CNC Machinist Calculator UltraHome › M-codes › Siemens 840D 828D › M1
M1 Optional stop
Siemens 840D 828D M-code · Mill and lathe
Stops the program like M0 only when the optional stop switch is on. Otherwise it is ignored.
Format
M1
How it works
Non modal.
Example program
G0 Z100 M5 ; END OF TOOL 1
M1 ; OPTIONAL STOP
T2 D1
M1 ; OPTIONAL STOP
T2 D1
Example is in inch. Check offsets and clearances first.
Watch out for
- Put M1 before each tool change so the operator can check the first part tool by tool.
Machine builders set many M codes, and they change by model and options. Check the M code list for your machine.
Related codes
M1 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Optional stop |
| Haas NGC | Optional stop |
| Doosan (Fanuc) | Optional program stop |
| DMG Mori MAPPS (Fanuc) | Optional stop |
| Mazak (EIA) | Optional stop |
| Okuma OSP | Optional Stop (Lathes & Mills) |
| Mitsubishi M70 M80 | Optional stop |
| Brother Speedio | Optional stop |
| Heidenhain TNC (ISO) | Optional program stop |
| Fagor 8055 8065 | Optional stop |
| LinuxCNC Tormach | Optional pause |
| Mach3 Mach4 | Optional stop |
| Centroid CNC12 Acorn | Optional stop |
| Hurco WinMax (NC) | Optional stop |
| Fadal | Optional stop |
| Swiss (Citizen Star) | Optional stop |
Every M-code for Siemens 840D 828D in your pocket. The app has the full example programs, search by number or shop word, a line decoder and calculators for tapping, threading and drilling.
Open M1 in the app All Siemens 840D 828D M-codes