AC 800M Modbus Slave ch3 ver. 6.0
I like to know how to use / parametrize Modbus RTU for slave in ch3 ...
Manuals what I had find don't explain well ....
- slave connection to Access variables .... or should it use MBwrite / MBread functions ???
thank for good help ....
According to "AC800M Communication Protocols v6.02" document:
"A device with slave function is connected via a slave channel and its communication is controlled from a master channel."
So in my opinion you dont have to use MBWrite and MBRead functions, just declare the variables under Access Variables.
Hope it helps.
Correct me,if I am understanding the question wrongly.
I am assuming that you are talking about COM3 of controller.
I remember a simple 2,3,5 Modbus pin configuration worked very well for MBwrite & read blocks. You can cross check also,Communication between these two by using tools like MODSCAN.