Okuma B2910/B2912 alarm: G code or M code not usable

Okuma OSP rejects a G-code or M-code not allowed in the current mode/program. It is an alarm from the Program area, and in the catalog it is listed as “G code or M code not usable”. On the machine you notice it like this: Falla en bloque concreto, Unrecognized or unusable code, Suele venir de post de otro control.

On the shop floor it almost always comes from one of these causes: Unsupported code, Modo incorrecto, Option not installed, A Fanuc post-processor used on OSP without adapting it. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset after correcting code/program. Resetting without fixing the cause first only hides the problem: Okuma B2910/B2912 trips again and, in the meantime, you keep working with the machine in bad shape.

With the machine stopped and in a safe state, start with these checks: Anotar bloque, Compare against the OSP manual, Revisar postprocesador. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Okuma B2910/B2912 active, avoid this: Do not bypass safety devices, Do not manipulate energized electrical cabinet, Do not continue producing if the alarm reappears. Skipping any of these points is what turns a minor stop into an expensive breakdown.

Yes the code should be supported and it does not appear as an option. If you are not sure how far it goes, stop the machine and report it: a repeat alarm always works out cheaper than a crash.

It is a stop alarm: the cycle will not continue until you fix the cause. It does not always mean serious damage, but it leaves the machine where it is and you have to check it before running again. Guidance reference. Always confirm the full text in the exact machine/control manual.