Cause : Checksum error safety monitoring functions comes when the actual checksum calculated by processor 2 and entered in r9398 over the safety-relevant parameters does not match the reference checksum saved in p9399 at the last machine acceptance. Safety-relevant parameters have been changed or a fault is present.

Fault value (r0949, interpret decimal):

0: Checksum error for SI parameters for motion monitoring.
1: Checksum error for SI parameters for component assignment.

- check the safety-relevant parameters and if required, correct.
- set the reference checksum to the actual checksum.
- execute the function "Copy RAM to ROM".
- perform a POWER ON if safety parameters requiring a POWER ON have been modified.
- carry out an acceptance test.