Christoff84
Lifetime Supporting Member + Moderator
Hey all,
Recently one of my SLC 5/04's (L542B) has started losing its sequence when it's powered off. Until recently the system could be powered down and back up again without issue. I've looked at all the coding and the areas effected are all latch/unlatch instructions.
This is really stumping me, no program changes have been made to this area of the program and other PLCs in the plant don't seem to lose their place. We are in an area extremely prone to power outages and surges so this is coming somewhat of a severe issue.
Any ideas?
Recently one of my SLC 5/04's (L542B) has started losing its sequence when it's powered off. Until recently the system could be powered down and back up again without issue. I've looked at all the coding and the areas effected are all latch/unlatch instructions.
This is really stumping me, no program changes have been made to this area of the program and other PLCs in the plant don't seem to lose their place. We are in an area extremely prone to power outages and surges so this is coming somewhat of a severe issue.
Any ideas?