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Contec CNT24-2GY, User Manual

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Contec CNT24-2GY User Manual Download Page 45

3. Setup 

 

 

 

 

38 

CNT24-2(USB)GY 

Using Several Products of the same Model 

Each module should be assigned a unique Module ID in order to let USB driver 

recognize them when several products of the same model are being used. 

Factory settings (=00) can be used when only one module is connected to one 

computer. 

Unnecessary to set Module ID 

 

 

 

 

 

Necessary to set Module ID 

 

 

 

Setting a Module ID 

 

 

 

 

 

 

 

Stand alone 

Expansion module being used 

Multiple modules with different 

model being 

 

only one module being used, 

factory settings(is 00) 

multiple modules being used, 

setting different value 

Multiple modules same model being used 

Summary of Contents for CNT24-2GY

Page 1: ...PC HELPER Isolated 24 bit Up Down Counter Module for USB CNT24 2 USB GY User s Guide CONTEC CO LTD ...

Page 2: ... is subject to change without notice All relevant issues have been considered in the preparation of this document Should you notice an omission or any questionable item in this document please feel free to notify CONTEC CO LTD Regardless of the foregoing statement CONTEC assumes no responsibility for any errors that may appear in this document or for results obtained by the user as a result of usi...

Page 3: ... Number Label 1 1 The bundled disk contains the driver software and User s Guide this guide Check the contents to make sure that you have everything listed below If you do not have all the items or have any damage contact your distributor or CONTEC group office where you purchased 1 2 3 5 7 9 B F 8 1 2 3 5 7 9 B F 8 System unit Disk API USBP WDM USB cable Interface connector plugs Protective Rubbe...

Page 4: ...ries Option 5 Customer Support 6 Web Site 6 Limited One Year Warranty 6 How to Obtain Service 7 Liability 7 Safety Precautions 7 Safety Information 7 Handling Precautions 8 Environment 9 Inspection 10 Storage 10 Disposal 10 2 Module Nomenclature 11 Module Nomenclature 11 3 Setup 13 Connection Overall Diagram 13 Setting a Module ID 13 Setup Flow 14 Software Installation 14 Illustration of Menu Scre...

Page 5: ...red Mode 30 Installing the Module 33 Installation Orientation 33 Mounting with magnets 34 Mounting on a DIN Rail 35 Using Several Products of the same Model 38 Setting a Module ID 38 4 Application Development 39 Reference to Online Help 39 Printing Function Reference 39 Sample Program 40 Distributing Developed Application 40 Utility 40 5 Troubleshooting 41 Troubleshooting 41 Q A 42 Diagnostic Prog...

Page 6: ...onnecting the Module 53 Removing the Module 54 7 Product Specification 55 Hardware Specification 55 Software Specification 58 Circuit Block Diagram 59 Physical Dimensions 60 External Input and Output Circuit 61 Protection Circuit Introduction 63 Surge Voltage Countermeasures 63 8 Appendix 65 Glossary 65 ...

Page 7: ...vi CNT24 2 USB GY ...

Page 8: ...compact isolated up down counter module which is applied to USB and can be used easily It not only counts high speed pulses but also can be used for position alignment control in combination with an encoder In addition external electric do not have direct effect on the host computer because of the isolation between control external signals and the CPU of the controller module by Optocoupler Now se...

Page 9: ...modes The count method supports single phase input 2 phase input and single phase input with gate control Because it can be connected with a rotary encoder using it can easily perform the position detection and revolution speed measurement Single phase input It can be used to keep track of the number of good products and inferior products on a product examination line 2 phase input It can be used ...

Page 10: ... is made by Optocoupler the change of external circuit will not affect the computer by USB port There is not external electric effect on the host computer by way of USB ports because of the isolation between the CPU of the module and external device by Optocoupler Easy to wire The system incorporates a screwless connector plug that allows you to easily attach and detach wires without using any spe...

Page 11: ...op application sample program Visual Basic Visual C Delphi and C Builder sample programs have been prepared Functions convenient for developing generic applications such as the functions that acquire the list of the current available modules are prepared Easy to debug utility Counter monitor Without programming the user can easily operate the module The current status can be verified by the indica...

Page 12: ...sic and Visual C etc and diagnostic program useful for checking operation is provided For more details on the supported OS applicable language and how to download the updated version please visit the CONTEC s Web site http www contec com apipac Accessories Option Isolation counter module Expansion module for CNT24 2 USB GY CNT24 2 FIT GY AC adapter input 90 264VAC output 5VDC 2 0A POA200 20 2 AC D...

Page 13: ...uct is warranted by CONTEC CO LTD to be free from defects in material and workmanship for up to one year from the date of purchase by the original purchaser Repair will be free of charge only when this device is returned freight prepaid with a copy of the original invoice and a Return Merchandise Authorization to the distributor or the CONTEC group office from which it was purchased This warranty ...

Page 14: ...enced usage misuse or malfunction of this device Safety Precautions Understand the following definitions and precautions to use the product safely Safety Information This document provides safety information using the following symbols to prevent accidents resulting in injury or death and the destruction of equipment and resources Understand the meanings of these labels to operate the equipment sa...

Page 15: ...ector Connect the USB connector plug to the ground Attach ferrite cores to the USB cable When using the AC adapter attach ferrite cores to its power cable Connect the connector of the AC adapter bundled to the ground so that the FG pin in the 5 VDC input terminal is connected to the ground If you notice any strange odor or overheating please unplug the power cord and USB cable immediately Otherwis...

Page 16: ...ity Installation Site E04SR301334 SEIWA 2 1 on USB cable at product side E04SR200917 SEIWA 3 1 on power cable at product side Equivalent product can also be used Image diagram Environment Use this product in the following environment If used in an unauthorized environment the board may overheat malfunction or cause a failure Operating temperature 0 50 C Operating humidity 10 90 RH No condensation ...

Page 17: ... sunlight moisture shock vibration magnetism and static electricity Disposal When disposing of the product follow the disposal procedures stipulated under the relevant laws and municipal ordinances Make sure that the connectors on the module side are correctly connected with the cables The ventilation slits are not covered and neither dust nor alien substance is attached to the ventilation slits P...

Page 18: ...re of Module Components CNT24 2 USB GY 1 When you use the module in a noisy environment or are nervous about noise ground the module using a M3 screw 2 When you use the module in a noisy environment or are nervous about noise connect the FG pin in the 5 VDC input terminal to the ground To ground the FG pin use the AC adapter accessory Counter input LINKstatus LED 5VDC input Module ID USB port Coun...

Page 19: ...A input status GREEN ON when a current flows from pin PA low level negative logic Phase B status Phase B input status GREEN ON when a current flows from pin PB low level negative logic Phase Z status Phase Z input status GREEN Positive logic ON when pin PZ is open high level positive logic Negative logic ON when a current flows from pin PZ low level negative logic Counter input status Counter inpu...

Page 20: ...d a unique Module ID in the range of 00 7Fh when several modules with the same model are being connected There are two rotary switches moreover x16 and x1 represent high bits and low bits of Module ID respectively Figure 3 2 Setting a Module ID Module ID x16 Module ID x1 0 0 Module ID x16 Module ID x1 1 2 0 1 2 3 4 5 6 7 9 A C E F 8 0 1 2 3 4 5 6 7 9 A C E F 8 0 1 2 3 4 5 6 7 9 A C E F 8 0 1 2 3 4...

Page 21: ...AUTORUN EXE X disk drive from Run in Start menu The screen design may be different Connecting to a PC Installing USB driver Setting Properties Using Device Manager Setting device name Software Installation API USBP WDM Development Environment Utilities Page 14 Page 16 Page 18 Install the Development Environment such as sample programs and online help etc Install the utility Refer to the user s gui...

Page 22: ...ple program in all language in order to use API function 1 Clicking on Install Development or Execution Environment API USBP WDM Installer dialog box displays 2 Selecting Advanced Counter input driver 3 Clicking on Install Button Please perform installation following the directions on the screen And thus the installation is completed The screen design may be different ...

Page 23: ...Windows 2000 or Windows XP The name detected by Windows and displayed by software is the model removing the GY It may cause a trouble in recognizing and operating the device according to the kind of USB hub If you use the USB hub we encourage you to take advantage of the CONTEC s product loan service to confirm operation before purchasing Step1 Setting supplied disk API USBP WDM The menu screen is...

Page 24: ... the Software it is not necessary to operate it about the Hardware Wizard Detect setup information from supplied disk automatically for installing USB driver XXXXXX device name being searched out the name from getting rid of GY from the model Points Please specify the path for supplied disk as follows in the case of failure in detecting automatically X INF WDM CNT X disk drive Step4 Clicking on Fi...

Page 25: ... from getting rid of GY from the model of module In the case of Windows XP 2000 From Start menu click on Settings Control Panel System and then click on Device Manager button in Hardware tab Step2 Setting the Device Name Right clicking on module name and selecting Properties displays Module Properties Open Common Settings tab and enter arbitrary name in the editing box for device name Default name...

Page 26: ...a 9 pin connector that is provided on this product s face Figure 3 3 Signal Layout on the Interface Connector CNT24 2 USB GY 9 8 7 6 5 4 3 2 1 CH0 PCOM 0 PA 0 PB 0 PZ 0 PDI 0 EQ P 0 EQ 0 EQ N 0 N C Plus common for channel 0 input signals Channel 0 phase A input Channel 0 phase B input Channel 0 phase Z input Channel 0 general purpose digital input Plus common for channel 0 output signals Channel 0...

Page 27: ...wire by pressing the orange button on the connector plug Releasing the orange button after the wire is inserted fixes the cable Compatible wires are AWG 28 20 Removing the connector plug by grasping the cable can break the wire Figure 3 4 Connecting an Interface Connector and Connectors That Can Be Used CAUTION 7 8mm Press this section to insert the wire Compatible plug FK MC0 5 9 ST 2 5 made by P...

Page 28: ...utput section has an open collector configuration based on Optocoupler isolation Driving the output of this product requires an external power supply 5 12V Nominal output 35VDC 50mA Max Figure 3 6 Connecting to Count match Output Point A surge voltage protection circuit is not provided on the output transistors for this product Therefore when driving relays lamps and other induction loads using th...

Page 29: ...trol Yes Yes No Yes No Counter Operating Modes Single phase input During single phase input the system counts up upon the input of an UP pulse and counts down upon the input of a DOWN pulse A count fails if UP and DOWN pulses occur simultaneously or both pulses happen to be LOW In the application that the pulses can be LOW simultaneously we recommend you to count them separately In the examination...

Page 30: ...tion is divided the shorter the moving distance can be measured Setting rotary direction of the encoder DIR count up in Clockwise The encoder is set to count up in clockwise so the counter data count up when the encoder turning in clockwise Figure 3 8 2 phase Input count up If the synchronous clear and the input logic of phase Z is set to positive logic shown as Figure 3 8 the counter is zero clea...

Page 31: ...input logic of phase Z is set to positive logic shown as Figure 3 8 the counter is zero cleared when phase A falls with the phase Z input HIGH regardless of the setting of count input multiplier Points The logic of phase Z can be set with software The data after being cleared is not the data set by the initial value Phase Z CLR Phase A Phase A UP Phase B Phase B DOWN Phase Z 6 0 9 8 7 6 5 0 FFFFFF...

Page 32: ...lowing condition the number of rotational velocity can be figured out according to the measured number of pulses Measure time the time that the gate is effective 0 3 sec The number of the encoder s pulses per round 200 pulses Measured pulses 1800 pulses Rotational velocity 1800 0 3 60 200 1800 rpm If the measure time can be set by the resolution of the encoder in advance the input data will be the...

Page 33: ...gure 3 11 Asynchronous Clear Synchronous clear Set the rotary direction of the encoder to clockwise the counter is zero cleared when phase A rises As same with asynchronous clear when phase Z is set to positive logic HIGH level is effective signal When it set to negative logic LOW level is effective signal The timing chart is shown below corresponding to the following settings Counter mode 2 phase...

Page 34: ... be set enabled disabled besides the logic setting There are 3 methods of setting as follows 1 Phase Z input disabled 2 After the method of clearing is set to one time by using CntSetZMode the next phase Z input is effective 3 Enabled for all phase Z input Points The initial setting is Enabled for one time When Enabled for one time is set use CntStopCount stop counting If execute CntStartCount aga...

Page 35: ...be cancelled from the counter data Notice that because all external input signals with the exception of general purpose input signals are directed into the internal counter through the digital filter they are read with a delay of 4 sampling clock cycles In the initial condition external input signals are read with a delay of 0 4µsec Figure 3 13 Digital Filter Points In the initial condition the cl...

Page 36: ...tween count value and count compare value the pulse will not output When you use it you must set the pulse width The signal output section has an open collector configuration based on Optocoupler isolation It can drive 35VDC 50mA load too The equivalent circuit is described in External Input and Output Figure 3 14 Count match Output Points Initial state is pulses width 0 not output 00h The pulse w...

Page 37: ...e module in a noisy environment or are nervous about noise ground the module using a M3 screw 2 When you use the module in a noisy environment or are nervous about noise connect the AC adapter s connector plug to the ground Figure 3 16 Connecting the AC Adapter POA200 20 2 Beside the AC adapter a power supply for installation on a DIN rail is also available as an option Use the appropriate power s...

Page 38: ...D x 94 0 H No protrusions Corresponding AC DC power supply POW AD22GY 85 265VAC 5 0VDC 5 2 0A Max 52 4 W x 64 7 D x 94 0 H No protrusions Corresponding DC DC power supply POW DD10GY 10 30VDC 5 0VDC 5 3 0A Max 25 2 W x 64 7 D x 94 0 H No protrusions Corresponding Figure 3 17 Optional power supply MC1 5 3 ST 3 5 1 Phoenix Contact 1 When you use the module in a noisy environment or are nervous about ...

Page 39: ...below 1 Unplug the USB cable 2 Remove the external power supply connector to stop power supply to the module To use the AC adapter connect it to the module first then plug the AC adapter s connector into a wall outlet When the module is not used leave the AC adapter unplugged Continuously using the AC adapter heated affects its life Use the AC adapter not in a closed place but in a well ventilated...

Page 40: ...d being used on a desk It should be noted that lateral slit of the module being covered brings about malfunction In addition please use the supplied two rubber feet when setting on a desk or others as figure 3 18 A Correct installation orientation Figure 3 18 Installation Orientation Do not cover the ventilation holes A Vertical Front C Horizontal Front Rubber feet B Bottom Front Rear ...

Page 41: ...strength decreases an ability of peeling strength if once removing a magnet from the enclosure of module The example of magneto attachment Notes Please attach in a DIN rail on the wall and use module if connecting expansion modules Please do not close ventilation holes due to prevention of the temperature rise inside a product Otherwise it can bring about malfunction heating and trouble B Side Rea...

Page 42: ... with a flat head screwdriver renders it into a lock enabled condition this should be done on all connected modules Figure 3 19 Mounting on a DIN Rail 1 3 2 Hook the unit an object consisting of a controller and an expansion module from the upper part of the DIN rail and press the lower part of the unit onto the DIN rail Figure 3 19 Mounting on a DIN Rail 2 3 35mm DIN rail Press here to lift the f...

Page 43: ...e can be mounted in one touch Figure 3 19 Mounting on a DIN Rail 3 3 Removal method 1 Lower the fixing hook for the unit to unlock it this operation should be performed on all connected modules Figure 3 20 Removing the Module from the DIN Rail 1 3 Side view Fixing hook 35mm DIN rail ...

Page 44: ...3 3 By lifting the unit you can easily remove it from the DIN rail Figure 3 20 Removing the Module from the DIN Rail 3 3 Any operation involving the disconnection of modules in a unit in which multiple modules are connected that is attached to a DIN rail should be performed after the unit is removed from the DIN rail Side view Side view 5 1 3 7 CAUTION ...

Page 45: ...l are being used Factory settings 00 can be used when only one module is connected to one computer Unnecessary to set Module ID Necessary to set Module ID Setting a Module ID Stand alone Expansion module being used Multiple modules with different model being only one module being used factory settings is 00 multiple modules being used setting different value Multiple modules same model being used ...

Page 46: ...erence is provided in API USBP W32 Help Detailed introduction to search method for help should be found from How to navigate Help in the help For basic usage please reference to Tutorial for help Printing Function Reference Clicking on Print button from online help prints the page being displayed It can be printed entirely as follows in the case of referencing to printing function As figure shown ...

Page 47: ...ided here To run a sample program click on Programs CONTEC API USBP WDM CNT Sample Name from Start menu Distributing Developed Application Please distribute the developed application with USB driver in supplied disk USB driver for counter X INF WDM CNT X disk drive Utility You can verify the operation of USB device simply by using utility programs Please run the help from menu for usage ...

Page 48: ...n connecting with a module Follow the following procedure to delete unknown device Start device manager select Unknown Device and then click on Delete button USB Device is registered with device manager Windows 2000 The cause is incorrect operation such as canceling the wizard by mistake when connecting with a module Follow the following procedure to delete unknown device Start device manager sele...

Page 49: ...e we do not verify the operation Can it be used without programming knowledge There are supplied software Development Environment for application development on the disk Applications are basically developed in corresponding language and utility programs can be used to check status if you only want to monitor I O status Can run with other applications together simultaneously It is possible because ...

Page 50: ...s corresponding to those modules will be used For example channel 0 input of module A channel 0 input of module B When the expansion modules are added they can be used in the image based on the number of points in the USB modules For example in the case of the number of input channels of USB module is 8 channel 0 input of USB module A channel 8 input of expansion module B Therefore they can be tre...

Page 51: ...ity exists in hardware or software Run diagnostic program open Properties for module of device manager and then click on Diagnosis button in Common Settings tab Using Diagnostic program you can not only verify the status of current output but also perform further diagnosis by clicking on Diagnosis Report button ...

Page 52: ...d When using self power remove AC adapter in order to reset status Step2 Set Module ID to FFh Set Module ID FFh It is special setting for firmware upgrade Point Modules should be performed firmware version upgrade one by one Upgrade for multiple modules can not be performed at the same time Step3 Connecting module with USB port Please connect USB port after AC adapter has been connected when using...

Page 53: ...more After completing upgrade perform settings again by referencing to Setting Properties Using Device Manager on page 18 Point Use the firmware upload function if you wish to backup the old firmware before downloading the new firmware 1 Click the Start backup button and specify where to save the uploaded file 2 Click the OK button to start the upload Driver Upgrade If there is up to date driver i...

Page 54: ... Server 2003 Uninstall the device driver Use My Computer Control Panel Programs and Features to uninstall the device driver Select Windows driver package CONTEC and then click Uninstall contains the driver category name caio ccnt cdio csmc etc Uninstall procedure for XP and Server 2003 use My Computer Control Panel Add and Remove Programs to uninstall the device driver Uninstall the development en...

Page 55: ... uninstall the development environment Select CONTEC API WDM VerX XX development environment and then click Change Remove contains the driver category name AIO CNT DIO SMC etc Uninstall procedure for Windows 98 98SecondEdition Uninstalling the device driver Use My Computer Control Panel Add or Remove Programs to uninstall the device driver Select CONTEC API WDM driver and then click Change Remove ...

Page 56: ...o the installation space are controlled Up to 3 modules CNT24 2 FIT GY can be connected when adding channels In the case of combination of this product and three expansion modules CNT24 2 FIT GY it is possible to control 16 channels output by way of one USB port Table 6 1 Expansion Module Figure 6 1 Expansion Module Points Up to 3 modules can be connected Please use the supplied AC adapter when ad...

Page 57: ... front when adding modules The ID for the first module being added must be 1 and values 2 and 3 are for the following two modules respectively Furthermore the factory setting for the Device ID is 0 To avoid malfunction please do not set the Device ID to one other than 1 2 and 3 Figure 6 2 Setting a Device ID CAUTION ...

Page 58: ...ies CNT24 2 USB GY 51 Connection between Modules Stack Connection Locking Devices The module contains connecting locking devices mark two units at the top and bottom Figure 6 3 Stack Connection Locking Devices Locking device Stacking hook ...

Page 59: ...a tool that has a slender tip downward from above to open the spring for the locking device the groove moves toward you Push the groove of the locking device with a tool that has a slender tip in the direction of the arrow until the device is locked Figure 6 4 How the Stack Connection Locking Device Works Locking device Stacking hook Locking device Stacking hook ...

Page 60: ...le Inserting the stack hook by aligning it with the hook insertion inlet for the other device automatically locks the module If a stack connector protective cover is attached the connection operation should be performed after the cover is removed Figure 6 5 Connecting the Module ...

Page 61: ...6 Connecting with Expansion Accessories 54 CNT24 2 USB GY Removing the Module Unlock the locking device at the top and the bottom Remove the connected module from the hook Figure 6 6 Removing the Module ...

Page 62: ...ne x 2 channels Phase Z CLR One x 2 channels General purpose input One x 2 channels Input resistance 220Ω and above Input ON current 15 25mA Input protection circuit Not available Response frequency 500kHz 50 Max duty 1 External power 5 12VDC 10 400mA Min Digital filter 0 1 105 6µsec Count match Output 5 Output count One x 2 channels Output format Optocoupler isolated open collector output Rated o...

Page 63: ...tible wires AWG28 20 Bundled AC adapter POA AD22 90 264VAC 5 0VDC 5 2 0A Max Length of cable is about 1 4m Standard VCCI Class A CE Marking EMC Directive Class A RoHS Directive 1 Module executes API function by USB communication The executing time of API function by USB communication is about several msec in practice Depending on the contents handled by API function it may be longer than that The ...

Page 64: ...perating temperature 0 40ºC Operating humidity 20 80 RH No condensation Life expectancy 4 years at the ambient temperature 40 ºC When 100VAC is input and 1 3A is output Allowable time of short interruption 15ms Max When 100VAC is input and 1 3A is output 1 Floating dust particles Not to be excessive Corrosive gases None Voltage corresponding to the attached AC cable 125VAC 7A 1 When the short inte...

Page 65: ...08 Microsoft Windows Vista Microsoft Windows Server 2003 Microsoft Windows XP Professional Edition Home Edition Microsoft Windows 2000 Professional Edition Microsoft Windows Me Microsoft Windows 98 and Second Edition Microsoft Windows Embedded Standard Support language Microsoft Visual C Ver5 0 Ver6 0 Microsoft Visual C NET2002 2 2003 2 2005 2 2008 2 2010 2013 Microsoft Visual Basic Ver5 0 Ver6 0 ...

Page 66: ... is fixed at 0 5V D D GND USB Connector Flash POM 512KB DRAM 2MB USB Controller Micro processor Module ID Device ID Control Circuit Count Data Register Counter Digital Filter Comparator Data Comparator One spot Pulse Optocoupler Optocoupler Transistor Optocoupler Optocoupler Transistor Interface Connector CH0 Interface Connector 1 Stack Connector ...

Page 67: ...Dimensions Figure 7 3 Physical dimensions of attached AC adapter POA200 20 2 mm 1 2 50 4 3 5 94 1 2 64 7 4 1 2 1 2 PCOM PA PB PZ PD1 EQ P EQ EQ N PCOM PA PB PZ PD1 EQ P EQ EQ N 0 1 2 3 4 5 6 7 9 A BCD E F 8 0 1 2 3 4 5 6 7 9 A BCD E F 8 A B Z D1 CH0 CH1 LINK 14 0 35 0 45 0 14 0 31 5 ...

Page 68: ...en an external power supply other than 5V is used insert a current limiting resistor at position R If PV denotes an external power supply the current limiting resistor R can be calculated as follows For example P 12V will require the following resistance 350Ω R 470Ω In addition the general purpose input signal also has a similar circuit configuration P 5 20 P 5 15 RkΩ Module External circuit Optoc...

Page 69: ...al is output to the outside The signal output section has an open collector configuration based on Optocoupler isolation Driving the output of this module requires an external power supply Figure 7 5 Output Circuit and an Example of a Connection Output pin Opto coupler Plus common Minus common Load External power supply 5V 12VDC Vcc Module External circuit ...

Page 70: ...ge tolerance level of the output transistor it can cause the transistor to gradually deteriorate or even completely damage the transistor Therefore when driving an induction load such as a relay coil you should always connect a surge absorbing device The following illustrates a surge voltage countermeasure that can be employed Figure 7 6 Surge Voltage Countermeasures In order for a protection circ...

Page 71: ...7 Product Specification 64 CNT24 2 USB GY ...

Page 72: ...is only for expansion modules The channel number is decided by the setting Self power Supplying power by using AC adapter is called Self Power Please make use of AC adapter when using expansion modules Device driver It is software to operate and set peripheral equipment by a PC and the peripheral equipment is installed on the PC It is simply called Driver Device manager It is a Windows tool which ...

Page 73: ...31 Himesato Nishiyodogawa ku Osaka 555 0025 Japan https www contec com No part of this document may be copied or reproduced in any form by any means without prior written consent of CONTEC CO LTD 08252017 09202002 Management No A 46 657 08252017_rev9 Parts No LYBQ497 ...

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