How do I fix and clear Mazak alarm 278?

Unless the special mode is required, set the relevant parameters to 0. Clearing procedure: Fix cause → Power OFF → Power ON.

ALARMSMazatrol Assistant

NOTICEAlarm code

278

MPG SPECIAL MODE SELECT

Q: What does Mazak alarm 278 mean?

Mazak alarm 278 is "MPG SPECIAL MODE SELECT". The special mode is selected on the manual pulse generator operating panel. 1. Cause code 1: All bits of RB90 are set to 1 (Mode for setting the operating panel in the unused state to connect the safety circuit). 2. Cause code 16: RB89 bit 3 is ON (pairing in progress). 3. Cause code 256: Another mode is selected. Error type: Machine (PLC) — machine failure. Machine state: Operation continued — machine still running.

What it means

The special mode is selected on the manual pulse generator operating panel. 1. Cause code 1: All bits of RB90 are set to 1 (Mode for setting the operating panel in the unused state to connect the safety circuit). 2. Cause code 16: RB89 bit 3 is ON (pairing in progress). 3. Cause code 256: Another mode is selected.

What to do

1Unless the special mode is required, set the relevant parameters to 0.

Codebook — decoded

FError typeMachine (PLC) — machine failure

LStop statusOperation continued — machine still running

NClearingFix cause → Power OFF → Power ON

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

Still stuck? Ask the Mazatrol assistant →