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2502 2-Channel High Speed Counter Input Module

1. 9 Reserved 0 10 Reserved 0 11 Reserved 0 12 Reserved 0 13 Reserved 0 14 Reserved 0 15 Reserved 0 LSB 16 Reserved 0 Table 3 2 Module Setup Word Reset Command bit low to high transition of this bit acts as a one shot providing a momentary reset of the channel setting the count to 0 Even though the bit remains 1 counting resumes NOTE during each scan the controller reads the module WX words before updating WY words Therefore during a scan when the controller resets the module the WX word s contain counter values existing prior to the reset Inhibit Command bit channel stops counting when set to 1 16 CTI 2502 Installation and Operation Guide NOTE When in the pulse counter mode if the A or B input is in a different state at the beginning and end of an inhibit signal the count will change according to the normal counting logic If both A and B inputs are in different states the change may be as much as two counts Output level bit specifies when the outputs for each channel turn on 3 1 4 WY5 WY8 Counter Preset Words WY5 WY8 are used to specify preset values for each channel Presets can be any value between 0 and 65 535 WY5 Preset 1 Channel 1 WY6 Preset 2 Channel 1 WY7 Preset 1 Channel 2 WY8 Preset 2 Channel 2 CTI 2502 Installation and Operation Guide 17 CHAPTER 4 TROUBLESHOOTING Symptom Probable Cause Corrective Action
2. ACTIVE LED off or blinking Module diagnostic error Try re seating the module If the problem persists contact CTI Technical Support Input or Output LEDs dont light No power to board Re seat board Check for bent pins on board connector Check base power supply Problems with input signals Output being reset or inhibited Check wiring Check encoder or field inputs Check reset and inhibit inputs in WY4 Counts in wrong direction Connections wrong Reverse wiring for A amp B inputs Input wires substantially different lengths Wires should be as short as possible and the same length Incorrect count Connections wrong Trace wiring connections Input wires substantially different lengths Wires should be as short as possible and the same length Broken wire Check continuity Counts erratically Wrong quadrature mode or two jumpers on a single channel Check jumper position Signal wire noise See section 2 1 2 Broken wire Check continuity Does not count Count being reset or inhibited Check reset and inhibit signals from the field Check reset and inhibit bits in WY4 Broken wire Check continuity Counts too fast or too slow Pulse too narrow frequency too high Use lower gear ratio Check quadrature mode Check signal wire noise Controller does not communicate with module Module not confi
3. cccecceceeceeceeeeeeeceeeeeeaesaecaeseeeeaesaeseeseaeeaeeaeeeeseateaees 3 1 4 OPUS e tte ll La 4 O QUIPUIS tias 4 1 6 Counting MOJE Sas ainainen eaea uaaa rr een 5 1 6 1 Pulse Counter Mode 1 6 2 Quadrature Counter Mode CHAPTER 2 INSTALLATION as a ea ee 9 2 1 Planning the Installation Rees 9 2 1 1 Calculating the I O Base Power Budget 2 1 2 Input Signal Wiring 2 2 Unpacking the Module 10 2 3 Configuring the Module 11 2 3 1 Setting the Counter Mode 2 3 2 Setting the Reset Filtering Mode 2 4 Inserting the Module into the l O Base esseseeeeseneseseeresesrssrrsrssnsrssnsrsrnsrsrens 12 2 5 Wiring the WO Connector A 12 2 6 Adding the Module to the I O Configuration cc ccccceceeseeeeeeeeeeeeeeeeeeeeeeeeaeeaes 13 2 7 Module Programmminng ccecccscccscececececeeeeeeeeeseeeseeeseeeseeeeeesneesneeeeeesneesneeeneeeaes 15 2 7 1 Controller Input Output Words 2 7 2 WX1 Module Status Word 3 1 2 WX2 WX3 Current Count Values 3 1 3 WY4 Module Setup Word 3 1 4 WY5 WY8 Counter Preset Words CHAPTER 4 TROUBLESHOOTING nr ista 19 SPECIFICATION S ss ann ts ee 21 APPENDIX A COMPATIBILITY WITH SIEMENS 505 7002 23 APPENDIX B JUMPER SETTINGS LOG GHEET 25 LIMITED PRODUCT WARRANTY gege degen dE 27 REPAIR POLICY Vacunas aia dies 29 CTI 2502 Installation and Operation Guide 11 12 15 15 16 16 17 TABLE OF FIGURES Figure 2502 Front Paneli ma er reihen 2 Figure 1 2 Status LEDS sc A an eek nokia 3
4. if the two wires must meet cross them at a right angle e Avoid bending the wire into sharp angles e Use wireways for wire routing e Avoid placing wires on any vibrating surface CTI 2502 Installation and Operation Guide 9 2 2 Unpacking the Module Open the shipping carton and remove the special anti static bag which contains the module CAUTION HANDLING STATIC SENSITIVE DEVICES The components on the Model 2502 module printed circuit card can be damaged by static electricity discharge To prevent this damage the module is shipped in a special anti static bag Static control precautions should be followed when removing the module from the bag when opening the module and when handling the printed circuit card during configuration After discharging any static build up remove the module from the static bag Do not discard the static bag Always use this bag for protection against static damage when the module is not inserted into the I O backplane WARNING Ensure that the power supply is turned OFF before connecting the wires to the I O base 10 CTI 2502 Installation and Operation Guide 2 3 Configuring the Module The 2502 Two Channel High Speed Counter module requires several configuration steps prior to inserting it into the base and applying power Set counter mode on each channel Set reset filtering mode 2 3 1 Setting the Counter Mode The counter mode for each channel can be independently set using jum
5. Figure 1 3 Operation of Counter Output Circuits uuuussnnssssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnen 4 Table 1 1 Counting in Pulse Counter Mode ooocccccnccoccccccnnccccnnncnonnncnonnnnnnnnnnnnnncnnnnnnnnnnnnnnnnnnos 5 Figure 1 4 Counting in 1X Quadrature Mode AAA 6 Figure 1 5 Counting in 2X Quadrature Mode kk 6 Figure 1 6 Counting in 4X Quadrature Mode AAA 7 Figure 2 1 Configuring Module Jumpers 11 Figure 2 2 250210 Connector WI e E 13 Figure 2 3 Example I O Configuration Chart 14 Table 2 1 Module Status Word es ee it 15 Table 2 2 Module Setup Wooden Ri 16 Figure 3 1 Troubleshooting Matrix ocn are 19 CTI 2502 Installation and Operation Guide xi CHAPTER 1 OVERVIEW 1 0 Product Summary The CTI 2502 Two Channel High Speed Counter Input Module is a member of Control Technology s family of l O modules compatible with CTI 2500 Series and Simatic 505 programmable controllers It is designed to count pulses on the inputs and return the current count and status to the controller 1 1 Features The 2502 provides two independent high speed counter channels Each channel includes the following features e Four counter modes Pulse counter Quadrature counter modes 1X 2X 4X A 10 kHz count rate with a minimum pulse width of 25 s e Four inputs two count inputs reset inhibit e Two field outputs each controlled by a separate programmable preset LED indicators display the status of the A and B co
6. 210 Y Count up Count down Input A leads Input B leads Figure 1 6 Counting in 4X Quadrature Mode CTI 2502 Installation and Operation Guide CHAPTER 2 INSTALLATION The installation of the 2 Channel High Speed Counter Module involves the following steps Planning the installation Unpacking and configuring the module Inserting the module into the I O base Wiring and connecting the module I O connector Checking module operation AA WD gt The steps listed above are explained in detail in the following pages 2 1 Planning the Installation Planning is the first step in the 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 2502 requires 3 0 watts maximum of power from the I O base Use this value to verify that the base power supply is not exceeded 2 1 2 Input Signal Wiring Input signal wiring must be shielded twisted pair cable A twisted pair will aid in the rejection of conducted and radiated interference from other energy sources Standard practices usually require that all shields be tied together and grounded at a single point Note the following general considerations when wiring the module e Always use the shortest possible cables e Avoid placing low voltage wire parallel to high energy wire
7. CTI 2502 TWO CHANNEL HIGH SPEED COUNTER INPUT MODULE INSTALLATION AND OPERATION GUIDE Version 1 0 CTI Pan 062 00378 010 NT 250210G 25 Copyright O 2008 Control Technology Inc All rights reserved This manual is published by Control Technology Inc 5734 Middlebrook Pike Knoxville TN 37921 This manual contains references to brand and product names which are tradenames trademarks and or registered trademarks of Control Technology Inc and Siemens AG Other references to brand and product names are tradenames trademarks and 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 of any kind including but not limited to the warranties of merchantability or fitness for a particular purpose This document and the products it references are subject to change without notice If you have a comment or discover an error please call us toll free at 1 800 537 8398 REVISION HISTORY Version 1 0 04 23 08 Original Release 01 18 11 Changed ON OFF voltages for count inputs on specification page CTI 2502 Installation and Operation Guide iii PREFACE Thi
8. ce To remove the module from the I O base loosen the captive screws then remove the module from the l O base Be careful not to damage the edge card at the back of the module when inserting or removing the module 2 5 Wiring the I O Connector Input output signals are wired through a connector assembly located on the front of the module The connector assembly consists of a standard CTI 2500 40F front panel edge connector that mates with the printed circuit board Wiring is connected to the front connector via recessed screw terminals The screw terminals can accept wire sizes up to single stranded 14 gauge wire The actual size used depends on the external device providing the input signal Consult the device manufacturer s recommendations for selecting the input wire size Connector pinout and typical wiring for the 2502 is shown in Figure 2 2 below 12 CTI 2502 Installation and Operation Guide 5 24 VDC Sinking driver CH1 A CH1 A CH1 B CH1 B Encoder CH1 RST CH1 RST CH1 INH CH1 INH 5 24 VDC fe CH1 Y1 CH1 Y2 5 24 VDC enn Sourcing CH2 A driver CH2 B CH2 B CH2 RST CH2 RST CH2 INH CH2 INH EC 5 24 VDC a CH2 Y1 CH2 Y2 Figure 2 2 2502 I O Connector Wiring 2 6 Adding the Module to the I O Configuration After power is applied to the base the module will power up and run its diagnostics If th
9. e module diagnostics detect no problems the status indicator on the front of the module will light If the status indicator does not light begins blinking or goes out during operation the module has detected a failure For information on viewing failed module status refer to your PLC user manual To diagnose and correct a module failure refer to the Section 3 next section on troubleshooting CTI 2502 Installation and Operation Guide 13 The module must also be 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 configuration chart listing all slots on the base and the inputs or outputs associated with each slot refer to your Programming Manual The example in Figure 2 3 below shows the WorkShop Edit I O Base dialog with the 2502 installed in Slot 1 after a Read I O Base is performed The module logs in as 3WX 5WY Edit 1 0 Base Channel 1 Base D Enabled 1 0 Module Definition Slot WO Add X oosscocococooco Clear Base Edit Slot Clear Slot Read 1 0 Base ooooooooo0o000009 lt oooooooooooowoo Accept Cancel Figure 2 3 Example I O Configuration Chart In this example the module I O address comes in as default 1 on the Read I O Base To change this starting address just highlight the slot and click Edit Slot to bring up the dia
10. gured correctly in the I O Configure module Nonfatal error reported by CPU Module configured incorrectly in controller Reconfigure the module Figure 3 1 Troubleshooting Matrix If after consulting the chart above you are unable to diagnose or solve the problem contact your local distributor or CTI at 1 800 537 8398 for further assistance CTI 2502 Installation and Operation Guide SPECIFICATIONS Count Inputs Maximum Frequency Duty Count Mode Quadrature Mode Cycle Frequency Frequency 10 10Khz 4 Khz 20 25 Khz 8 Khz 25 30 Khz 10 Khz 30 35 Khz 12 Khz 40 50 Khz 15 Khz 50 45 Khz 15 Khz 60 35 Khz 15 Khz On voltage 2 76 VDC Current on 8 to 16 mA Off voltage 0 8 VDC Current off 0 to 1 mA Reset and Inhibit Inputs On voltage 4 to 28 VDC Current on 2 to 40 mA Off voltage 1 5 to 1 5 VDC Current off O to 0 75 mA Outputs User voltage 28 VDC max Voltage drop 1 8 VDC max 400 mA 1 0 VDC max O 25 mA Leakage current 500 uA max Max current 500 mA Backplane Power 3 Watts maximum Operating Temperature 0 to 60 C Storage Temperature 40 to 85 C Relative Humidity 5 to 95 Agency Approvals Pending UL ULC CE Class 1 Div 2 Shipping Weight 1 5 Ib 0 68 Kg Specifications subject to change without notice CTI 2502 Installation and Operation Guide 21 APPENDIX A COMPATIBILITY WITH SIEMENSO 505 7002 Overview The CTI 2502 Analog Input Module was de
11. hibit input becomes inactive Counter Input A Counter Input B The relationship of the states of these two inputs combined with the counter mode setting determines the direction of the count Typical devices for counting are high speed static switches or incremental encoders NOTE When in the pulse counter mode if the A or B input is in a different state at the beginning and end of an inhibit signal the count will change according to the normal counting logic If both A and B inputs are in different states the change may be as much as two counts There are also software reset and inhibit functions 1 5 Outputs Each channel has two open collector outputs capable of driving TTL level signals or sinking up to 0 4 Amps of current from an external 24 VDC source and load The drawing below shows how the output circuits work Y Output Output Return Output Circuit Y1 0 P1 P2 65 535 Counter Value Figure 1 3 Operation of Counter Output Circuits 4 CTI 2502 Installation and Operation Guide The output transistors Y1 or Y2 turn on when the count is greater than or equal to the corresponding preset 1 6 Counting Modes Each channel supports independent selection of two possible counting modes Pulse Counter Mode counting occurs on the rising or falling edge of the incoming pulses The relationship of the states of the two inputs determines the direction of the count T
12. his mode is typically used for counting using high speed static switches or incremental encoders Details on operation are included in Section 1 6 1 below Quadrature Counter Mode counting occurs according to rising and or falling edges This mode is typically for counting with optical encoders Different quadrature modes are selected based on the resolution required by the application and the encoder used 1 6 1 Pulse Counter Mode In pulse counter mode the module counts up or down on the rising and falling edges of the A and B inputs Up down selection and rising falling selection are based on the relationship of the A and B inputs as show in Table 1 below Note the input pulse width must be greater than 8us to guarantee reliable counting A Input B Input Counter Direction Edge Pulse High Up Rising Low Pulse Up Falling High Pulse Down Rising Pulse Low Down Falling Table 1 1 Counting in Pulse Counter Mode 1 6 2 Quadrature Counter Mode In quadrature count mode each channel counts based on rising and falling edges Three different quadrature modes are available 1X 2X 4X Selection of quadrature mode for an application depends on the resolution required and the encode used A description of each mode is included in Sections 1 6 2 1 1 6 2 3 below 1 6 2 1 1X Quadrature Mode In 1X Quadrature mode the module counts on the edges of the A input pulses When input A leads input B the count is up on each rising edge of inp
13. log box to set a new starting I O address for the module 14 CTI 2502 Installation and Operation Guide 2 7 Module Programming 2 7 1 Controller Input Output Words The 2502 Two Channel High Speed Counter module logs into the PLC and is configured as three WX input words and five WY output words The input words contain module and counter status information The output words are used for controlling the counters and setting presets 2 7 2 WX1 Module Status Word WX1 is the module s status word Eight bits provide the status of each of the two channels Table 2 1 shows the format of the status word BIT MSB 1 CH1 Reset status 1 counter reset 2 CH1 Inhibit status 1 count inhibited 3 CH1 Output 1 status 1 on 4 CH1 Output 2 status 1 on 5 CH2 Reset status 1 counter reset 6 CH2 Inhibit status 1 count inhibited 7 CH2 Output 1 status 1 on 8 CH2 Output 2 status 1 on 9 Reserved 0 10 Reserved 0 11 Reserved 0 12 Reserved 0 13 Reserved 0 14 Reserved 0 15 Reserved 0 LSB 16 Reserved 0 Table 2 1 Module Status Word Reset Status When the channel s RESET input is active this bit will be 1 otherwise this bit will be O Note that the Reset Command bits in WY4 do not affect the reset status bit this bit is tied only to the field reset input Inhibit Status When the channel s INHIBIT input is active or if its Inhibit Command WY4 bit is 1 thi
14. pers as shown below in Figure 2 1 You can configure each channel to operate in any of four counter modes 1X Quadrature Mode 2X Quadrature Mode 4X Quadrature Mode Pulse Counter Mode The default setting for the jumpers is 1X Quadrature mode for both channels NOTE Each channel must be configured for only one mode Do not install additional jumpers Channel 2 Counter Mode Selection Channel 1 Reset Filtering Mode Selection JADRATURE MODE X4 QUADRATURE MODE X2 R25 Wa guanine uont ES Channel 1 Counter Mode COUNT MODE Selection Channel 2 Reset Filtering Mode Selection Figure 2 1 Configuring Module Jumpers CTI 2502 Installation and Operation Guide 11 2 3 2 Setting the Reset Filtering Mode The counter reset inputs include a settable filtering circuit to customize the operation of the input according to your requirements The standard or SLOW setting uses a 3 75ms filter Some applications require faster response on the reset input line than the standard 3 75ms filter allows For faster response select the optional FAST 0 95 ms filter The reset filter may be selected independently for each input channel as shown above in Figure 2 1 2 4 Inserting the Module into the I O Base Insert 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 pla
15. s Installation and Operation Guide provides installation and operation instructions for the CTI 2502 Two Channel High Speed Counter Input Module for CTI 2500 Series and Simatic 505 programmable controllers We assume you are familiar with the operation of Simatic 505 series programmable controllers Refer to the appropriate user documentation for specific information on programmable controller you are using This Installation and Operation Guide is organized as follows Chapter 1 provides a description of the module Chapter 2 covers installation and wiring Chapter 3 is a guide to troubleshooting Appendix A details compatibility between the 2502 and the Siemens 505 7002 The Model 2502 Two Channel High Speed Counter Input Module CTI 2502 Installation and Operation Guide vi CTI 2502 Installation and Operation Guide USAGE CONVENTIONS NOTE Notes alert the user to special features or procedures CAUTION Cautions alert the user to procedures that could damage equipment WARNING Warnings alert the user to procedures that could damage equipment and endanger the user CTI 2502 Installation and Operation Guide vii viii CTI 2502 Installation and Operation Guide TABLE OF CONTENTS CHAPTER 1 OVERVIEW Serie ege Ae 1 1 0 Product Gummam 1 Talis TEEN 1 1 2 Fr nt Panel Deseriplion 42 inan 2 1 2 1 Active LED 1 2 2 Status LEDs 1 2 Input Output Connector sinna a rail 3 1 3 Asynchronous Operation
16. s bit will be 1 and the counter will not count Otherwise this bit will be 0 Output 1 Output 2 Status When the corresponding field output is on the bit will be 1 Otherwise the bit will be 0 CTI 2502 Installation and Operation Guide 15 3 1 2 WX2 WX3 Current Count Values WX2 contains the current value of the Channel 1 counter WX3 contains the current value of the Channel 2 counter These values are unsigned integers between 0 and 65 535 3 1 3 WY4 Module Setup Word WY4 is the module setup word which is used to control operation of the module as shown in Table 2 2 below BIT MSB 1 CH1 Reset 1 reset counter O default 2 CH1 Inhibit 1 inhibit counter O default 3 CH1 Output 1 0 output goes on when the current count is greater than or equal to the preset If the current count is less than the preset the output is off 1 output goes on when the current count is less than the preset If the current count is greater than or equal to the preset the output is off 4 CH1 Output 2 5 CH2 Reset 1 reset counter O default 6 CH2 Inhibit 1 inhibit counter O default 7 CH2 Output 1 0 output goes on when the current count is greater than or equal to the preset If the current count is less than the preset the output is H2 Bolt 2 E Oui 1 output goes on when the current count is less than the preset If the current count is greater than or equal to the preset the output is off
17. signed to be a drop in replacement for the Siemens 505 7002 From set up of the module to wiring and PLC reporting the user will find many similarities between the CTI and Siemens models Using the CTI 2502 in a 505 7002 application The CTI 2502 should fulfill all the following requirements for the 505 7002 replacement as outlined below Module setup The CTI 2502 provides the same jumper based module configuration although the jumpers are located in difference positions than the 505 7002 Wiring The wiring of the input connector is the same between the CTI 2502 and the Siemens 505 7002 PLC Reporting The word format is the same between the modules CTI 2502 Installation and Operation Guide 23 APPENDIX B JUMPER SETTINGS LOG SHEET CTI 2502 Installation and Operation Guide 25 LIMITED PRODUCT WARRANTY For product warranty information see the CTI web site at http www controltechnology com support warranty CTI 2502 Installation and Operation Guide 27 REPAIR POLICY For repair information see the CTI web site at http www controltechnology com support repairs CTI 2502 Installation and Operation Guide 29
18. unt inputs and of Y1 and Y2 outputs e All inputs may be sinking or sourcing with external 24 VDC power supply WARNING The High Speed Counter Module directly controls its four outputs Even when the programmable controller switches from the Run mode to the Program mode the High Speed Counter continues to function and activate its outputs as programmed This means that if you switch the controller to Program mode any devices controlled by the four outputs of the High Speed Counter will continue to operate as programmed CTI 2502 Installation and Operation Guide 1 2 Front Panel Description nie qe Se oe oe se Active LED Status LEDs 6000000090908 1 0 Connections oe 006050000 Figure 1 1 2502 Front Panel 1 2 1 Active LED The Active LED will be illuminated when the module is functioning normally If the Active LED is not lit or if it is blinking refer to Chapter 3 for troubleshooting 2 CTI 2502 Installation and Operation Guide 1 2 2 Status LEDs The module front panel includes LEDs to show the operational status of each channel as follows A Input A status turns on when HIGH SPEED current is flowing in the A COUNTER input for each channel 2 CH Input B status turns on when current is flowing in the B ACTIVE input for each channel A i Eee ACTIVE LED turns on e e when module is operating e normally Flashes or goes off when there is a Output 1 status t
19. urns on when _ Ee Oy diagnostic error output 1 is ON for each channel C C e CHI CH2 Output 2 status turns on when output 2 is ON for each channel Figure 1 2 Status LEDs 1 2 Input Output Connector This connector provides wiring terminals for inputs and outputs to the module The wiring connector accepts 14 22 AWG wire Wiring connector pinout is shown in Section 2 5 1 3 Asynchronous Operation The module operates asynchronously with respect to the PLC The controller is programmed to monitor and control the operation of the High Speed Counter module using the words and bits provided in the module interface The module provides reset inhibit output and counter status in three WX input words The controller uses 5 WY output words to control counting control outputs and set counter presets CTI 2502 Installation and Operation Guide 1 4 Inputs The 2502 Two Channel High Speed Counter Module has two independent counting channels Each channel has four inputs Each input may be used as either sinking or sourcing with external 5 24 VDC power supply The input signals are connected to the field wiring terminal block Reset Current flow through the reset input sets the channel s counter to zero The counter will be held at zero until the reset input becomes inactive Inhibit Current flow through the inhibit input inhibits the channel from counting The counter holds at the last value and does not change until the in
20. ut A When input B leads input A CTI 2502 Installation and Operation Guide 5 the count is down on each falling edge of input A Figure 1 4 below illustrates the relationship between inputs A and B and the count value in 1X Quadrature mode 1X Quadrature 1 2 1 0 Count up Count down Input A leads Input B leads Figure 1 4 Counting in 1X Quadrature Mode 1 6 2 2 2X Quadrature Mode In 2X Quadrature mode the module counts on both the rising and falling edges of the A input pulses When input A leads input B the count is up on each rising and falling edge of input A When input B leads input A the count is down on each rising and falling edge of input A Figure 1 5 below illustrates the relationship between inputs A and B and the count value in 2X Quadrature mode 2X Quadrature 1 2 3 4 3 2 1 0 E Na Z Y Count up Count down Input A leads Input B leads Figure 1 5 Counting in 2X Quadrature Mode 1 6 2 3 4X Quadrature Mode In 4X Quadrature mode the module counts on the edges of both A input and B input pulses When input A leads input B the count is up on each rising and falling edge of both 6 CTI 2502 Installation and Operation Guide input A and input B When input B leads input A the count is down on each rising and falling edge of both input A and input B Figure 1 6 below illustrates the relationship between inputs A and B and the count value in 4X Quadrature mode 4X Quadrature 1234567 8 76543

2502 2-Channel High Speed Counter Input Module

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