PLC Fault

[Buzzsawstanley]

I am in the Pharma industry and have a Clean in Place (CIP) Skid that utilizes a Siemens PLC and Paragon Process Control System. I CIP system keeps giving me a fault error in the same step in the process and I can't figure it out. Anyone have any similar experiences.
Thanks
Stan

[Ste]

What PLC is it?
Have you the programming software and interface leads?
Does the PLC go to STOP or does the machine just stop its cycle.
If the machine is stopping it's cycle then it is probably a sensor/switch error