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M121 Built in M code relay 1 with M-Fin
Haas NGC M-code · Lathe
Turns on built in relay 1, pauses the program and waits for an external M-Fin signal. When the signal comes the relay turns off and the program goes on.
Format
M121
How it works
Non-modal. Waits for M-Fin.
Example program
M121 (RUN ACCESSORY, WAIT FOR FINISH SIGNAL)
G00 X2. Z.1 (CONTINUE AFTER M-FIN)
M30 (END)
G00 X2. Z.1 (CONTINUE AFTER M-FIN)
M30 (END)
Example is in inch. Check offsets and clearances first.
Watch out for
- RESET ends a program that is hung up waiting for M-Fin.
- Check the wiring to the accessory. A missing M-Fin stops the program.
Related codes
M121 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Doosan (Fanuc) | Lower z2-axis torque control on |
| DMG Mori MAPPS (Fanuc) | External output |
| Centroid CNC12 Acorn | Open data file, append |
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