KY WONG

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About KY WONG

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  • Country Malaysia
  1. Hi friends,   I am using G(P).CPRTCL to create the RS485 communication code to control my OMRON Temperature controller Modbus. However, I find out that the generate crc-16 code for my comment is different from the calculated MODBUS CRC-16 . How can it be? I am using predefine function of PLC. It should give me a correct crc-16 right?  @Wasan, @kaare_t
  2. Problem of qj71c24N for modbus RTU control 2

    @Wasan Thank for your help and solution. Thank you very much. 
  3. Problem of qj71c24N for modbus RTU control 2

    Because there is no any error is given by the plc . I think my system is waiting for the answer from external device. Is there any place can adjust the waiting message ? 
  4. Hi friends,   I am facing a problem. When my device is suddenly disconnect with RS485 modbus connection, my QJ71C24N card is not no error coming out and it refuse to continuous sending out signal even my program is keep calling on for G(P).CPRTCL . How can I reset the situation without turn off my PLC and how can I detect it which is not given me any error condition?  @Wasan @kaare_t
  5. Problem of qj71c24N for modbus RTU control

    @Wasan, @kaare_t Please help. 
  6. I got a problem when i using the predefined protocol support function of GX work2. When i write the setting into the module, there is a message come out.  Any of you facing this problem before? and how can I solve it? Need help.
  7. Parity Error

    Problem solve. Thank you very much. @kaare_t & @Wasan  
  8. QJ71C24N INPUT PROBLEM

    @kaare_t & @Wasan  thanks for helping me to solve the problem. I am grad to meet you here. Thank you very much. 
  9. Parity Error

    Any one  have any experience to due with Parity Error when RS485 input can't get? Below is the circuit trace i get. It shown me that Parity Error when input signal from my device. But some of the time I can get the input message completely. Sometime can't. Is there any way to solve it?  
  10. QJ71C24N INPUT PROBLEM

    @Wasan I have just get 1 more issue. What is this mean?  Do you have this experience before?  
  11. QJ71C24N INPUT PROBLEM

    @Wasan Here is the setting of my plc and the code of PLC program.
  12. QJ71C24N INPUT PROBLEM

    @Wasan I have adjust the setting of echo back function. However, I still get the echo back in my input. Is there any setting I need to adjust? 
  13. QJ71C24N INPUT PROBLEM

    @Wasan My device end code is <CR> only. It mean that my receive complete code specification setting is 13(Dh) right? The entire received input will go to specify buffer memory right?    
  14. QJ71C24N INPUT PROBLEM

    @kaare_t I wish to understand about the checksum. For your information, my ASCII Modbus device is using CheckSum8 Xor. Is there any PLC code can generate the Checksum for it? For your information, now I temporary off the function of checksum in my device function.  Before this, I have used the FX PLC RS485 communication (RTU modbus format). As  I know there is a PLC code to generate the CRC-16/Modbus. Is the Q series having the special code to generate the CRC too? 
  15. QJ71C24N INPUT PROBLEM

    Mr. Wasan, May I know is the signal reply timing will affect the result too? Because I saw there is some adjustment of the time of feedback signal. Is the timing of feedback will affect the feedback signal in my PLC? & Is there any command in Q series plc to calculate the CRC value for RS485?