault status 3 Removable Terminal Block Provides physical connection to input devices Part 1746 RT25G 4 Cable Tie Slots Secure wiring from module 5 Door Label Provides terminal identification 6 Side Label Nameplate Pr...

Page 22: ...3 or 4 wire RTD sensors or from resistance input devices You configure each channel to accept either input When configured for RTD input types the module converts the RTD readings into linearized digital temperature readings in C or F When configured for resistance inputs the module provides a linear resistance value in ohms Important The RTD module is designed to accept input from RTD sensors wit...

Page 23: ...hort circuit over range and under range If such a condition is detected a unique bit is set in the channel status word and the channel status LED blinks indicating a channel error condition The SLC processor reads the converted RTD or resistance data from the module at the end of the program scan or when commanded by the ladder program The processor and RTD module determine that the backplane data...

Page 24: ...Status If OFF at any time other than at powerup this LED indicates that non recoverable module errors for example diagnostic or operating errors have occurred The LED is ON if there are no module errors The status of each LED during each of the operational states for example powerup module operation and error is depicted in the following table Table 1 E LED POWER UP MODULE OPERATION No Error MODUL...

Page 25: ...Image Word Function Output Image Word Function 0 Channel 0 data 0 Channel 0 configuration 1 Channel 1 data 1 Channel 1 configuration 2 Channel 2 data 2 Channel 2 configuration 3 Channel 3 data 3 Channel 3 configuration 4 Channel 0 status 4 User set Lower limit scale 0 5 Channel 1 status 5 User set Upper limit scale 0 6 Channel 2 status 6 User set Lower limit scale 1 7 Channel 3 status 7 User set U...

Page 26: ... are unfamiliar with the terms used or concepts presented in the procedural steps always read the referenced chapters and other recommended documentation before trying to apply the information This chapter tells you what equipment you need explains how to install and wire the module shows you how to set up one channel for RTD or resistance input examines the state of the LEDs at normal startup exa...

Page 27: ...ity table found in chapter 3 For modular style systems calculate the total load on the system power supply using the procedure described in the SLC Installation Operation Manual for Modular Style Controllers Publication Number 1747 6 2 or the SLC 500 Family System Overview Publication Number 1747 2 30 Chapter 3 Installation and Wiring Appendix A Specifications 3 Procedure Inserting Module Referenc...

Page 28: ... 2 Sense Chl 3 Sense Chl 2 Return Chl 3 Return Shield Shield Beldent 9501 Shielded Cable RTD Return Chl 0 RTD Chl 0 Sense Chl 0 Return Shield Cable Shield RTD Return Sense RTD Sense Return 3 Wire RTD Interconnection 4 Wire RTD Interconnection Chl 0 Sense Chl 0 Return Shield Beldent 83503 or Beldent 9533 Shielded Cable Cable Shield RTD Return RTD Sense Return Cable Shield Sense RTD Return Chl 0 RTD...

Page 29: ...see chapter 3 Chl 0 RTD Chl 0 Sense Chl 0 Return Shield Cable Shield Potentiometer Add Jumper RTD Return Chl 0 RTD Chl 0 Sense Chl 0 Return Shield RTD Return Potentiometer Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance Add Jumper Belden 9501 Shielded Cable AB Spares ...

Page 30: ...hield Potentiometer Run RTD and sense wires from module to potentiometer terminal RTD Sense Return and tie them to one point Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance Belden 83503 or Belden 9533 Shielded Cable Belden 83503 or Belden 9533 Shielded Cable Belden 83503 or Belden 9533 Shielded Ca...

Page 31: ...t the prompt on the I O configuration display No manual entry of special I O configuration SPIO CONFIG information is required as the module ID code automatically assigns the number of input and output words required by the module Additional information about how to configure your system can be found in the APS Quick Start for New Users Publication 9399 APSQS Example of Software Prompt Chapter 4 P...

Page 32: ... 0 0 0 0 0 0 0 0 0 Channel 0 Configuration Word Word 0 Input Type Select Data Format Select Broken Input Select Temperature Units Select Filter Frequency Select Channel Enable 8 words 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 Default Settings New Setting Set this bit 11 to enable channel Address O 1 0 11 100 W Platinum RTD 385 Engineering Units x 1 0 1 step Broken Input set data word to zero Degrees Celsius...

Page 33: ...hannel enable N10 0 11 3 Program an instruction in your ladder logic to copy the contents of N10 0 to output word O 1 0 Figure 2 6 Chapter 6 Ladder Programming Examples Chapter 8 Application Examples Figure 2 6 Initial Configuration Word Setting Dest O 1 0 Length 1 On power up the first pass bit S 1 15 is set for one scan enabling the COPY instruction that transfers a one to bit 11 of channel conf...

Page 34: ...dder programming using the APS software can be found in the APS User Manual Publication 9399 APSUM Chapter 5 Channel Configuration Data and Status Chapter 6 Ladder Programming Examples Chapter 8 Application Examples your programming software s user manual Figure 2 7 Input Image Detail Channel 1 Data Word Channel 2 Data Word Channel 3 Data Word Output Image SLC 500 Controller Data Files Bit 15 Bit ...

Page 35: ...C and put the controller into Run mode In this exam ple during a normal start up the module status LED Figure 2 8 and channel 0 status LED turn on Chapter 7 Module Diagnostics and Troubleshooting Figure 2 8 LED Status 0 1 2 3 INPUT Channel LEDs Module Status LED MODULE STATUS CHANNEL RTD resistance STATUS AB Spares ...

Page 36: ...pter 7 Module Diagnostics and Troubleshooting Chapter 8 Application Examples Figure 2 9 Monitoring Status Channel 1 Data Word Channel 2 Data Word Channel 3 Data Word Output Image SLC 500 Controller Data Files Bit 15 Bit 0 Word 1 Word 2 Word 3 Address I 1 4 Input Image Channel 0 Data Word Word 0 Word 7 8 words Channel 1 Status Word Channel 2 Status Word Channel 3 Status Word Channel 0 Status Word 0...

Page 37: ...Chapter 2 Quick Start 2 12 Notes AB Spares ...

Page 38: ... European Union and EEA regions It has been designed and tested to meet the following directives EMC Directive This product is tested to meet Council Directive 89 336 EEC Electromagnetic Compatibility EMC and the following standards in whole or in part documented in a technical construction file EN 50081 2 EMC Generic Emission Standard Part 2 Industrial Environment EN 50082 2 EMC Generic Immunity ...

Page 39: ...from the backplane connector Do not touch backplane connector pins Keep the module in its static shield bag when not in use or during shipment The RTD module receives its power through the SLC500 chassis backplane from the fixed or modular 5V dc 24V dc chassis power supply The maximum current drawn by the module is shown in the table below 5V dc Amps 24V dc Amps 0 050 0 050 When you are using a mo...

Page 40: ... the table at the left to determine whether the combination can be supported In the table A dot indicates a valid combination No symbol indicates an invalid combination A triangle indicates an external power supply is required Refer to the Analog I O Module User Manual 1746 6 4 When using the table be aware that there are certain conditions that affect the compatibility characteristics of the BASI...

Page 41: ...__________ Removing the Terminal Block ATTENTION Never install remove or wire modules with power applied to the chassis or devices wired to the module To avoid cracking the removable terminal block alternate the removal of the slotted terminal block release screws 1 Loosen the two terminal block release screws Figure 3 1 Figure 3 1 Terminal Block Release Screws Terminal Block Release Screws Max To...

Page 42: ...elease s 2 Slide the module into the chassis until both top and bottom retaining clips are secured Apply firm even pressure on the module to attach it to its backplane connector Never force the module into the slot 3 Cover all unused slots with the Card Slot Filler Catalog Number 1746 N2 Removing the Module 1 Press the releases at the top and bottom of the module and slide the module out of the ch...

Page 43: ... Channel 0 RTD Channel 2 Return Shield Max Torque 0 6 Nm 5 3 in lbs Max Torque 0 6 Nm 5 3 in lbs NR4 Wiring Considerations Follow the guidelines below when planning your system wiring Since the operating principle of the RTD module is based on the measurement of resistance take special care in selecting your input cable For 2 wire or 3 wire configuration select a cable that has a consistent impeda...

Page 44: ... wire The module s terminal block accepts two AWG 14 gauge wires To limit overall cable impedance keep input cables as short as possible Locate your I O chassis as near the RTD sensors as your application will permit Ground the shield drain wire at one end only The preferred location is at the RTD module Refer to IEEE Std 518 Section 6 4 2 7 or contact your sensor manufacturer for additional detai...

Page 45: ...ld Belden 9501 Shielded Cable RTD Return Chl 0 RTD Chl 0 Sense Chl 0 Return Shield Cable Shield RTD Return Sense RTD Sense Return 3 Wire RTD Interconnection 4 Wire RTD Interconnection Chl 0 Sense Chl 0 Return Shield Belden 83503 or Belden 9533 Shielded Cable Cable Shield RTD Return RTD Sense Return Cable Shield Sense RTD Return Chl 0 RTD Add Jumper Chl 0 Sense Chl 0 Return Shield Chl 0 RTD Belden ...

Page 46: ...e temperature or resistance value accuracy the resistance difference of the cable lead wires must be equal to or less than 0 01Ω There are several ways to insure that the lead values match as closely as possible They are as follows Keep lead resistance as small as possible and less than 25 Ω Use quality cable that has a small tolerance impedance rating Use a heavy gauge lead wire which has less re...

Page 47: ...ction Chl 0 RTD Chl 0 Sense Chl 0 Return Shield Cable Shield Potentiometer Add Jumper RTD Return Chl 0 RTD Chl 0 Sense Chl 0 Return Shield RTD Return Potentiometer Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance Add Jumper Belden 9501 Shielded Cable AB Spares ...

Page 48: ... Return and tie them to one point Chl 0 RTD Chl 0 Sense Chl 0 Return Shield Cable Shield Potentiometer RTD Sense Return Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance Belden 83503 or Belden 9533 Shielded Cable Belden 83503 or Belden 9533 Shielded Cable Run RTD and sense wires from module to poten...

Page 49: ...p Then earth ground at the shield terminal 4 At the other end of the cable cut the drain wire and foil shield back to the cable and apply shrink wrap 5 Connect the signal wires and cable shield to the NR4 terminal block and the input 6 Repeat steps 1 through 5 for each channel on the NR4 module Wiring Input Devices to the NR4 Module Figure 3 7 Shielded Cable Foil Shield Drain Wire See step 3 Signa...

Page 50: ... three input lines for the channel are connected to analog common The module s A D converters are configured for the proper gain and filter frequency that is appropriate for your RTD configuration Autocalibration performs an A D conversion on the zero voltage analog common and the full scale voltage A D reference voltage on the following signals lead wire signal RTD resistance signal excitation cu...

Page 51: ...libration is performed additional calibrations only need to be performed if the cable is disturbed or degraded RTD replacement should not affect the accuracy of the procedure However periodic autocalibrations should be performed Follow the steps below to perform a single point calibration 1 Cycle power to the SLC 500 chassis 2 Select a calibration temperature that is near the control point 10 C 3 ...

Page 52: ... code defines for the processor the type of I O or specialty module residing in a specific slot in the 1746 chassis With APS version 5 0 or later select the 1746 NR4 RTD module from the list of modules on the system I O configuration display to automatically enter the ID code With earlier versions of APS version 1 04 through 4 02 01 you must manually enter the module identification code when confi...

Page 53: ... Word 5 O e 5 Word 6 O e 6 User set Lower Scale Limit Range 0 User set Upper Scale Limit Range 0 User set Lower Scale Limit Range 1 User set Upper Scale Limit Range 1 Output Image Configuration Words The 8 word RTD module output image defined as the output from the CPU to the RTD module contains information that you configure to define the way a specific channel on the RTD module will work These w...

Page 54: ...put word 6 of the RTD module located in slot 3 in the SLC chassis use address I 3 6 I 3 6 File Type Slot Word Element Delimiter Word Delimiter Chapter 5 Channel Configuration Data and Status gives you detailed bit information about the content of the data word and the status word The RTD module uses a digital filter that provides noise rejection for the input signals The digital filter is programm...

Page 55: ...al value This means that if an input signal changes faster than the channel step response a portion of that signal will be attenuated by the channel filter Table 4 A shows the step response for each filter frequency Table 4 A Notch Frequencies Filter Frequency 50 Hz NMR 60 Hz NMR Cut Off Frequency Step Response 10 Hz 100 dB 100 dB 2 62 Hz 300 msec 50 Hz 100 dB 13 1 Hz 60 msec 60 Hz 100 dB 15 72 Hz...

Page 56: ...0 2 C 0 4 F 0 2 C 0 4 F 0 3 C 0 5 F 500W Pt RTD 3916 0 1 C 0 2 F 0 2 C 0 4 F 0 2 C 0 4 F 0 3 C 0 5 F 1000W Pt RTD 3916 0 1 C 0 2 F 0 2 C 0 4 F 0 2 C 0 4 F 0 3 C 0 5 F 10W Cu RTD 426 0 2 C 0 4 F 0 3 C 0 5 F 0 3 C 0 5 F 0 4 C 0 7 F 120W Ni RTD 618 0 1 C 0 2 F 0 1 C 0 2 F 0 1 C 0 2 F 0 2 C 0 4 F 120W Ni RTD 672 0 1 C 0 2 F 0 1 C 0 2 F 0 1 C 0 2 F 0 2 C 0 4 F 604W NiFe RTD 518 0 1 C 0 2 F 0 1 C 0 2 F ...

Page 57: ...onents above the cut off frequency are increasingly attenuated as shown in the following figures The cut off frequency for each input channel is defined by its filter frequency selection Table 4 A shows the input channel cut off frequency for each filter frequency Choose a filter frequency so that your fastest changing signal is below that of the filter s cut off frequency The cut off frequency sh...

Page 58: ...ency 200 180 160 140 120 100 80 60 40 20 0 0 10 20 30 40 50 60 Frequency Response Amplitude in dB Hz Frequency 2 62 Hz 3 dB Figure 4 3 50 Hz Filter Notch Frequency 200 180 160 140 120 100 80 60 40 20 0 0 50 100 150 200 250 300 13 1 Hz 3 dB Amplitude in dB Frequency Hz Frequency Response ...

Page 59: ... 180 160 140 120 100 80 60 40 20 0 0 60 120 180 240 300 Frequency Response Amplitude in dB Frequency 15 72 Hz 3 dB Hz Figure 4 5 250 Hz Filter Notch Frequency 200 180 160 140 120 100 80 60 40 20 0 0 250 500 750 1000 1250 1500 Frequency Response Amplitude in dB Frequency 65 5 Hz 3 dB Hz AB Spares ...

Page 60: ... ms 250 Hz 388 ms Update Time and Scanning Process Figure 4 6 shows the scanning process for the RTD module assuming that the module is running normally and more than one channel is enabled The scanning cycle is shown for the situation where channels 0 and 1 are enabled and channels 2 and 3 are not used Important The scanning process of Figure 4 6 is similar for any number of enabled channels Chan...

Page 61: ...me occurs when four channels each using a 10 Hz filter frequency are enabled Module Update Time 4 305 ms 1220 ms Figure 4 6 Scanning Cycle Wait for Channel 0 A D Conversion Read Channel 0 A D Wait for Channel 1 A D Conversion Read Channel 1 A D Configure and Start Channel 0 A D Start Configure and Start Channel 1 A D Calculate Channel 1 Data Channel 0 Channel 1 Scan Cycle With Channels 0 1 Enabled...

Page 62: ...llowing S 250 Hz Filter 124 milliseconds S 60 Hz Filter 504 milliseconds S 50 Hz Filter 604 milliseconds S 10 Hz Filter 3 004 milliseconds By writing to the status file in your modular SLC processor you can disable any chassis slot Refer to your SLC programming manual for the slot disable enable procedure ATTENTION Always understand the implications of disabling a RTD module in your application be...

Page 63: ...Chapter 4 Preliminary Operating Considerations 4 12 Notes AB Spares ...

Page 64: ...aling format other than the module default when using the proportional counts data format You can use words 4 and 5 to define one user set range and words 6 and 7 to define a second range A bit by bit examination of the configuration word is provided in Table 5 A Programming is discussed in chapter 6 Addressing is explained in chapter 4 Figure 5 1 Module Output Image Configuration Word CH 0 Config...

Page 65: ... is configured for RTD inputs and engineering units data format determine if you want the channel data word to read in degrees Fahrenheit or degrees Celsius and enter a one or a zero in bit 8 Temperature Units of the configuration word If the channel is configured for a resistance input this field is ignored 5 Determine the desired input filter frequency for the channel and enter the 2 digit binar...

Page 66: ...used 10 Build the channel configuration word using the configuration worksheet on page iv for every channel on each RTD module repeating the procedures given in steps 1 9 Enter the Configuration Data Following the steps outlined in chapter 2 Quick Start or chapter 6 Ladder Programming Examples enter your configuration data into your ladder program and copy it to the RTD module ...

Page 67: ... Set to Downscale ÉÉÉ ÉÉÉ 1 0 ÉÉÉÉÉÉÉ ÉÉÉÉÉÉÉ Invalid ÉÉÉ ÉÉÉ ÉÉ ÉÉ 1 ÉÉÉ ÉÉÉ 1 8 T m ratur units s l tion Degrees C ÉÉÉ ÉÉÉ 0 8 Temperature units selection Degrees F ÉÉÉ ÉÉÉ 1 10 Hz ÉÉÉ 0 0 9 10 Filt r fr qu n y s l tion 50 Hz ÉÉÉ ÉÉÉ 0 1 9 10 Filter frequency selection 60 Hz ÉÉÉ ÉÉÉ 1 0 250 Hz ÉÉÉ ÉÉÉ 1 1 11 Chann l nabl Channel Disabled ÉÉÉ ÉÉÉ 0 11 Channel enable Channel Enabled ÉÉÉ ÉÉÉ 1 12 E...

Page 68: ...ange based on the scaling select bits 13 and 14 and scale limit words O e 4 O e 5 or O e 6 O e 7 Using Scaled For PID and Proportional Counts Formats The RTD module provides eight options for displaying input channel data These are 0 1 F 0 1 C 1 F 1 C 0 1Ω 1Ω Scaled for PID and Proportional Counts The first six options represent real engineering units and do not require explanation The Scaled for ...

Page 69: ...The value 16383 corresponds to the highest temperature value for that RTD or the highest resistance value ohms For example if a 100Ω Platinum RTD α 0 003916 is selected then the relationship of temperature and module counts is Temperature Counts 200 C 0 630 C 16383 Figure 5 2 shows the linear relationship between output counts and temperature when one uses scaled for PID data format Figure 5 2 Lin...

Page 70: ...pe or the lowest resistance value ohms The value 32 767 corresponds to the highest temperature value for that RTD or the highest resistance value ohms For example if a 100 Ω Platinum RTD 3916 is selected then the relationship of temperature and module counts is Temperature Counts 200 C 32 768 630 C 32 767 Figure 5 3 shows the linear relationship between output counts and temperature when one uses ...

Page 71: ...nnel Data Word Format Table 5 C through Table 5 H SLOW 200 C and SHIGH 850 C Solution Scaled for PID Equivalent 16383 x 344 C 200 C 850 C 200 C 8488 Proportional Counts to Engineering Units Equation Engr Units Equivalent SLOW SHIGH SLOW x Proportional Counts value displayed 32768 65536 Assume that input type is a potentiometer 1000W range 0 to 1000W proportional counts display type Channel data 21...

Page 72: ...o 1166 0 to 16383 32768 to 32767 500 W Platinum 3916 2000 to 6300 3280 to 11660 200 to 630 328 to 1166 0 to 16383 32768 to 32767 120 W Nickel 672 800 to 2600 1120 to 5000 80 to 260 112 to 500 0 to 16383 32768 to 32767 120 W Nickel 618 1000 to 2600 1480 to 5000 100 to 260 148 to 500 0 to 16383 32768 to 32767 604 W Nickel Iron 518 1000 to 2000 1480 to 3920 100 to 200 148 to 392 0 to 16383 32768 to 3...

Page 73: ...0W 0 to 15000 0 to 1500 0 to 16383 32768 to 32767 When ohms are selected the temperature units selection bit 8 is ignored Table 5 H Data Format for 500W and 1000W Resistance Input Data Format Resistance Input Type Engineering Units x 1 Engineering Units x 10 cale for PI Proportional Counts Resistance Input pe 0 1 Ohms 1 0 Ohms Scaled for PID Proportional Counts Default 500W 0 to 5000 0 to 500 0 to...

Page 74: ...tinum 3916 0 1 C step 0 1 F step 1 C step 1 F step 0 0507 C step 0 0912 F step 0 0127 C step 0 0228 F step 1000 W Platinum 3916 0 1 C step 0 1 F step 1 C step 1 F step 0 0507 C step 0 0912 F step 0 0127 C step 0 0228 F step 10 W Copper 426 0 1 C step 0 1 F step 1 C step 1 F step 0 0220 C step 0 0396 F step 0 0051 C step 0 0099 F step 120 W Nickel 618 0 1 C step 0 1 F step 1 C step 1 F step 0 0220 ...

Page 75: ...This can happen if the RTD or its signal wires are shorted together for any reason The short circuit condition does not apply to resistance ranges since they start at 0 ohms which can be a short circuit condition Table 5 M Bit Descriptions for Broken Input Selection Binary Value Select Description 00 zero force the channel data word to 0 during an open circuit condition or short circuit condition ...

Page 76: ...ring 11 250 Hz provide 250 Hz AC noise filtering This setting decreases the noise rejection but also decreases the channel update time Channel Enable Selection Bit 11 Table 5 P shows the description for bit 11 You use the channel enable bit to enable a channel The RTD module only scans those channels that are enabled To optimize module operation and minimize throughput times you should disable unu...

Page 77: ...tive for all inputs A lower current reduces the error due to RTD self heating but provides a lower signal to noise ratio Refer to RTD vendor for recommendations See page ii for general information Table 5 Q Bit Description for Excitation Current Selection Binary Value Select Description 0 2 0 mA set the excitation current to 2 0 mA 1 0 5 mA set the excitation current to 0 5 mA Scaling Select Bits ...

Page 78: ...efined scaling Refer to page 5 6 scaled for PID and 5 7 proportional counts for considerations when using default values User set Scaling Proportional Counts The second case to consider is User set Scaling using proportional counts when the scaling select bits 13 and 14 are set to 01 or 10 Here the user can configure the module to scale the data word to something other than 32 768 to 32 767 Howeve...

Page 79: ...caling Words 4 to 7 Figure 5 5 shows the address of the user set limit scale words used to define the lower value and the upper value of the user set scale words You can use these words when bits 13 and 14 scaling select of the channel configuration word are 01 Limit Scale 0 and proportional counts mode is selected bits 13 and 14 scaling select of the channel configuration word are 10 Limit Scale ...

Page 80: ...efines lower scale limit for range 0 0 15 0 15 0 15 0 15 O e 4 O e 5 O e 6 O e 7 Defines upper scale limit for range 0 Defines lower scale limit for range 1 Defines upper scale limit for range 1 Range 0 Range 1 Unused Bit 15 Bit 15 is not used Ensure that this bit is always cleared 0 ...

Page 81: ...our configuration for the channel When an input channel is disabled its data word is reset 0 Two conditions must be true for the value of the data word shown in Figure 5 6 to be valid The channel must be enabled channel status bit 1 There must be no channel errors channel error bit 0 Figure 5 6 Module Input Image Data Word CH 0 Data Word 0 15 0 15 0 15 0 15 I e 0 I e 1 I e 2 I e 3 CH 1 Data Word C...

Page 82: ...eros This condition tells you that input data contained in the data word for that channel is not valid and should be ignored Figure 5 7 Module Input Image Status Word CH 0 Status Word 0 15 0 15 0 15 0 15 I e 4 I e 5 I e 6 I e 7 CH 1 Status Word CH 2 Status Word CH 3 Status Word The channel status word can be analyzed bit by bit Each bit s status 0 or 1 tells you how the input data from the RTD sen...

Page 83: ...ÉÉ ÉÉ 1 ÉÉÉÉÉÉÉÉ ÉÉÉÉÉÉÉÉ Not used 8 Temperature units status 0 Degrees C 8 Temperature units status 1 Degrees F 0 0 10 Hz 9 10 Filter frequency status 0 1 50 Hz 9 10 Filter frequency status 1 0 60 Hz 1 1 250 Hz 11 Channel enable status 0 Channel Disabled 11 Channel enable status 1 Channel Enabled 12 Excitation current status 0 2 0 mA 12 Excitation current status 1 0 5 mA 13 Broken input error sta...

Page 84: ...tion word when the channel is enabled If the channel is disabled these bits are cleared 0 Broken Input Status Bits 6 and 7 The broken input bit field indicates how you have defined the channel data to respond to an open circuit or short circuit condition This field reflects the broken input type selected in bits 6 and 7 of the channel configuration word when the channel is enabled If the channel i...

Page 85: ... enabled channel detects a broken input condition A broken input error is declared for the following reasons Open circuit excitation current is less than 50 of the selected current Short circuit calculated lead wire compensated RTD resistance is less than 3 ohms The open circuit error is active for all RTD and resistance inputs while the short circuit error is valid only for RTD inputs If a broken...

Page 86: ...input default scaling This bit is cleared 0 for the following conditions Channel is disabled Channel operation is normal the out of range condition clears Broken input error bit bit 13 is set 1 Configuration Error Bit 15 This bit is set 1 whenever an enabled and configured channel detects that the channel configuration word is not valid A configuration word is not valid for any of the following re...

Page 87: ...Chapter 5 Channel Configuration Data and Status 5 24 Notes AB Spares ...

Page 88: ...interfacing the RTD module to a PID instruction using proportional counts scaling example monitoring channel status bits invoking autocalibration Figure 6 1 is used for clarification of the ensuing ladder logic examples and is not intended to represent an RTD application Important Chapter 8 shows a typical application for the RTD module Figure 6 1 Application Setup SLC Processor 1746 NR4 RTD Modul...

Page 89: ...a Word Degrees Fahrenheit F 10 Hz Filter Frequency Channel Enabled 2 0 mA Excitation Current Default Scaling Not Used This example transfers configuration data and sets the channel enable bits of all four channels with a single file copy instruction The file copy instruction copies 4 data words from an integer file you create in the SLC s memory to the RTD module s channel configuration words Figu...

Page 90: ...0000 1001 0001 0001 Press a key or enter value N10 3 0 offline no forces binary data decimal addr File EXMPL F7 F5 NEXT FILE SPECIFY ADDRESS F8 PREV FILE F1 CHANGE RADIX 1 1 3 Use the copy file instruction COP to copy the contents of integer file N10 to the four consecutive output words of the RTD module beginning with O 3 0 To do this program a rung as shown in Figure 6 4 All elements are copied ...

Page 91: ...th element N10 4 2 Using APS data monitor function enter the same configuration data as in the previous example except for bit 8 Bit 8 is now set for a logic 0 C Figure 6 5 Program To Change Configuration Word Data COP COPY FILE Source N10 0 Dest O 3 0 Length 4 S 1 15 Set up all four channels Rung 2 0 0 Set channel 2 to display in C Rung 2 1 B3 0 I 1 0 MOVE Source N10 4 Dest O 3 2 MOV OSR Rung 2 2...

Page 92: ...ration changes have taken effect Example Execute a dynamic configuration change to channel 2 of the RTD module located in slot 3 of a 1746 chassis and set an internal data valid bit when the new configuration has taken effect Figure 6 6 Program To Verify Configuration Word Data Changes COP COPY FILE Source N10 0 Dest O 3 0 Length 4 S 1 15 Set up all four channels Rung 2 0 Set channel 2 to display ...

Page 93: ...nfiguration written to channel 2 is being echoed back in channel 2 s status word EQU B3 3 Data valid Rung 2 5 END Data Table address 15 data 0 address 15 data 0 N10 0 0000 1001 0001 0001 N10 3 0000 1001 0001 0001 N10 1 0000 1001 0001 0001 N10 4 0000 1000 0001 0001 N10 2 0000 1001 0001 0001 AB Spares ...

Page 94: ...e PID instruction parameters Maximum Scaled Smax word 7 and Minimum Scaled Smin word 8 match the module s minimum and maximum scaled range in engineering units e g 200 C to 850 C for that channel This allows you to accurately enter the setpoint in engineering units C F Figure 6 7 Programming for PID Application MOVE Source N10 0 Dest O 3 0 First Pass Bit S 1 15 Rung 2 0 MOV Initialize NR4 Channel ...

Page 95: ... and Offset parameters should be set per your application The Dest is typically an analog output channel Refer to the APS User Manual or Analog I O Modules User Manual for specific examples of the SCL instruction Rung 2 3 END Data Table address 15 data 0 address 15 data 0 N10 0 0000 1000 0010 0100 AB Spares ...

Page 96: ...nts are copied from the specified source address N10 0 to the specified output O 3 0 Each element is a 16 bit integer as shown in the data table at the bottom of the page COP COPY FILE Source N10 0 Dest O 3 0 Length 6 First Pass Bit S 1 15 Initialize RTD module Rung 2 1 SCL SCALE Source I 3 0 Rate 10000 Offset Dest The Source of this instruction is the data word from the RTD module which is a numb...

Page 97: ...mming to Monitor Channel Status COPY FILE Source N10 0 Dest O 3 0 Length 4 First Pass Bit S 1 15 Rung 2 0 COP Initialize RTD module 11 Rung 2 1 Channel 0 Status I 3 4 I 3 4 13 O 2 0 0 Channel 0 Open or Short Channel 0 Alarm 11 Rung 2 2 Channel 1 Status I 3 5 13 O 2 0 1 Channel 1 Open or Short Channel 1 Alarm I 3 5 11 Rung 2 3 Channel 2 Status I 3 6 I 3 6 13 O 2 0 2 Channel 2 Open or Short Channel ...

Page 98: ...henever an event occurs that greatly changes the internal temperature of the control cabinet such as opening or closing its door at a convenient time when the system is not making product such as during a shift change ATTENTION Several channel cycles are required to perform an autocalibration and it is important to remember that during autocalibration the module is not converting input data Exampl...

Page 99: ...TD module responds to processor commands much more frequently than it updates its own LEDs Therefore it is normal to execute these two rungs and have the RTD module perform an autocalibration of channel 0 without the channel 0 LED ever changing state AB Spares ...

Page 100: ...uit or short circuit RTDs only detection Internal diagnostics are performed at both levels of operation and any error conditions detected are immediately indicated by the module s LEDs and status to the SLC processor At module power up a series of internal diagnostic self tests is performed The module status LED and all channel status LEDs remain off during powerup If any diagnostic test fails the...

Page 101: ...EL RTD resistance STATUS Table 7 A explains the function of the channel status LEDs while the module status LED is turned on Table 7 A LED Status Description If Module Status LED is And Channel Status LED is Indicated Condition Corrective Action On Channel Enabled No action required Blinking Broken Input Condition open circuit for RTD or resistance input and short circuit for RTD inputs only To de...

Page 102: ...n word S 6 of the SLC processor status file The format for the error codes in the status word S 6 is shown in Figure 7 2 The characters denoted as XX in Figure 7 2 represent the slot number Hex for the module The characters denoted as YY represent the 2 digit hex code for the fault condition The error codes applicable to the RTD Module range from 50H to 5AH These are non recoverable errors For a d...

Page 103: ...lect bits 6 and 7 are set to 11 which is invalid Scaling select bits 13 and 14 are set to 01 or 10 and scaling limit words 0 Data format bits are set to 11 proportional counts the scaling select bits are set to 01 or 10 and the lower limit user set scale word is greater than or equal to the upper limit user set scale word Open and Short Circuit Detection An open or short circuit test is performed ...

Page 104: ...auses of an out of range condition include The temperature is too hot or too cold for the RTD being used Wrong RTD used for type configuration selected Bad potentiometer or RTD Signal input from either potentiometer or RTD is beyond the user set scaling range Module Status LED Green The module status LED is used to indicate module related diagnostic or operating errors These non recoverable errors...

Page 105: ...ule fault condition Normal module operation Channel is not enabled Channel is enabled and working properly Is problem Check to see that module is seated properly in chassis Cycle power corrected Contact your local distributor or Allen Bradley Yes No Check channel status word bits 13 15 Bit 13 set 1 Bit 14 set 1 Bit 15 set 1 Enable channel if desired by setting channel config word bit 11 1 Retry En...

Page 106: ...ing information available when you call a clear statement of the problem including a description of what the system is actually doing Note and record the LED states also note input and output image words for the RTD module a list of things you have already tried to remedy the problem processor type 1746 NR4 series letter and firmware FRN number See label on left side of processor hardware types in...

Page 107: ...Chapter 7 Module Diagnostics and Troubleshooting 7 8 Notes AB Spares ...

Page 108: ...ect whether the displayed RTD input data for any channel is expressed in C or F Use the worksheet in Figure 8 2 Figure 8 1 indicates the temperature of a bath on an LED display The display requires binary coded decimal BCD data so the program must convert the temperature reading from the RTD module to BCD before sending it to the display This application displays the temperature in F Figure 8 1 De...

Page 109: ... units x1 01 engineering units x10 10 scaled for PID 0 to 16383 11 proportional counts 32768 to 32767 Bits 6 and 7 Broken Input Select 00 zero 01 upscale 10 downscale 11 lnvalid Bit 8 Temperature Units Select 0 degrees Celsius 1 degrees Fahrenheit Bits 9 and 10 Filter Frequency Select 00 10 Hz 01 50 Hz 10 60 Hz 11 250 Hz Bit 11 Channel Enable 0 channel disabled 1 channel enabled Bit 12 Excitation ...

Page 110: ...ce N10 0 Dest O 3 0 Initialize Channel 0 of RTD Module MOV Rung 2 1 Convert the channel 0 data word degrees F to BCD values and write this to the LED display If channel 0 is ever disabled a zero is written to the display TO BCD Source I 3 0 Dest N7 0 TOD MASKED MOVE Source N7 0 Mask 0FFF Dest O 2 0 MVM The use of the masked move instruction with the 0FFF mask allows you to use outputs 12 13 14 and...

Page 111: ...play with the last digit representing tenths of a degree The displays have DC sinking inputs and use a BCD data format Figure 8 4 Device Configuration for Displaying Many RTD Outputs 4 1746 OB16 1746 IB8 Ambient Temperature 604 Ω Nickel Iron 518 SLC 5 04 1746 NR4 Chilled H2O Pipe In Steam Pipe In Bath 200 Ω Platinum RTD 385 Chilled H2O Pipe Out Steam Pipe Out Bath Display Panel C F Selector Switch...

Page 112: ...en or short circuit 60 Hz input filter to provide 60 Hz line noise rejection use 2 0 mA excitation current for RTD select module defined scaling Configuration setup for steam RTD channel 2 1000 Ω Platinum RTD 385 display temperature to tenths of a degree Celsius zero data word in the event of an open or short circuit 60 Hz input filter to provide 60 Hz line noise rejection use 0 5 mA excitation cu...

Page 113: ...tiometer Bits 4 and 5 Data Format Select 00 engineering units x1 01 engineering units x10 10 scaled for PID 0 to 16383 11 proportional counts 32768 to 32767 Bits 6 and 7 Broken Input Select 00 zero 01 upscale 10 downscale 11 Invalid Bit 8 Temperature Units Select 0 degrees Celsius 1 degrees Fahrenheit Bits 9 and 10 Filter Frequency Select 00 10 Hz 01 50 Hz 10 60 Hz 11 250 Hz Bit 11 Channel Enable ...

Page 114: ...Channel F C 0 N10 0 N10 4 1 N10 1 N10 5 2 N10 2 N10 6 3 N10 3 N10 7 2 When the position of the degrees selector switch changes write the appropriate channel configuration to the RTD module Note that the use of the OSR instruction one shot rising makes these configuration changes edge triggered that is the RTD is reconfigured only when the selector switch changes position C F Degrees Selector Switc...

Page 115: ... up all four channels to read in degrees Fahrenheit OSR B3 0 Configure RTD Module Channels COP COPY FILE Source N10 0 Dest O 1 0 Length 4 0 Rung 2 1 Degrees Selector Switch Celsius I 2 0 If the degrees selector switch is turned to the Celsius position set up all four channels to read in degrees Celsius OSR B3 1 Configure RTD Module Channels COP COPY FILE Source N10 4 Dest O 1 0 Length 4 Rung 2 2 T...

Page 116: ...Source I 1 3 Dest O 6 0 Write RTD Module Chilled Temperature to Display TOD Rung 2 6 END Data Table address 15 data 0 address 15 data 0 N10 0 0000 1101 0000 1011 N10 5 0000 1100 0000 0001 N10 1 0000 1101 0000 0001 N10 6 0001 1100 0000 0011 N10 2 0001 1101 0000 0011 N10 7 0000 1100 0000 0001 N10 3 0000 1101 0000 0001 N10 4 0000 1100 0000 1011 ...

Page 117: ...Chapter 8 Application Examples 8 10 Notes AB Spares ...

Page 118: ...lter frequencies Maximum common mode voltage 1 volt Maximum allowed permanent overload Volts 5V dc Current 5 mA Input Filter Cut Off Frequencies 2 62 Hz at 10 Hz filter frequency 13 1 Hz at 50 Hz filter frequency 15 72 Hz at 60 Hz filter frequency 65 5 Hz at 250 Hz filter frequency Calibration Module autocalibrates when a channel is enabled or when a change is made to its input type filter frequen...

Page 119: ...See Chapter 4 Update Time page 4 10 Channel Turn On Time Requires up to one module update time plus one of the following S 250 Hz Filter 388 milliseconds S 60 Hz Filter 1 300 milliseconds S 50 Hz Filter 1 540 milliseconds S 10 Hz Filter 7 300 milliseconds Channel Turn Off Time Requires up to one module update time refer to page 4 11 Reconfiguration Time Requires up to one module update time plus o...

Page 120: ... 328 F to 446 F 0 1 C 0 2 F 0 2 C 0 4 F Copper 426 10W Not allowed 100 C to 260 C 148 F to 500 F 0 1 C 0 2 F 0 2 C 0 4 F Nickel 618 120W 100 C to 260 C 148 F to 500 F 100 C to 260 C 148 F to 500 F 0 1 C 0 2 F 0 1 C 0 2 F Nickel 672 120W 80 C to 260 C 112 F to 500 F 80 C to 260 C 112 F to 500 F 0 1 C 0 2 F 0 1 C 0 2 F Nickel Iron 518 604W 100 C to 200 C 148 F to 392 F 100 C to 200 C 148 F to 392 F ...

Page 121: ...nce change per ohm per C For instance Platinum 385 refers to a platinum RTD with α 0 00385 ohms ohm C or simply 0 00385 C The accuracy values assume that the module was calibrated within the specified temperature range of 0 C to 60 C 32 F to 140 F Actual value at 0 C is 9 042W per SAMA standard RC21 4 1966 Actual value at 0 C is 100W per DIN standard To maximize the relatively small RTD signal onl...

Page 122: ...4Ω at 2 0 mA The accuracy values assume that the module was calibrated within the specified temperature range of 0 C to 60 C 32 F to 140 F Cable Specifications Description Belden 9501 Belden 9533 Belden 83503 When used For 2 wire RTDs and potentiometers For 3 wire RTDs and potentiometers Short runs less than 100 feet and normal humidity levels For 3 wire RTDs and potentiometers Long runs greater t...

Page 123: ...Appendix A Specifications A 6 Notes AB Spares ...

Page 124: ...00518 X α is the temperature coefficient of resistance which is defined as the resistance change per ohm per C International Electrotechnical Commission Standard 751 1983 German Standard DIN 43760 1980 and DIN 43760 1987 U S Standard D100 Scientific Apparatus Makers Association Standard RC21 4 1966 Japanese Industrial Standard JIS C1604 1981 Japanese Standard JIS C1604 1989 Minco Type NA Nickel an...

Page 125: ...Appendix B RTD Standards B 2 Notes AB Spares ...

Page 126: ...a 0 00385 Platinum a 0 003916 Copper a 0 00426 Nickel a 0 00618 a 0 00672 Nickel Iron a 0 00518 Resistance Input Setting 100W 0000 100W 0100 10W 1000 120W 1001 604W 1011 150W 1100 Select In ut Ty 200W 0001 200W 0101 120W 1010 500W 1101 Input Type 500W 0010 500W 0110 1000W 1110 1000W 0011 1000W 0111 3000W 1111 Actual value at 0 C is 9 042W per SAMA standard RC21 4 1966 Actual value at 0 C is 100W p...

Page 127: ...ilter frequency for the channel and enter the 2 digit binary code in bit field 9 10 of the channel configuration word A smaller filter frequency increases the channel update time but also increases the noise rejection A larger filter frequency decreases the noise rejection but also decreases the channel update time Bits 9 and 10 Select Filter Frequency 00 10 Hz 01 50 Hz 10 60 Hz 11 250 Hz 6 If the...

Page 128: ...s range 0 or 6 and 7 defines range 1 Refer to chapter 5 Bits 13 and 14 Select Scaling 00 module defined scaling 01 configuration words 4 and 5 used for scaling range 0 10 configuration words 6 and 7 used for scaling range 1 11 not used invalid setting 9 Make sure a zero is in bit 15 This bit is not used 10 Build the channel configuration word for every channel that is being used on each RTD module...

Page 129: ...al counts 32768 to 32767 Bits 6 and 7 Broken Input Select 00 zero 01 upscale 10 downscale 11 invalid Bit 8 Temperature Units Select 0 degrees Celsius 1 degrees Fahrenheit Bits 9 and 10 Filter Frequency Select 00 10 Hz 01 50 Hz 10 60 Hz 11 250 Hz Bit 11 Channel Enable 0 channel disabled 1 channel enabled Bit 12 Excitation Current Select 0 2 0 mA 1 0 5 mA Bits 13 and 14 Scaling Select 00 module defi...

Page 130: ...uration error 7 4 bit description in status word 5 23 definition P 4 filter frequency 4 3 effects on noise filtering 4 3 effects on update time 4 3 channel status bit 5 22 bit description in status word 5 22 channel timing channel scan time 4 9 channel update time 4 9 chassis P 4 CMRR P 4 common mode rejection ratio P 4 common mode voltage P 4 compatibility 1 3 with RTD sensors 1 3 with SLC contro...

Page 131: ...figuration changes 6 5 excitation current P 4 5 22 A 3 bit description in status word 5 22 definition P 4 specifications A 3 European Union Directives Compliance 3 1 F filter frequency P 5 bit description in configuration word 5 13 bit description in status word 5 21 full scale error P 5 full scale range P 5 G gain drift P 5 gain error P 5 See also full scale error getting started See quick start ...

Page 132: ...ot interconnection 3 10 3 11 3 wire pot interconnection 3 10 3 11 accuracy 1 5 A 5 ohmic values 1 5 A 5 repeatability 1 5 A 5 resolution 1 5 A 5 wiring diagram 3 10 3 11 wiring inputs 3 9 3 12 power requirements 3 2 power up sequence 1 8 programming 6 1 alarms 6 10 6 11 application examples 8 1 configuration settings 6 2 initial setting 6 2 making changes 6 4 PID instruction 6 7 proportional count...

Page 133: ... for RTDs B 1 start up instructions 2 1 status word P 6 5 19 See also input image step response P 6 4 4 system operation 1 8 T temperature units 5 12 bit description in configuration word 5 12 bit description in status word 5 21 terminal pinout diagram 3 6 terminal wiring 3 6 terms P 4 tools required for installation 2 1 torque 3 7 terminal block screws 3 7 troubleshooting 7 1 contacting Allen Bra...

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