Siemens SINUMERIK 840D sl Function Manual page 91

Part program blocks without path motion (e.g. M82/M83) interrupt continuous-path mode and
thus also the "Look Ahead" function.
Example:
The part program blocks N320 and N420 are inserted in the programming example used.
Program code
N100 G0 X0 Y0 Z0 A0 G90 G54 F500
N101 G641 ADIS=.1 ADISPOS=5
N210 G1 X10
N220 G1 X5 Y20
N310 G0 Z50
N320 M82
N410 G0 A90
N420 M83
N510 G0 X100
N520 G0 Z2
N610 G1 Z-4
N620 G1 X0 Y-20
The function behaves as follows:
● MD36052 $MA_STOP_ON_CLAMPING = 'H03'
No longer has an effect.
The travel command is set in Look Ahead mode only for blocks with active continuous-path
mode. M82 generates a stop and thus interrupts the continuous-path mode. The Look
Ahead stopping on N410 would not be necessary because stopping occurs anyway.
● MD36052 $MA_STOP_ON_CLAMPING = 'H04'
Generates a stop irrespective of M83 which is executed as a function of "feedrate override
0%". The axis is thus stopped before the first machining block.
Note
MD36052 $MA_STOP_ON_CLAMPING = 'H01' or 'H04'
Both functions can be used irrespective of the clamping of axes:
● MD36052 $MA_STOP_ON_CLAMPING = 'H01'
● MD36052 $MA_STOP_ON_CLAMPING = 'H04'
Both functions ensure that the path motion in continuous-path mode is already stopped
before the start of the relevant part program block and not just within the part program block.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Generates a Look Ahead stop for the path motion if no servo enable signal is active for
the relevant axis.
Generates a Look Ahead stop for the path motion if the feedrate override = 0% at the
transition from the part program blocks with rapid traverse to part program blocks without
rapid traverse.
A3: Axis Monitoring, Protection Zones
3.2 Axis monitoring functions
Comment
; Machining
; Retract
; No path motion
; Turn rotary table
; No path motion
; Approach
; Machining
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