AC800M ModbusTCPIP word
Hi this is my problem:
I talk with 3th part system without problems for tags "real" and "dint" but if I try to use "word" I can't read nothing and the fb MBTCPReadCyc give me
If, for this specific register, I change the tag "word" and use a "real" I have not error!
But my 3th part sends me a word!!
Thanks for support!
I know from experience that the serial modbus from the AC800M is very strict in what it expects to receive and I expect the modbus tcp to be the same. You say that a real (32bit value) works and a word (16bit value) doesn't work. I think it will work if you use a dword (32bit value). I had a problem with serial modbus AC800M where the other party was sending a word for a boolean value. The AC800M would refuse the value and I had to use a word and some logic to turn into a boolean.