had an issue tonight, program was being lost in a micrologix 1500. reloaded it several times, every time it went out it was running, never while off.
the issue ended up being 24v power to a solenoid valves coil had come lose in the connection and was shortcircuited. this probably caused some kind of surge in the lines back to the plc, causing it to either clear its memory on its own for safety, or corrupting it where it wouldn't read as having anything in memory.
i saw the papers on using diodes to protect against surges, would these have any effect on an outputs wires grounding out and causing the program to wipe? i was thinking of pushing to get the time and resources to set up surge protection on all of the inductive load outputs just to be safe, but don't want to be wasteful either.
thanks.
the issue ended up being 24v power to a solenoid valves coil had come lose in the connection and was shortcircuited. this probably caused some kind of surge in the lines back to the plc, causing it to either clear its memory on its own for safety, or corrupting it where it wouldn't read as having anything in memory.
i saw the papers on using diodes to protect against surges, would these have any effect on an outputs wires grounding out and causing the program to wipe? i was thinking of pushing to get the time and resources to set up surge protection on all of the inductive load outputs just to be safe, but don't want to be wasteful either.
thanks.