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M103 Start action timer
Centroid CNC12 Acorn M-code · Mill and lathe
Starts a timer in seconds. If M104 does not cancel it in time, the job is canceled with a timer expired message.
Format
M103 /seconds
Addresses
| Address | What it does |
|---|---|
seconds | Time limit after a slash |
How it works
One shot.
Example program
M94 /12 ; TURN ON REQUEST 12
M103 /4.5 ; 4.5 SECOND TIMER
M100 /4 ; WAIT FOR INPUT 4
M104 ; CANCEL TIMER
M103 /4.5 ; 4.5 SECOND TIMER
M100 /4 ; WAIT FOR INPUT 4
M104 ; CANCEL TIMER
Example is in inch. Check offsets and clearances first.
Watch out for
- Use it with M100 or M101 so a missing signal cannot hang the machine.
Machine builders set many M codes, and they change by model and options. Check the M code list for your machine.
Related codes
M103 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Doosan (Fanuc) | Right spindle forward rotation |
| Mazak (EIA) | Workpiece measurement STP end |
| Heidenhain TNC (ISO) | Reduce feed when plunging |
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