harryting
Lifetime Supporting Member
I'm also planning on a call to Rockwell in the morning. Meanwhile, I'm here to see if anyone seen anything like this but i don't have much hope since this is a weird one.
key facts: system with multiple Logix PLC, L62, L72, etc... running for years. No one was around at the time and no power bumps that we know of.
What happened: not one but two PLC chassis locked up, also, one redundant system lost sync and the backup chassis PLC (2 of them) lost their program.
When I say chassis locked up, I mean I can ping to the network card but can't see the backplane on RSLinx and OPC can't talk to the PLC.
We cycled power on the chassis and got them back up. Getting the redundant PLC back in sync was much harder but eventually we got it with some help with RA phone support.
Now everything is running but we are still getting OPC comm error on our HMI once a while. we didn't used to get these OPC comm error before the whole incident and it's having me on the edge a bit. I also never seen a chassis, not to mention two chassis that locked up like this. All the lights on the PLC seems fine when the chassis locked up too. It seems there are still some issue with the Chassis as we are getting intermitten comm error from the OPC.
add1: I see some task watchdog warning as the task runs over the period (set at 20ms but runs over 20ms sometime in task monitor) but I dont' believe that's a big deal?
add2: we see "battery alarm" on the L61 PLC once we get them back online in RSLogix and "energy storage alarm" on the L72 but locally at the PLC, no fault LED light are lit for those. Both went away later.
I shall update when I remember or find out more.
key facts: system with multiple Logix PLC, L62, L72, etc... running for years. No one was around at the time and no power bumps that we know of.
What happened: not one but two PLC chassis locked up, also, one redundant system lost sync and the backup chassis PLC (2 of them) lost their program.
When I say chassis locked up, I mean I can ping to the network card but can't see the backplane on RSLinx and OPC can't talk to the PLC.
We cycled power on the chassis and got them back up. Getting the redundant PLC back in sync was much harder but eventually we got it with some help with RA phone support.
Now everything is running but we are still getting OPC comm error on our HMI once a while. we didn't used to get these OPC comm error before the whole incident and it's having me on the edge a bit. I also never seen a chassis, not to mention two chassis that locked up like this. All the lights on the PLC seems fine when the chassis locked up too. It seems there are still some issue with the Chassis as we are getting intermitten comm error from the OPC.
add1: I see some task watchdog warning as the task runs over the period (set at 20ms but runs over 20ms sometime in task monitor) but I dont' believe that's a big deal?
add2: we see "battery alarm" on the L61 PLC once we get them back online in RSLogix and "energy storage alarm" on the L72 but locally at the PLC, no fault LED light are lit for those. Both went away later.
I shall update when I remember or find out more.
Last edited: