Siemens Sinumerik 840D sl Function Manual page 131

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SGE deselect external STOP A
"Pulse cancellation" can be requested and executed using this SGE.
The safety functions currently active (SG/SBH/SN/SE) are not influenced by this
SGE, unless function "Deactivate SBH/SG monitoring during an external STOP A"
is enabled.
If one of the currently active limits is violated, an appropriate alarm is initiated. The
associated shutdown response cannot be activated because the pulses have
already been cancelled. As soon as the stop request is cancelled via the SGE
"deselect ext. STOP A" any queued shutdown responses become active.
If a stop request is active, SGA "STOP A/B active" is set in the same way as it
would be for an internally triggered STOP A.
MD36977 $MA_SAFE_EXT_STOP_INPUT[0] is used to define the selection/
deselection of the external brake request, in this case, "deselect external STOP A"
(SH, pulse cancellation).
An external STOP A is also activated if the "Parking axis" function is selected.
Deactivate SBH/SG monitoring during external STOP A
In order to avoid that an axis, whose the pulses have been canceled, violates a
limit value as a result of SBH or SG monitoring, users can use the "Deactivate
SBH/SG monitoring during an external STOP A" function.
If this function is enabled using bit 23 in MD36901 $MA_SAFE_FUNCTION_ENA-
BLE, then during an external STOP A, the SBH/SG monitoring is internally deacti-
vated, independent of how the external stop was requested. This can be done as
follows:
S Selection via SGE "deselect ext. STOP A"
S "Parking axis" requested or active
S External STOP A from other monitoring channel
SBH/SG monitoring is also deactivated, if, during an external STOP A, an internal
STOP A is active -- or becomes active.
Immediately after deselecting the external STOP A, the velocity or standstill moni-
toring available at the SGE becomes immediately active.
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Safety functions integrated in the system/drive
6.3 Safe Stops A- -F
6-131