Quick ML 1400 PLC Fault Q

If and when a PLC faults (front LED solid or blinking), is there a single bit that is enabled, or do I need to monitor all the bits listed in the processor\error tab, and latch a bit on if one of them is enabled, then unlatch if they're disabled on a clean power up?

I guess for my "PLC Fault" I use a relay output. Other methods might involve a "dead man bit" or even a counter or heartbeat. I'm sure there are other methods, but communications usualy fails for me on fault.