Hi friends! Need some advice on AC500 Modbus communication..
working on Modbus serial communication using MOD_COM_Mast. I have AC500 plc that needs to talk to three third party drives. I have to write& read from 1797,1798 ( drives Modbus address for speed ref and cw resp. for all three drives) and also only read from modbus address 2049(drive modbus address for speed feedback from three drives). I can read and write on 1797 and 1798 but can't read from 2049. I have attached the program for your reference.
I tried to consolidate three modbus address in single MOD_Com_Mast but the number of words that it can read is over the limitation, fc 3 can only do 125 words. I created a separate MOD_COM_Mast for modbus address 2049 but it overwrites in two of the first modbus address (1797,1798) and also when i am online it doesn't respond at all.
(1797-2049 is 253 words)
How do i resolve this issue.. need your help please.
Everybody's enjoying thanksgiving, but i am here trying to figure out this problem.
Please have a look at the program and let me know what i am missing..
I would be so grateful.