lalion
Member
Hi, ive been having problems with existing messaging system on a dh-485 network with 4 SLC5/03 plc's.
The system has been in place running happily for years but this morning we found that 2 of the plc's would no longer talk via their rj45 port, I ended up replacing with 2 spare cpu's.
Now I can communicate with all plc's over network again with rslinx, but I have found that 2 MSG instructions on 1 of the plcs (one i didnt have to replace) is now no longer working, with error code 37 "Message timed out in local processor" on read msg instruction, and error 7 "Target Node does not respond" on write MSG, find screenshots attached.
Also I have noticed that neither EN or DN bits are energizing on the MSG rung when im online, even when using a manual toggle bit to trigger msg instruction, but S:2/7 "outgoing msg pending" bit is staying high on the SVC instruction rung.
Does anyone have any ideas of what might be happening or can give advice on things to try?
Thanks, leon
The system has been in place running happily for years but this morning we found that 2 of the plc's would no longer talk via their rj45 port, I ended up replacing with 2 spare cpu's.
Now I can communicate with all plc's over network again with rslinx, but I have found that 2 MSG instructions on 1 of the plcs (one i didnt have to replace) is now no longer working, with error code 37 "Message timed out in local processor" on read msg instruction, and error 7 "Target Node does not respond" on write MSG, find screenshots attached.
Also I have noticed that neither EN or DN bits are energizing on the MSG rung when im online, even when using a manual toggle bit to trigger msg instruction, but S:2/7 "outgoing msg pending" bit is staying high on the SVC instruction rung.
Does anyone have any ideas of what might be happening or can give advice on things to try?
Thanks, leon