Comms intermittently dropping off on AC450/CI5700 Masterfield Bus
AC450 - CI570 - TC570 - DSCT452 - Tyrak 8L
We have 3 Buses, but only use 1 and 3. 2 is still connected and enabled. Nodes were moved from Bus 2 to Bus 3 many years ago.
We are currently experiencing intermittent problems with communication between our Tyrak 8L DC drives and the Ac450 masterfieldbus.
I find that all the Nodes on the TC570 Masterfieldbus connection unit have turned off. They come back on by themselves after a few minutes.
Checking on the AC450 PLC I see the Masterfieldbus Error Counter and Communication by typing #LMFS
I can see all the nodes have turned off on the Buses. Also there is a error counter value. Noticed that Bus 3 error counter is larger than 1 by quite a lot.
I replaced the CI570 card in Bus 1.
Problem occurred again, but the Nodes on Bus 1 were ok. Bus 3 Nodes only turned off this time.
I have now put the original CI5700 card into Bus 1 and the new card into Bus 3. Waiting to see the result.
I am also thinking of disabling Bus 2 as we are not using anyway.
Any thoughts as to what might be causing the problem?
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