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I am trying to implement a modbus protocol to communicate with a mitsubishi A3U PLC. After reading the manual, I have some difficulty to deduce the definition of the frame formation.
For standard Function (Eg. 01,02,03,etc)
- How to derive the "Device designation" code for a particular device such as X,Y,D,etc?
For Optional function code (Code 65-75)
- It is mentioned in the manual that the function 70 can be changed via some setting. If the function code is changable, how can I know what my current PLC is using for this function?
- What is the PC number in the message format?
- Is the Address refer to ID set on the AJ71UC24 in the message format?
I will try to implement the comm. code in Labview. Is there anyone who had build these type of code (Mitsubishi Modbus) before?
Thank you.
Regards
YikTH
For standard Function (Eg. 01,02,03,etc)
- How to derive the "Device designation" code for a particular device such as X,Y,D,etc?
For Optional function code (Code 65-75)
- It is mentioned in the manual that the function 70 can be changed via some setting. If the function code is changable, how can I know what my current PLC is using for this function?
- What is the PC number in the message format?
- Is the Address refer to ID set on the AJ71UC24 in the message format?
I will try to implement the comm. code in Labview. Is there anyone who had build these type of code (Mitsubishi Modbus) before?
Thank you.
Regards
YikTH