Siemens SINUMERIK 828D Function Manual page 313

Clamping torque greater than 100%
Values greater than 100% are only practical for a short time for SD43510 $SA_FIXED_STOP_TORQUE.
Irrespectively, the maximum torque is limited by the drive.
For example, the following drive machine data have a limiting effect:
p1520/p1521 upper torque limit/force limit / lower torque limit/force limit
p1522/p1523 upper torque limit/force limit / lower torque limit/force limit
p1530/p1531 power limit, motoring / power limit, regenerating
p0640 current limit
p0326 motor stall force correction factor
Additional information can be found in the SINAMICS S120 Function Manual.
Status query in the parts program
System variable $AA_FXS[x] indicates the status of the "travel to fixed stop" function.
It has the following coding:
$AA_FXS=0
$AA_FXS=1
$AA_FXS=2
$AA_FXS=3
$AA_FXS=4
$AA_FXS=5
Query of the system variables in the part programs initiates a preprocessing stop.
As a result of the status query in the parts program, it is possible, for example, to react to an erroneous
operational sequence of the "Travel to fixed stop" function.
Example:
MD37050 $MA_FIXED_STOP_ALARM_MASK = 0
⇒ No alarm is generated in response to an error. A block change therefore takes place and the error scenario
can be evaluated via the system variable
Program code
X300 Y500 F200 FXS[X1]=1 FXST[X1]=25 FXSW[X1]=5
IF $AA_FXS[X1]=2 GOTOF FXS_ERROR
G01 X400 Y200
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Axis not located at the fixed stop.
Fixed stop has been approached successfully
(axis is within fixed stop monitoring window).
Approach to fixed stop has failed
(axis is not at fixed stop).
Travel to fixed stop activated.
Fixed stop detected.
Travel to fixed stop is deselected.
The deselection is not yet completed.
F1: Travel to fixed stop
6.2 General functionality
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