SI Motion CU: Checksum error safety monitoring functions

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The checksum calculated by the drive for safety-relevant parameters (r9728) does not match the reference checksum (p9729) saved during the last machine acceptance. This indicates that safety-relevant parameters have been altered or an internal fault is present, compromising the integrity of the safety monitoring functions. This fault results in a STOP A that can be acknowledged.

• Accidental or unauthorized modification of safety-relevant parameters (e.g., P9700, P9701) after machine acceptance.
• Data corruption in the non-volatile memory of the Control Unit (CU) storing safety parameters.
• Firmware update on the Control Unit that affects safety parameter storage without re-acceptance.
• Incorrect procedure for saving or restoring safety-relevant parameters, leading to mismatch between r9728 and P9729.

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1. 1

   Access safety parameters (e.g., P9700) using STARTER or TIA Portal and verify they match the last accepted machine configuration.

2. 2

   Perform a 'Safety Acknowledge' (e.g., P10_9700=2) to re-evaluate the safety checksums if no parameters were changed.

3. 3

   If parameters were intentionally changed, conduct a new safety acceptance test and save the new reference checksum (P9729).

4. 4

   Reload the last valid safety project (configuration and parameters) into the Control Unit from a backup.

5. 5

   If persistent, replace the Control Unit (CU) as its internal memory might be corrupted.