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C T I 2550-A Installation and O peration G uide

1.7 Analog to Digital Conversion

1.7.1 Unipolar Mode Conversion

The following equations may be used to calculate the digital word which will result from a particular
voltage or current input in the Unipolar input Mode:

Input voltage (V) x 32000

0 to 5V Input Range Mode, Digital Word (WX)=

---------------------------------

5 volts

Input voltage (V) x 32000

0 to 10V Input Range Mode, Digital Word (WX)=

---------------------------------

10 volts

Input current (mA) x 32000

0 to 20mA Input Range Mode, Digital Word (WX)=

-----------------------------------

20 mA

1.7.2 Bipolar Mode Conversion

The following equations may be used to calculate the digital word which will result from a particular
voltage or current input in the Bipolar Input Mode:

± Input voltage (V) x 32000

-5 to +5V Input Range Mode, Digital Word (WX)=

-----------------------------------

5 volts

± Input voltage (V) x 32000

-10 to +10V Input Range Mode, Digital Word (WX)=

-----------------------------------

10 volts

±

Input current (mA) x 32000

-20 to +20 mA Input Range Mode, Digital Word (WX)=

------------------------------------

20 mA

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Содержание 2550-A

Страница 1: ...2550 A EIGHT CHANNEL ISOLATED ANALOG INPUT MODULE INSTALLATION AND OPERATION GUIDE Ver 2 2 CTI Part 062 00197 022 062 00197 022 2550 AIOG 092005 25 ...

Страница 2: ...ii CTI 2550 A Installation and Operation Guide ...

Страница 3: ... or registered trademarks of their respective holders DOCUMENT DISCLAIMER STATEMENT Every effort has been made to ensure the accuracy of this document however errors do occasionally occur CTI provides this document on an as is basis and assumes no responsibility for direct or consequential damages resulting from the use of this document This document is provided without express or implied warranty...

Страница 4: ...iv CTI 2550 A Installation and Operation Guide ...

Страница 5: ...e for SIMATIC 505 programmable controllers We assume you are familiar with the operation of SIMATIC 505 series programmable controllers Refer to the appropriate SIMATIC user documentation for specific information on the SIMATIC 505 programmable controllers and I O modules This Installation and Operation Guide is organized as follows Chapter 1 provides a description of the module Chapter 2 covers i...

Страница 6: ...vi CTI 2550 A Installation and Operation Guide ...

Страница 7: ...NOTE Notes alert the user to special features or procedures WARNING Warnings alert the user to procedures which could damage equipment and endanger the user CAUTION Cautions alert the user to procedures which could damage equipment USAGE CONVENTIONS ...

Страница 8: ...viii CTI 2550 A Installation and Operation Guide ...

Страница 9: ...f Range Input Signals 5 1 8 1 Unipolar Mode 6 1 8 2 Bipolar Mode 6 1 9 Using an Input with 20 Offset 8 1 9 1 Using the Module with 20 Offset 8 1 10 Resolution 9 CHAPTER 2 INSTALLATION 11 2 1 Planning the Installation 11 2 1 1 Calculating the I O Base Power Budget 11 2 1 2 Input Signal Wiring 11 2 2 Unpacking the Module 12 2 3 Configuring the Module 13 2 3 1 Selecting Voltage or Current Input Mode ...

Страница 10: ...ltage Input Wiring 18 2 5 2 Connecting Current Input Wiring 18 2 5 3 Connecting the Shield Wiring 18 2 6 Installing the Screw Terminal Connector 19 2 7 Checking Module Operation 20 CHAPTER 3 TROUBLESHOOTING 21 SPECIFICATIONS 23 JUMPER SETTINGS LOG SHEET 25 LIMITED PRODUCT WARRANTY 29 REPAIR POLICY 31 ...

Страница 11: ...ure 7 Voltage Input Limits Bipolar 6 Figure 8 Overrange Word Value Unipolar 7 Figure 9 Underrange Word Value Unipolar 7 Figure 10 Overrange Word Value Bipolar 7 Figure 11 Underrange Word Value Bipolar 8 Figure 12 Input Resolution 9 Figure 13 Factory Configuration Jumper Settings 14 Figure 14 Configuration Jumper Locations 15 Figure 16 Screw Terminal Connector Wiring 17 Figure 17 Shield Wire Termin...

Страница 12: ...xii CTI 2550 A Installation and Operation Guide ...

Страница 13: ...le with the SIMATIC 505 programmable controllers The Model 2550 A is designed to translate an analog input signal into an equivalent digital word which is then sent to the programmable controller PLC 1 1 Front Panel Description 1 1 1 Active LED The Active LED will be illuminated when the module is functioning normally If the Active LED is not lit or is blinking refer to Chapter 3 for troubleshooti...

Страница 14: ... of unipolar or bipolaar mode is made via an internal jumper see Section 2 3 3 1 5 Voltage or Current Mode Each of the module s eight channels may be configured to receive either voltage or current analog input signals For unipolar input signals the range is 0 to 5 VDC 0 to 10 VDC or 0 to 20 mA For bipolar input signals the signal range is 5 to 5 VDC 10 to 10 VDC or 20 to 20 mA Selection of voltag...

Страница 15: ...Figure 4 Word Input to the PLC from the Module Bipolar As shown in the following figure for a bipolar word input of the five bits not used for the digital word one is used to show the sign of the word one is used to note values which are overrange and the remaining bits are not used and are set to zero ...

Страница 16: ...tage V x 32000 0 to 10V Input Range Mode Digital Word WX 10 volts Input current mA x 32000 0 to 20mA Input Range Mode Digital Word WX 20 mA 1 7 2 Bipolar Mode Conversion The following equations may be used to calculate the digital word which will result from a particular voltage or current input in the Bipolar Input Mode Input voltage V x 32000 5 to 5V Input Range Mode Digital Word WX 5 volts Inpu...

Страница 17: ...as reached individual limits The value of the overrange or underrange condition varies from channel to channel The reason for this is that as a channel is calibrated all of the gains and offsets and dynamic ranges of the analog to digital converter of the system are compensated for in each analog input channel Therefore the point at which the analog to digital converter reaches a saturation point ...

Страница 18: ...rd may approach zero as the analog input signal approaches the minimum given range the digital word will never actually be zero In fact the underrange capability of any channel in Unipolar Mode may produce a negative value to the PLC for a number of counts before the underrange bit is set 1 8 2 Bipolar Mode In Bipolar Mode signals above or below the upper and lower limits in the 5 to 5VDC or 10 to...

Страница 19: ...Figure 9 Underrange Word Value Unipolar Figure 10 Overrange Word Value Bipolar Figures 8 and 9 show the binary values of typical overrange and underrange conditions for Unipolar mode Figures 10 and 11 show the binary values of typical overrange and underrange conditions for Bipolar Mode ...

Страница 20: ...program First subtract 6400 from the input data word WX Then multiply the result by 125 and divide the product by 100 This yields the following equation WX 6400 x 125 100 20 offset data word Consult your PLC programming manual or program design guide for information about RLL instructions used in the conversion 1 9 1 Using the Module with 20 Offset If all 8 inputs are used in offset mode the Model...

Страница 21: ...olar Mode the resolution is 16 counts out of 32000 so that the smallest unit into which the module will divide an input is 1 part out of 2000 This relationship can be shown as 16 counts per step 32000 counts full scale 1 2000 When using the module with 20 offset module resolution remains at 8 counts out of 32000 but offset resolution increases to 10 counts out of 32000 as a result of the multiplic...

Страница 22: ...10 CTI 2550 A Installation and Operation Guide ...

Страница 23: ...he installation of the module This involves calculating the I O base power budget and routing the input signal wiring to minimize noise The following sections discuss these important considerations 2 1 1 Calculating the I O Base Power Budget The Model 2550 A requires 5 2 watts of 5V power from the I O base Use this value to verify that the base power supply is not exceeded 2 1 2 Input Signal Wirin...

Страница 24: ...llowing general considerations when wiring the module Always use the shortest possible cables Avoid placing low voltage wire parallel to high energy wire if the two wires must meet cross them at a right angle Avoid bending the wire into sharp angles Use wireways for wire routing Avoid placing wires on any vibrating surface 2 2 Unpacking the Module Open the shipping carton and remove the special an...

Страница 25: ... 10V voltage range for each channel 3 Selecting unipolar or bipolar input mode for each channel 4 Selecting digital filtering or no filtering for the module 5 Selecting offset scaling for the module 6 Selecting 8WX or 16WX Advance Mode for the module Advanced Mode not supported in this release 7 Configuring DIP switches to report the hardware selections to the microcomputer 8 Logging the configura...

Страница 26: ...ut channels 1 through 8 see Figure 14 For each input channel operating in current mode set the corresponding Voltage Range Jumper to 5V For each input channel operating in voltage mode set the corresponding Voltage Range Jumper to 5V for 0 to 5V or 5 to 5V input range or 10V for 0 to 10V or 10 to 10V input range 2 3 3 Selecting Unipolar or Bipolar Input Mode Locate the Unipolar Bipolar Jumpers JP2...

Страница 27: ...ENABLE position Since many analog input signals contain noise CTI recommends using digital filtering unless maximum response time is required As shipped digital filtering is enabled for all 8 analog inputs 2 3 5 Selecting Offset Scaling Locate the SCALE jumper see Figure 14 To enable offset scaling for all 8 inputs set the jumper to the ENABLE position 2 3 6 Selecting Advanced Operating Mode Locat...

Страница 28: ...sert the module into the I O base by carefully pushing the module into the slot When the module is fully seated in the slot and backplane connector tighten the captive screws at the top and bottom to hold the module in place To remove the module from the I O base loosen the captive screws then remove the module from the I O base Be careful not to damage the edge card at the back of the module when...

Страница 29: ...llation and Operation Guide 17 Figure 16 Screw Terminal Connector Wiring To assign an input to a specific channel locate the appropriate channel position on the screw terminal connector as shown in the following figure ...

Страница 30: ...nly one end The other end should be left in an open circuit condition CTI recommends that the shield be terminated at the PLC end of the signal wire Special components are installed on the module to aid in the rejection of noise When entering the industrial cabinet the shield should be routed from the main terminal strip all the way to the PLC Signal leads that do not maintain a shield from the te...

Страница 31: ...Figure 17 Shield Wire Termination Figure 18 Input Connector Assembly 2 6 Installing the Screw Terminal Connector When all the input signal wires are connected to the screw terminal connector carefully install the connector on the front of the module ...

Страница 32: ... For information on viewing failed module status refer to your SIMATIC TISOFT user manual To diagnose and correct a module failure refer to the next section on troubleshooting You must also check that the module is configured in the memory of the PLC This is important because the module will appear to be functioning regardless of whether it is communicating with the PLC To view the PLC memory conf...

Страница 33: ...SHOOTING If the module provides improper readings or the status indicator is not on use the following chart to determine the appropriate corrective action When it is inconvenient to visually check the status indicator use the TISOFT Display Failed I O or Show PLC Diagnostics support functions If after consulting the chart above you are unable to diagnose or solve the problem contact your local dis...

Страница 34: ...22 CTI 2550 A Installation and Operation Guide ...

Страница 35: ... 0 2 of full scale from 0 to 60 C Resolution 8WX Mode Unipolar 12 bit plus sign 0 5VDC range 1 25mV step 0 10VDC range 2 5mV step 0 20mA range 10 A step Bipolar 11 bit plus sign 5 to 5VDC 2 5 mV step 10 to 10VDC range 5mV step 20 to 20mA range 10 A step Common Mode Range 150 VDC 130 VAC 50 60Hz Common Mode Rejection 140db 60Hz digital filtering disabled Normal Mode Rejection 40db 500 Hz Connector ...

Страница 36: ...le wide Backplane Power Consumption 5 2 Watts Operating Temperature 0 to 60 C 32 to 140 F Storage Temperature 40 to 85 C 40 to 185 F Humidity 5 to 95 noncondensing Agency Approvals UL UL for Canada FM Class 1 Div 2 CE Specifications subject to change without notice ...

Страница 37: ...550 A Installation and Operation Guide 25 Figure 21 Jumper Settings Log JUMPER SETTINGS LOG SHEET Record the configuration jumper settings on this log for future reference Make additional copies if necessary ...

Страница 38: ...26 CTI 2550 A Installation and Operation Guide ...

Страница 39: ...CTI 2550 A Installation and Operation Guide 27 USER NOTES ...

Страница 40: ...28 CTI 2550 A Installation and Operation Guide ...

Страница 41: ... specifications or damage caused by an accident disaster acts of God neglect abuse misuse transportation alterations attachments accessories supplies non CTI parts non CTI repairs or activities or to any damage whose proximate cause was utilities or utility like services or faulty installation or maintenance done by someone other than CTI Control Technology Inc reserves the right to make changes t...

Страница 42: ...30 CTI 2550 A Installation and Operation Guide ...

Страница 43: ...ent s shipping documentation Additionally if under warranty proof of purchase date and serial number must accompany the returned equipment The current repair and or exchange rates can be obtained by contacting CTI s main office at 1 800 537 8398 When returning any module to CTI follow proper static control precautions Keep the module away from polyethylene products polystyrene products and all oth...

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