I have problem in MMS communication between controller AC800M pm866 and pm864 suddenly communication is stopped .i have attached the program ,controller analyis and controller log please give suggestions for this problem to resolve...
Assuming that this all used to work correctly and you changed nothing ? Did a CPU crash, network fail etc ?
To restart, you should toggle the EN parameter of the MMS connect block. Do not connect the EN terminal to a constant - always connect it to a cold retain variable ( initial value = true ) so you can toggle this if required.
The MMS Read Cyclic should only be enabled if the MMC Connect Block is Valid / No Error.