tlf30
Lifetime Supporting Member
Hello everyone,
First I want to clarify, I am not actually installing an external watchdog timer on any equipment. I was drinking my coffee this morning remembering a heater project I commissioned, and I recalled that the panel had an external watchdog timer connected to the CompactLogix plc. The watchdog timer was built by AB, and I cannot remember how it was wired or really what the function of it was.
So I was wondering if anyone here has implemented an external watchdog on a PLC, and if so, what timer did you use and how was it implemented? Did it simply trigger an ESD, did it reboot the PLC? I'm curious as to how an external watchdog is normally implemented.
Thanks,
Trevor
First I want to clarify, I am not actually installing an external watchdog timer on any equipment. I was drinking my coffee this morning remembering a heater project I commissioned, and I recalled that the panel had an external watchdog timer connected to the CompactLogix plc. The watchdog timer was built by AB, and I cannot remember how it was wired or really what the function of it was.
So I was wondering if anyone here has implemented an external watchdog on a PLC, and if so, what timer did you use and how was it implemented? Did it simply trigger an ESD, did it reboot the PLC? I'm curious as to how an external watchdog is normally implemented.
Thanks,
Trevor