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How does configure Modbus RTU RS-485 card with Honeywell Slate PLC ?.

Does anyone installed  a M series serial interface  series 2 card model VE4006P2 to talk to Honeywell Slate PLC through Modbus RTU in RS-485 ?. I did this connection with the folowwing setup .

Delta-V side : Master, Modbus address = 6,  baud raute = 9600, parity none, stop bits = 1 ,  data bits = 8, half duplex.  

Data set properties for PLC :

Slate register 42565

Honeywell Slate PLC side : Slave, Modbus address = 6, baud rate = 9600, parity none, stop bits = 1, data bits = 8, half duplex.  

Format of the register 42565 in the Slate PLC:

Trying to read the register  42565 in the Slate PLC and Delta-V diagnostics return the error message "Illegal data address"

Seems like both are connected , but Delta-V is not being succesfull to read the address 42565

Does someone know what to do in this case ?.

Thanks,

Roberto Okuda

1 Reply

  • Roberto, just thinking out loud...
    I guess the adress specified is correct. However...
    You specify a string with size of 6 bytes. You read a 16 bits unsigned integer so only 2 bytes.
    The difference in byte size may cause the problem...
    Please, try an adress numerically 1 higher or lower, try a number of 6 bytes, try ...
    Hope this helps. Good luck!