whats up guys first post here been having trouble with a plc out in the field that keeps faulting with "a rack data error is detected check slot 2" it has been happening since its instalation about 2 years ago weve even gone as far as replacing the plc entirely and still get the same fault. Funny thing is after replacing the plc it didnt fault for about 6 months or so now its back to its normal faulting and its quite irritating.