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M94 Turn PLC request bit on
Centroid CNC12 Acorn M-code · Mill and lathe
Turns on M request bit 1 to 128 for the PLC. The PLC program decides which output it drives. Motion stops before the bit changes.
Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.
Format
Addresses
| Address | What it does |
|---|---|
bit | Request bit number 1 to 128, after a slash |
How it works
Modal. The bit stays on until M95.
Example program
M103 /4.5 ; 4.5 SECOND TIMER
M100 /4 ; WAIT FOR INPUT 4 TO OPEN
M104 ; CANCEL TIMER
Example is in inch. Check offsets and clearances first.
Watch out for
- Bits 1 to 5, 15 and 16 are used by M3 to M11, M39 and M6. Do not reuse them.
- What each bit does depends on the builder PLC program.
Machine builders set many M codes, and they change by model and options. Check the M code list for your machine.
Related codes
M94 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Haas NGC | Axis position capture stop |
| Doosan (Fanuc) | External m-code m94 |
| Heidenhain TNC (ISO) | Reduce rotary axis display under 360 |
| Fadal | Feed forward on |
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