10222

Review the NC program at the alarm location and identify all WAIT MARKG and GET commands with their channel references.

Verify that each WAIT MARKG in one channel has a corresponding GET command in the target channel with matching marker identifiers and correct channel numbers.

Check that the channel identifier syntax is correct (e.g., WAITM(2,1) waits for channel 2, marker 1) and matches your actual channel configuration.

Correct any syntax errors or mismatched pairs, ensure both channels reach their synchronization points, then reset the alarm and restart the program.

Access the channel overview screen and verify that all channels referenced in the synchronization commands are active and in a ready state (not RESET or disabled).

Check machine data MD10000 (ASSIGN_CHANNEL_TO_MODE) and related channel configuration MDs to confirm all required channels are properly defined and assigned.

If a channel was in RESET, activate it and ensure it can run independently before attempting synchronized operation.

Verify that no other alarms or error conditions exist in any of the channels that would prevent them from executing synchronization commands.

Perform a complete control power cycle (full power OFF/ON, not just NCK reset) to clear any internal communication buffers and reinitialize channel management.

Ensure machine is in a safe state and all programs are saved before power cycling.

Check the NCK diagnostic buffer for any preceding communication errors, buffer overflow messages, or system resource warnings that might indicate memory issues.

Review cycle times and program structure for excessive synchronization frequency; simplify or add delays if channels are synchronizing in very tight loops (millisecond-level cycles).

If issue persists, backup all data and perform an NCK boot or consider loading a known-good archive. Contact Siemens support if the problem continues after these steps.

Always backup before performing boot operations.