Heidenhain M-codes: reference table

Mon, 01 Jan 0001 00:00:00 +0000

M-codes, called miscellaneous functions on Heidenhain controls, switch machine functions such as the spindle, coolant, and program run. Some of them are machine-dependent and defined by the machine tool builder; the manual of your specific TNC control describes their exact behavior.

Essential M-codes

These are the M-codes you will use most often in day-to-day work on a Heidenhain control.

Code	Description
M03	Spindle ON clockwise
M05	Spindle STOP
M08	Coolant ON
M09	Coolant OFF
M30	Same function as M02 (end of program)
M91	In the positioning block: coordinates refer to the machine zero point
M92	In the positioning block: coordinates refer to a position defined by the machine manufacturer, e.g. the tool change position
M94	Reduce the rotary axis display to a value below 360°
M99	Blockwise cycle call
M116	Feed rate for rotary axes in mm/min
M126	Shortest-path traverse of rotary axes
M128	Maintain the position of the tool tip when positioning tilting axes (TCPM)
M129	Reset M128
M130	In the positioning block: points refer to the untilted coordinate system
M136	Feed rate F in millimeters per spindle revolution
M137	Reset M136
M140	Retract from the contour in the tool axis direction
M150	Suppress limit switch message

Full reference

All M-codes at a glance, sorted by number.

Heidenhain code numbers (TNC 530)

Mon, 01 Jan 0001 00:00:00 +0000

Code numbers work like passwords: entering them on the control unlocks additional settings and functions. The list below applies to the TNC 530 control generation.

For trained service personnel only

Code numbers unlock service-level functions of the TNC 530. Changes to machine parameters, the PLC program, or the kinematics can damage the machine and are intended exclusively for trained service personnel.

Heidenhain control: M-codes and code numbers on CNC-Master

Heidenhain M-codes: reference table

Essential M-codes

Full reference

Heidenhain code numbers (TNC 530)