GE VersaMax PLC User Manual page 96

A checksum calculation is performed on the application program at the end of every sweep. You can
specify from 0 to 32 words to be checksummed. If the calculated checksum does not match the
reference checksum, the program checksum failure exception flag is raised. A fault is entered in the
PLC fault table and the PLC goes to Stop mode. If the checksum calculation fails, the programmer
Diagnostics
communications window is not affected.
Each sweep, the CPU verifies the physical configuration of one module against its programmed
configuration. A missing, additional, or mismatched module causes a fault to be generated.
96 GFK-1503E
For public disclosure
Parts of the CPU Sweep (continued)
VersaMax PLC User Manual