SLC 5/03 Error 56h

Hey all, I am having some trouble with a SLC 5/03 processor with a 13 slot rack. It goes into a fault everytime I set it to run. The fault code is 56h.

The description is "The rack configuration specified in the user program is detected as being incorrect."

I have tried setting up a new program to read the I/O config but all it gives me is an invalid rack configuration error.

Any ideas? I am leaning towards the rack itself currently as I have tried another processor and it gave me the same fault trying to read the configuration.

Have you tried to set it up manually? Then reload the program.

More...

Sometimes unseating and reseating the cards helps. ( power down of course)

Tried reseating all the cards, while the power was off, I can try reloading them all manually. I cleared the CPU memory and reloaded the program but it came up with the same thing.

Was this a working system that just went bad? Or new/used?

It does point to the rack.

It was a running system. It is a food packaging machine so possibly the PLC got wet.

I ended up changing out the rack and it took off after that. Of course we only had a 10 slot rack to replace the 13 slot rack. Luckily it only used 9 cards. Only had to reconfigure the outputs for one card.

Anywho, thanks for taking the time to help out. I appreciate it.

Thanks for letting us know the solution.

And welcome to the forum.