Okuma Alarm-A 1221 Duplicate M-code
Before the execution of an M code, another M code which belongs to the same M-code group is designated (M07/M08, and so forth).
(In the case of process-combined machining such as thread cutting, this error occurs when the program is read and stored in the buffer.)
Designated M-code group
(“M08” is displayed in the case of M08/M09.)