MOD 300, AC460 CI532V02 modbus RTU communication
I read the manuals about CI532V02 and AC460 controller, but i can't understand this module support only poin-to-point communication or it may be multidrop.
Please explain me can i use AC460 controller with the CI532V02, rs232/rs485 converter and connect it to several Modbus RTU slaves?
Thank for advance
Voted best answer
in general it will work.
There may be no official support for that. The Modbus multidrop function on AC460 was mainly build for using SHIM (Smart Hart Interface Module), but will work with PLC also. You should keep in mind that the Interface Speed is limited and using more than one slave will most likely result in more telegrams to be transmitted on the line. The number of output telegrams is limited to about 10 (pls. check manual) per second (in total not per PLC) everything more will definitely interfere with reading. Output telegrams will be some kind of asynch to reading. So every change on an output-FCM will trigger a write command following the current read.
So using multidrop you have to pay a special attention to the amount of data you want to transfer.
If you take all the in to account you have a pretty good chance to get it going.