How do I fix and clear Mazak alarm 921?

Correct the program so that the G29 command and the M independent command are contained in separate blocks.

CRITICALAlarm code

921

G29, M COMMANDS SAME BLOCK (WNo., NNo., BNo.)

Q: What does Mazak alarm 921 mean?

Mazak alarm 921 is "G29, M COMMANDS SAME BLOCK (WNo., NNo., BNo.)". An M independent command (M0, M1, M2 or M30) and the G29 command (start-position return) have been programmed in the same block. Error type: Registered Data — program or tool data error.

What it means

An M independent command (M0, M1, M2 or M30) and the G29 command (start-position return) have been programmed in the same block.

What to do

1Correct the program so that the G29 command and the M independent command are contained in separate blocks.

Codebook — decoded

BError typeRegistered Data — program or tool data error

I (L)Stop statusunspecified

O (S)Clearingunspecified

Still faulted after these steps? Do not restart under load — ask the Mazatrol assistant.

Still stuck? Ask the Mazatrol assistant →