We have a machine that keeps losing its program at random intervals; sometimes 2x-3x in a shift, sometimes will go over 1wk without issue. I had a hard time getting a new battery for it, took over a month. After receiving and replacing the battery it continued to lose its program, so I have a new PLC on order.
As I'm waiting for the new PLC to arrive (Micrologix 1763-L16AWA) I received a report from operators that the PLC loses its program every time they push a certain button. It's a button for a manual function that only gets used in one certain situation, not very often. I hear this and it sounds like nonsense. I've never heard or seen anything like it and my first instinct was to write it off, but i went to investigate nonetheless and found it to be absolutely true. It's a simple circuit: 120v>wire>button>wire>Digital Input. I tested for shorts, grounds, etc, nothing. All good. That digital input is bad, I tested by disconnecting the button and running a jumper from 120V to the input, and as soon as it sees that input it pukes the program.
Just curious if anyone else has seen this before. Total curveball for me.
As I'm waiting for the new PLC to arrive (Micrologix 1763-L16AWA) I received a report from operators that the PLC loses its program every time they push a certain button. It's a button for a manual function that only gets used in one certain situation, not very often. I hear this and it sounds like nonsense. I've never heard or seen anything like it and my first instinct was to write it off, but i went to investigate nonetheless and found it to be absolutely true. It's a simple circuit: 120v>wire>button>wire>Digital Input. I tested for shorts, grounds, etc, nothing. All good. That digital input is bad, I tested by disconnecting the button and running a jumper from 120V to the input, and as soon as it sees that input it pukes the program.
Just curious if anyone else has seen this before. Total curveball for me.