Siemens SINUMERIK 840D sl Programming Manual page 978

Work preparation
3.21 Extended stop and retract (ESR)
Note
The positions programmed with POLF and the activation by POLFMASK or POLFMLIN are
deleted when the part program is started. This means that the user must reprogram the values
for POLF and the selected axes in POLFMASK or POLFMLIN in each part program.
Note
If, when using the abbreviated form POLFA only the type is changed, then the user must ensure
that either the retraction position or the retraction path contains a practical and sensible value.
In particular, the retraction position and the retraction path have to be set again after Power On.
Example
Retracting an individual axis:
Program code
MD37500 $MA_ESR_REACTION[AX1]=21
...
$AA_ESR_ENABLE[AX1]=1
POLFA(AX1,1,20.0)
$AA_ESR_TRIGGER[AX1]=1
Further information
Requirements for NC-controlled retraction
● A retraction axis is configured for the NC-controlled retraction in the channel:
MD37500 $MA_ESR_REACTION = 21
● ESR must be must be enabled for this axis:
$AA_ESR_ENABLE = 1
● Delay times are defined:
MD21380 $MC_ESR_DELAY_TIME1
MD21381 $MC_ESR_DELAY_TIME2
● The axis-specific retraction positions have been configured with POLF in the part program.
● The axes are selected with POLFMASK/POLFMLIN for the NC-controlled retraction.
● The activate signals must be set for the retraction movement and remain set.
Enable and start NC-controlled reactions
If system variable $AC_ESR_TRIGGER = 1 is set and if a retraction axis is configured in this
channel (i.e. MD37500 $MA_ESR_REACTION = 21) and $AA_ESR_ENABLE = 1 is set for this
axis, then rapid lift (LIFTFAST) is activated in this channel.
The lift movement configured with POLF (or POLF) for the axes selected with POLFMASK or
POLFMLIN replaces the path motion defined for these axes in the part program.
978
Comment
; NC-controlled retraction.
; AX1 is assigned the axial retraction
position 20.0 (absolute).
; Retraction starts from here.
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming