txmudslinger
Member
We have some AB CompactLogix PLCs running a coal/dirt separating plant. When an operator when to crank the plant this morning there was no comm between computer & PLC... complete comm loss. Upon further investigation it was found that the program had just disappeared out of the PLC... I saw where there was a known issue with a specific firmware version losing the program on an i/o fault/power cycle situation but wondering if anyone else has seen this problem? A copy of the program was downloaded back to the PLC and everything was fine... What say ye?