F01055 — CU: Internal error (SYNO of port and application not identical)

F01055 is an internal error of the CU: the SYNO clock cycle of a port and the SYNO clock cycle of an application are not identical. All applications that operate with slaves at one port must be derived from the same SYNO clock cycle. The first application whose registration (log-on) connects a slave to a port defines the SYNO clock cycle that is used as the basis for this port; the fault is raised when an application at the port does not match that clock cycle. The entries that describe this message carry the same cause and add: Only for internal Siemens troubleshooting.

• All applications that operate with slaves at one port must be derived from the same SYNO clock cycle — the CU has detected an application at a port whose SYNO clock cycle differs from the one the port is based on.
• The SYNO clock cycle of a port is fixed by the first application whose registration (log-on) connects a slave to that port; an application that comes onto the port afterwards must match this clock cycle.

1. Read the fault value in r0949 and note the Method ID it contains (the manual specifies to interpret the value hexadecimal).
2. Contact Technical Support and quote the Method ID; the manual names no remedy that can be carried out on the converter itself.

• The message value (%1) is the Method ID. The drive stores it in r0949, and the manual specifies to interpret this value hexadecimal. No bit-level decoding is printed for this fault value.

• r0949 — fault value: holds the Method ID for this fault; read and note it (interpret hexadecimal) before contacting Technical Support.

The drive does not trip on this fault. Acknowledging clears the message but not the underlying condition: the only remedy the manual names is to contact Technical Support, and the fault is explicitly marked Only for internal Siemens troubleshooting. No parameter change or on-site procedure is described for eliminating the clock-cycle mismatch.