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CHAPTER 15. M CODES
15.6
152
M50: Feed Override Control
To enable the feedrate override switch, program M50 or M50 P1. To disable the switch program M50
P0. While disabled the feed override will have no influence, and the motion will be executed at
programmed feedrate. (unless there is an adaptive feedrate override active).
15.7
M51: Spindle Speed Override Control
To enable the spindle speed override switch, program M51 or M51 P1. To disable the switch program
M51 P0. While disabled the spindle speed override will have no influence, and the spindle speed will
have the exact program specified value (using the S-word as described in 17.2).
15.8
M52: Adaptive Feed Control
To use an adaptive feed, program M52 or M52 P1. To stop using adaptive feed, program M52 P0.
When adaptive feed is enabled, some external input value is used together with the user interface
feed override value and the commanded feed rate to set the actual feed rate. In EMC2, the HAL pin
motion.adaptive-feed is used for this purpose. Values on motion.adaptive-feed should range
from 0 (feed hold) to 1 (full speed).
15.9
M53: Feed Stop Control
To enable the feed stop switch, program M53 or M53 P1. To disable the switch program M53 P0.
Enabling the feed stop switch will allow motion to be interrupted by means of the feedstop control.
In EMC2, the HAL pin motion.feed-hold is used for this purpose. Values of 1 will cause the
motion to stop (if M53 is active).
15.10
M62 to M65: Digital IO Control
To control a digital output bit, program M- P-, where the M-word ranges from 62 to 65, and the
P-word ranges from 0 to an implementation-defined maximum.
M62 Turn on digital output synched with motion
M63 Turn off digital output synched with motion
M64 Turn on digital output immediately
M65 Turn off digital output immediately
15.11
M100 to M199: User Defined Commands
To invoke a user-defined command, program M- P- Q- where P- and Q- are both optional. The
external program “Mnnn” in the directory [DISPLAY]PROGRAM_PREFIX is executed with the P and Q
values as its two arguments. Execution of the RS274NGC file pauses until the invoked program
exits.
It is an error if
• The specified User Defined Command does not exist