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Spectrum 1746sc-CTR4 Owner'S Manual Download Page 47

Chapter 5: Ladder Program Examples

47

Rate Limit Flag = 10,000Hz * 2 = 20,000Hz

Application:

Meter Proving

The 1746sc-CTR4/8 module provides a feature that allows the user to
perform meter proving functions.  A typical meter proving application
would include two detector sensors that are located a fixed distance from
each other within a section of pipe used specifically for meter proving.
The operation does not disrupt the in situ flowmeter’s operation.

Detector #1

Detector #2

Displacer

Utilizing the external gate enable to start and stop count functions enables
the user to count pulses as fast as 20 microseconds to an accuracy of 1
count.

Here is an example wave form representing the start and stop transitions
on the external gate enable, and the associated pulses that the module
would accumulate:

Flow Meter Input

External Channel Enable

1

2

3 

4 

NA

Given the above wave form, the module will begin counting the first
positive going input pulse after the external enable input goes low.  The
module will accumulate 4 counts in the channel count register and stop
when the external enable input goes high.

Summary of Contents for 1746sc-CTR4

Page 1: ...SLC 500 50 KHZ COUNTER FLOWMETER INPUT MODULE Catalog Numbers 1746sc CTR4 1746sc CTR8 Owner sGuide 0300181 06 Rev H ...

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Page 3: ...tent liability is assumed by Spectrum Controls with respect to the use of any of the information products circuits programming or services referenced herein The information in this owner s guide is subject to change without notice LimitedWarranty Spectrum Controls warrants that its products are free from defects in material and workmanship under normal use and service as described in Spectrum Cont...

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Page 5: ...3 Inserting Your Module Into The Rack 14 Wiring Your Module 15 Terminal Block Wiring 17 Labeling And Re Installing The Terminal Block if it is removed 18 Things To Consider Before Using Your Module 19 Module ID Code 19 Table 3 1 Module ID codes 19 Module Addressing 20 Figure 3 1 20 Operating Modes 22 Table 3 2 Module operating modes 22 Input Configurations 22 Gate Modes 24 Channel Turn On Turn Off...

Page 6: ...t and Rate Outputs 46 Application Meter Proving 47 Application Note Factor Data Errors 48 Testing Your Module 51 Inspecting Your Module 51 Disconnecting Prime Movers 52 Powering Up 52 Interpreting The LED Indicators 53 Figure 6 1 LED block 53 Operation 53 Table 6 1 Channel Status LED Blink Codes 53 Codes 54 No Signal 54 Troubleshooting 55 Figure 6 2 Problem resolution flowchart 55 Maintaining Your...

Page 7: ...ut will count AC zero crossing signals from 50 mV to 75 V peak Read this chapter to familiarize yourself with your counter module This chapter covers General features and benefits Detailed specifications General Features And Benefits 8 Input Channels or 4 Channels of Quadrature Encoders 4 External Counter enable inputs Input voltage ranges AC 50mv 75V peak 5 Vdc 12 Vdc 24 Vdc Input frequency AC 50...

Page 8: ...de high resolution user programmable range settings continuous temperature compensation no field calibration software configuration programmable output limits and programmable safe states in case of a fault Detailed Specifications Table 1 1 Electrical specifications module Specification Specification Specification Specification Specification Description Configuration 4 8 Channel of differential co...

Page 9: ...d Disable setup time 20us Channel Update Time Counter Output Scaling OFF ON 4 0 5 6 msec per channel Rate Output Rate Instantaneous Mode 4 0 5 6 msec per channel Rate Average Mode 1 0 1 0 sec per channel Accuracy Count mode 1 Count Rate Instant 1 50KHz 001 1Hz Rate Average 1Hz Maximum Count Value Low Range 32 768 to 32 767 High Range 8 388 608 to 8 388 607 Fault detection Over under range status b...

Page 10: ...ule Status LED indicates the status of the power up self test The LED is on when the module is ready Any self test error is indicated with a blink code Channel Status CTR4 4 Green LEDs CTR8 8 Green LEDs The 8 Channel LED s indicates that a channel is enabled Terminal Block 24 pin removable connector Wire Size One 12 AWG to 28 AWG wires Torque 5nm 4 5 lb in Table 1 3 Environmental specifications Te...

Page 11: ...cordance with Class I Division 2 wiring methods Article 501 4 b of the National Electrical Code NFPA 70 and in accordance with the authority having jurisdiction Also you must observe the warnings shown below Failure to observe these warnings can cause personal injury WARNING EXPLOSIONHAZARD Substitutionofcomponentsmayimpairsuitabilityfor ClassI Division2 Wheninhazardouslocations turnoffpowerbefore...

Page 12: ... Noise Reduction Techniques in Electronic Systems by Henry W Ott published by Wiley Interscience of New York in 1976 AvoidingElectrostatic Damage Guard against electrostatic damage by observing the following precautions CAUTION ELECTROSTATICALLYSENSITIVECOMPONENTS Beforehandlingthemodule touchagroundedobjectto ridyourselfofelectrostaticcharge Whenhandlingthemodule wearanapprovedwriststrap groundin...

Page 13: ...system Installation and Operation Manual SelectingaRackSlot Two factors determine where you should install your module in the rack ambient temperature and electrical noise When selecting a slot for your module try to position your module in a rack close to the bottom of the enclosure where the air is cooler away from modules that generate significant heat such as 32 point input output modules in a...

Page 14: ...ng your module into the rack you do not need to remove the supplied 36 position terminal block from the module If however you do remove the terminal block use the write on label to identify your module s location To remove the terminal block unscrew the two retaining screws at the top and bottom of the terminal block and using a screwdriver or needle nose pliers carefully pry the terminal block lo...

Page 15: ...tothemodule Failure to observe this precaution can cause unintended equipment operation and damage Before wiring the terminal block take some time to plan your system Ensure that the SLC 500 system is installed in a NEMA rated enclosure and that the SLC 500 system is properly grounded Route the field wiring away from any other wiring and as far as possible from sources of electrical noise such as ...

Page 16: ...pose the end of each wire 4 At one end of the cable twist the drain wire and foil shield together bend them away from the cable and apply shrink wrap 5 At the other end of the cable cut the drain wire and foil shield back to the cable and apply shrink wrap Insulation Clear Wire Black Wire Foil Shield and Drain Wire 6 Connect the wires to the terminal block and field device as shown in the followin...

Page 17: ...channel on your module A system may malfunction due to a change in its operating environment After installing and wiring your module check system operation See the Allen Bradley system Installation and Operation Manual for more information Terminal Block Wiring Note Channels 4 7 are only available on the 1746sc CTR8 module Note A pull up resistor may be necessary for open collector inputs Refer to...

Page 18: ... the terminal block is wired correctly for the module Once you have wired your module and properly labeled install the terminal block on your module 1 Align the terminal block with the receptacle 2 Insert the terminal block and press firmly at the top and bottom until it is properly seated 3 Screw in the two retaining screws on the top and bottom of the terminal block ...

Page 19: ...hannel turn on turn off reconfiguration timing response to slot disabling Module ID Code Before using your module you must configure the slot your module is in by entering the module s ID code in APS or RS Logix Enter your module s ID code select other from the list of modules on the APS or RS Logix system I O configuration display and enter your module s ID code at the prompt The module ID code f...

Page 20: ... Word Channel 7 Preset M Factor Channel 7 Limit K Factor Channel 7 Rate Lim R Factor Channel 0 Output Low MSW Channel 0 Output High LSW Channel 0 Frequency Channel 0 Status Word Bit 0 Address Word 29 I e 29 Word 30 I e 30 Word 31 I e 31 Word 0 I e 0 Word 1 I e 1 Word 2 I e 2 Bit 15 Word 3 I e 3 Word 28 I e 28 Channel 7 Output Low MSW Channel 7 Output High LSW Channel 7 Frequency Channel 7 Status W...

Page 21: ...ration word Each word has a unique address based on the slot number assigned to the module Example Address If you want to configure the second channel on the module located in slot 4 in the SLC chassis your address would be O 4 4 O 4 2 File type Slot Word Element Delimiter Word Delimiter Chapter 4 Channel Configuration Data and Status gives you detailed bit information about the data content of th...

Page 22: ...s based on operating mode Uni Directional With this configuration the input increments in an upward direction All 8 channels may be configured in the unidirectional mode Every clock pulse will increment the counter on the rising edge Note The direction of the counter may be inverted by setting the Count Direction bit described in the Configuration chapter Bi Directional The bidirectional counter r...

Page 23: ... changes value on the rising and falling edges of inputs A and B The counter increments four times per quadrature cycle Note In the X4 Quadrature mode invalid signals are not detected A broken input wire jitter or noise on the input can cause additional counts to be registered The modules response to four possible error conditions are listed below Input A is active while input B is stuck high Modu...

Page 24: ...the state of the counters start stop bit They do not indicate that state of the external hardware gate Counter Start Stop Bit This bit allows the counter to continue to count up or down from its present value Starting or enabling this bit wil not override the external counter input Channel Turn On Turn Off and Reconfiguration Times The time required for the module to recognize a new configuration ...

Page 25: ...s appearing in the processor table is not read When the processor re enables the module slot the current state of the module inputs are read by the processor during the subsequent scan Output response The SLC processor may change the counter module output data configuration as it appears in the processor output image However this data is not transferred to the counter module The outputs are held i...

Page 26: ...26 SLC500 50KHzCounter FlowmeterInputModule ...

Page 27: ...The Data Register format uses Class 3 operation Class 3 mode allows the module to use 32 input words and 32 output words of data as listed below After installing your module you must configure each channel by setting bit values in each configuration word Output words 0 through 31 of the output image file addresses O e 0 O e 31 configure channels 0 7 respectively and addresses O e 0 O e 15 for chan...

Page 28: ... Limit R Factor O e 19 Channel 4 Limit K Factor O e 18 Channel 4 Preset M Factor O e 17 Channel 4 Configuration Word O e 16 Channel 5 Rate Limit R Factor O e 23 Channel 5 Limit K Factor O e 22 Channel 5 Preset M Factor O e 21 Channel 5 Configuration Word O e 20 Channel 6 Rate Limit R Factor O e 27 Channel 6 Limit K Factor O e 26 Channel 6 Preset M Factor O e 25 Channel 6 Configuration Word O e 24 ...

Page 29: ... override the external counter enable input The external input enable and the counter start bit must both be enabled for the counter to continue counting If either the counter stop bit or the external input enable line are disabled the counter will hold it s last value and stop counting Counter Preset Configuration Bit 1 When this bit is set the value in counter preset word is loaded into the coun...

Page 30: ...mit is set to a non zero value User defined limit these flags are will remain high until reset Count is equal to zero or counter decremented down through zero flag Status word bit 8 Count up or down through the limit flag Status word bit 6 And these flags do not remain high Maximum count flag Status word bit 5 is set if count value is exactly equal to 32 767 16 bit or 8 388 607 24 bit Otherwise it...

Page 31: ... Hertz vs Frequency Frequency Error 50 0 50 100 150 200 250 0 10 000 20 000 30 000 40 000 50 000 60 000 Frequency E r r o r Frequency Error Frequency Error Input Rate Error in Hz Instant Rate Mode Error Input Range Configuration Bits 4 5 This group of 2 bits selects one of 4 input ranges Each range is selected for a given system voltage level Each range has its own counter trip level Refer to the ...

Page 32: ...ls within a pair must be configured for quadrature mode Quadrature encoding will report the same quadrature count value on each channel s output Quadrature mode allows for the channels to count up or down depending on the quadrature encoding direction The COUNT DIRECTION bit can invert the direction of the quadrature encoding The QUAD X1 mode clocks the counter once every quadrature cycle The QUAD...

Page 33: ...ximum value of 32 767 is reached the Maximum Count flag is set and rollover will occur at this point When the count size is extended to 8 388 607 by setting this bit to 1 the Counters Maximum flag is extended to 8M and data output is formed using two words The counter Preset and Limit values are also extended to 8M This means that the resolution of the Preset and Limit values are set in blocks of ...

Page 34: ... and Limit Data Values When using the Counter Preset Counter Limit Rate Limit or K M R Factors you must input the value that is appropriate for your application The values follow each channels configuration word and use the next three configuration words For example Channel 0 has a configuration word address of O e 0 Preset address of O e 1 a Counter Limit address of O e 2 and a Rate Limit address...

Page 35: ... counts 8bits This allows the preset and limit values to cover the whole 8M bit range Refer to the applications section of this manual for more information about setting limit and scale values Counter Limit K Factor The counter limit mode is used in Normal operation mode This input data word is used in conjunction with the Scale Limit Mode enable bit When the counter limit bit is set the counter l...

Page 36: ...an R Factor is stored in the module s non volatile memory If an R Factor is defined not zero then the data value output for the counter value will be Rate R Factor A zero value must be written to the R Factor to disable this feature Figure 4 8 Rate Limit R Factor Word 15 0 Address Rate Limit R Factor O e z Refer to the applications section of the manual for limit and scale examples Floating Point ...

Page 37: ...3 n a 5 Channel MSW LSW Rate Data Status Reg I e 24 to I e 27 n a 6 Channel MSW LSW Rate Data Status Reg I e 28 to I e 31 n a 7 Channel MSW LSW Rate Data Status Reg Figure 4 9 Data Words 8 9 I e w I e x I e y I e z Rate Output Counter MSW Counter LSW Status Output Counter Data High word This input data register contains the upper word of the counters accumulator This register is a 16 bit word in b...

Page 38: ...the high word represents counts that carry over 1000 When the counter is configured in Extended mode Actual count Value of the high word x 1000 Value of the low word Figure 4 11 Counter Low Word 8 9 Counter Input Low I e 1 Rate Register word Refer to Appendix A for floating point rate mode This input data register contains the rate value while operating in rate mode This register is a 16 bit word ...

Page 39: ...l 6 Status Word I e 27 Channel 7 Status Word I e 31 0 OK 1 Error Count Preset Count Limit Count Max Count Size Direction Invert Count Direction Counter Input State Counter Enable System Error Configuration Error Rate Limit R Factor K or M Factor Rate Zero Rate Limit Rate Max Count Zero 0 Reset 1 Set 0 Zero 1 Set 0 Reset 1 Set 0 Reset 1 Set 0 Zero 1 Set 0 OK 1 Error 0 Reset 1 Set 0 Reset 1 Set 0 Re...

Page 40: ...r this indicator is to provide quadrature detection feedback to aid in system diagnosis Count Direction Invert Bit echo Status Bit 3 This bit echo s the state of the Count Direction bit set in the channel configuration register The count direction status echo s the state of the invert bit It does not determine if the count is going up or down Count Size Selection echo Status Bit 4 This bit echo s ...

Page 41: ...he rate zero flag is set when no input is detected for 2 seconds K Factor M Factor Set Flag Configuration Bit 12 This bit indicates that a non zero K or M factor value has been written to the module s non volatile memory This value will be use to scale the input counter data When a K or M factor is set all count data will be scaled by the K or M factor data R Factor Set Flag Configuration Bit 13 T...

Page 42: ...42 SLC500 50KHzCounter FlowmeterModule ...

Page 43: ...ing with these configuration settings Channel 0 Output Register Configuration O e 0 Output Register Configuration Config Bit Description Bit Setting Description 15 Normal 0 Normal Mode 14 Roll Under 0 Roll to Neg s 13 Roll Over 0 Roll to Zero 12 Direction 0 Default No Inversion 11 Count Size 0 Default 32K Std 10 Freq Filter 0 Default 50kHz 9 Stop on Limit 0 Default No Stop 8 Stop on Zero 0 Default...

Page 44: ...counter counts in a downward direction It will start at 0 and count to 32 768 It will then Roll Under to 32 767 If Configuration Bit 14 is set the counter will Roll Under to this Preset Value Ring Counter Sample The figure below demonstrates a ring counter operation In a ring counter operation the count value changes between zero and maximum If when counting up the counter reaches the maximum valu...

Page 45: ...n 15 Normal 0 Normal Mode 14 Roll Under 1 Preset 13 Roll Over 0 Roll to Zero 12 Direction 0 Default No Inversion 11 Count Size 0 Default 32K 10 Freq Filter 0 Default 50kHz 9 Stop on Limit 0 No Stop 8 Stop on Zero 0 Default N A 6 7 Count Mode 00 Default Uni Directional 4 5 Input Range 00 Default 50mV 30VAC 3 Rate Mode 0 Default Instant 2 Reset Flags 0 Default Toggle each Rev 1 Counter Preset 0 Defa...

Page 46: ... 256 000 1000x256 LimitValue 100 2560 100x256 Using Scaling with Count and Rate Outputs Count Output Counter output scaling is applied using the K M scale factors When a scale factor is applied to the counter the Counter Output Register Raw Count M factor 10000 1 K Factor When a scale factor is being used the Preset and Limit flags are also scaled Rate Output Rate output scaling is applied using t...

Page 47: ...tector 1 Detector 2 Displacer Utilizing the external gate enable to start and stop count functions enables the user to count pulses as fast as 20 microseconds to an accuracy of 1 count Here is an example wave form representing the start and stop transitions on the external gate enable and the associated pulses that the module would accumulate Flow Meter Input External Channel Enable 1 2 3 4 NA Giv...

Page 48: ...limit values If factored data values are inadvertently loaded into the module without user knowledge of this occurring the module can appear to be non functional Follow these steps to identify if factored data values have been loaded and if so how to clear those values to return the module to default operation Use Channel Status registers to identify the presence of Factored Data values Use Bits 1...

Page 49: ...onfiguration register must be toggled from 0 to 1 and then back to 0 There are 4 registers assigned for each Channels output configuration word The first register assigned is the channel configuration register The next 3 registers are the Preset K Factor Limit M Factor and Limit R Factor registers respectively Refer to Page 24 for detailed information regarding the output configuration registers a...

Page 50: ...50 SLC500 50KHzCounter FlowmeterModule ...

Page 51: ...nt many potential problems by simply inspecting your analog module 1 Ensure that all wire connections are correct and secure and that no wires are missing or broken CAUTION FIELDWIRINGERRORS Beforeenablingachannel throughyourladderprogram ensurethatyouhavechosenaproperinputrangeforyourinput signal Failure to observe this precaution can cause improper module operation or equipment damage 2 Ensure t...

Page 52: ...onnect the motor wires open the circuit at a point between the motor starter and the relay contact WARNING POSSIBLEUNEXPECTEDMACHINEMOTION Duringalltesting alwaysdisconnectalldevicesthat when energized mightcausemachinemotion Failure to observe this precaution can cause equipment damage or personal injury PoweringUp When you apply power to the system the module status LED should illuminate indicat...

Page 53: ... LEDs produce diagnostic blink codes when an error occurs If the Module Status LED produces a blink code please contact your local AB Representative or one of our technical support engineers The Channel Status LED error codes may be used to detect channel configuration errors T T T T Ta a a a ab b b b ble6 1 ChannelSta le6 1 ChannelSta le6 1 ChannelSta le6 1 ChannelSta le6 1 ChannelStatusLEDBlinkC...

Page 54: ...ference Manual Allen Bradley publication 1746 6 11 No Signal After reviewing your configuration and LEDs for errors you may want to check the input register Rate word for any indication of signal If status bit 1 Counter Input State is high and status bit 11 Rate Zero is high you may require a 1 to 10kΩ pull down resistor depending on the in put device between your channel input and channel common ...

Page 55: ...us LED s on Channel is not enabled Channel is enabled and working Enable channel if desired by setting channel config word bit 0 1 Retry End Fault condition Check channel status word bits 14 15 Fatal channel error such as a software power up failure due to corrupt hardware or malfunctioning software Try resetting the processor or cycling power to your module Bit 15 set 1 Non fatal channel error su...

Page 56: ...heck Input Range Setting Config Bits 4 5 Check External Enable Disconnect any wires to enable Reset K M Scale Factors Reset Flag Bit Config Reg Bit 2 Turn off Stop on Limit Stop on Zero Bits Frequency Mode is not working CheckFreqMax FlagStatus RegBit9 Reset F Scale Factor Reduce Input Frequency Check F Scaling Status Bit 13 CheckFreqZero FlagStatus RegBit11 Verfify Counter is counting faster than...

Page 57: ... the enclosure door closed Also regularly inspect the terminal connections for tightness Loose connections may cause a malfunctioning of the SLC system or damage to the components WARNING POSSIBLELOOSECONNECTIONS Beforeinspectingconnections alwaysensurethatincoming powerisOFF Failure to observe this precaution can cause personal injury and equipment damage SafetyConsiderations Safety is always the...

Page 58: ...gelectricalconnectionsorinputs outputscausing machinemotion Failure to observe these precautions can cause personal injury or equipment damage Safety Circuits Circuits installed on machinery for safety reasons like over travel limit switches stop push buttons and interlocks should always be hard wired to the master control relay These circuits should also be wired in series so that when any one ci...

Page 59: ...l decrease Configuring Each Input Channel for Floating Point Rate The Data Register format for floating point is different that the default register mode The data words have been moved to accommodate the floating point rate value Your ladder logic must be modified to support this new word format In order to activate the floating point mode you must set the Rate Factor to a value of 1 The following...

Page 60: ...gh RateDataLow StatusReg I e 8toI e 11 I e 8toI e 11 2ChannelLSW RateDataHigh RateDataLow StatusReg I e 12toI e 15 I e 12toI e 15 3ChannelLSW RateDataHigh RateDataLow StatusReg I e 16toI e 19 n a 4ChannelLSW RateDataHigh RateDataLow StatusReg I e 20toI e 23 n a 5ChannelLSW RateDataHigh RateDataLow StatusReg I e 24toI e 27 n a 6ChannelLSW RateDataHigh RateDataLow StatusReg I e 28toI e 31 n a 7Chann...

Page 61: ...in binary 2 s complement format and will allow count values up to 32K This word is used in conjunction with the counter s upper output word when in the extended count mode Bit 15 represents the sign for each word Note Extended count mode is not a valid configuration when using the floating point rate mode Figure 4 10 Counter Low Word 8 9 Counter Input Low I e 1 Rate Register words These two input ...

Page 62: ...status Status remains the same as other modes Information may be found in Chapter 4 Ladder Logic In order to create the floating point value it necessary to join the high and low rate data words This is accomplished using the following ladder logic ...

Page 63: ...AppendixA FloatingPointRateMode 63 ...

Page 64: ...64 SLC500 50KHzCounter FlowmeterModule ...

Page 65: ... the unlikely event that the module should need to be returned to Spectrum Controls please ensure that the unit is enclosed in approved ESD packaging such as static shielding metallized bag or black conductive container Spectrum Controls reserves the right to void the warranty on any unit that is improperly packaged for shipment For further information or assistance please contact your local distr...

Page 66: ...s Inc All rights reserved Printed in U S A Specifications subject to change without notice Publication 0300181 06 Rev H February 2007 U S A Headquarters SpectrumControlsInc P O Box5533 Bellevue WA 98006 Fax 425 641 9473 Tel 425 746 9481 Web Site http www spectrumcontrols com E mail spectrum spectrumcontrols com ...

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