AC 800M Modbus Slave ch3 ver. 6.0
Hi .
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 ....
Answers
Greetings,
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.
Hello,
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.
Hi ..
Yes Q is that AC800M working Slave by Controller ch3-port .... with 232/485 modens by 4 wire system ....
How settings should be done ...
You only need to set up access variables and configure the com3 port for ModBus.
Syntax is for Holding Registers "%MW10#0" = first Register -- equals address 40001 in a master simulator like ModScan. "%QX10#0" = first Coil -- equals address 1
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