F37895 — HF Damping Module (CU): Alternating cyclic data transmission error

F37895 — HF Damping Module (CU): Alternating cyclic data transmission error is raised when the Control Unit detects a DRIVE-CLiQ communication error on the connection from the HF Damping Module: the alternating cyclic data exchange between the two has slipped out of step. The manual pins the condition down precisely as fault cause 11 (= 0B hex), a synchronization error during the alternating cyclic data transfer. The component number of the reporter is coded into the message value, which you can read out in r0949 or r2124.

• A DRIVE-CLiQ communication error has occurred on the link from the HF Damping Module to the Control Unit.
• The fault cause reported with this code is 11 (= 0B hex): a synchronization error during the alternating cyclic data transfer.

1. Read the fault value in r0949 (or r2124); the yy byte of the coded value names the component that reported the error.
2. Carry out a POWER ON — this is the only remedy the manual gives for this code.

• The message value carries two items: the component number and the fault cause.
• The manual decodes the value stored in r0949/r2124 as 0000yyxx hex: yy = component number, xx = error cause — the upper byte yy holds the component, the lower byte xx the cause.
• For this fault the cause byte reads 0B hex (decimal 11), the synchronization error during alternating cyclic data transfer described above.

• r0949 (fault value): read out the coded message value of this fault here — component number in the yy byte, fault cause 0B hex in the xx byte.
• r2124 (alarm value): holds the same coding; the manual names it together with r0949 for the message value of this fault.

The drive takes no automatic action when this fault occurs; it only records and signals it. After carrying out the POWER ON, acknowledge the fault immediately — the manual specifies acknowledgement without delay. No further reset steps are described for this code.