KY WONG

MrPLC Member
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About KY WONG

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  • Country Malaysia
  1. Parity Error

    Problem solve. Thank you very much. @kaare_t & @Wasan  
  2. 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. 
  3. 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?  
  4. QJ71C24N INPUT PROBLEM

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

    @Wasan Here is the setting of my plc and the code of PLC program.
  6. 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? 
  7. 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?    
  8. 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? 
  9. 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? 
  10. QJ71C24N INPUT PROBLEM

    I am using QJ71C24N to communicate with my devices, ASCII mode. I can send my output to the device by using non-protocol method ( G.output). However,  when I using G.input to try to receive the feedback from my device. The signal seen not stable to receive by my PLC. Sometime can get the full signal sometime can't and sometime I get some messy signal. Is there any setting I need to set to get the stable feedback from my device? Please anyone can help me to solve this problem?