Description Of Stop B - Siemens SINUMERIK 840D sl Function Manual

Safety functions integrated in the system/drive
7.3 Safe Stops A-F
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.
Deactivating 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_ENABLE, then
during an external STOP A, the SBH/SG monitoring is internally deactivated, independent of
how the external stop was requested.
This can be done as follows:
●
● "Parking axis" requested or active
● External STOP A from another 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 monitoring
available at the SGE becomes immediately active.
7.3.3

Description of STOP B

Action in the drive monitoring channel:
The drive is braked along the OFF3 ramp by entering a speed setpoint = 0. If the speed actual
value falls below the value entered in p9560 "SI Motion pulse cancellation shutdown speed",
or timer p9556 "SI Motion delay time expired", then a transition is automatically made into
STOP A.
Action in the NCK monitoring channel:
Analogous to the drive, the control system enters speed setpoint = 0 and when the value in
MD36960 $MA_SAFE_STANDSTILL_VELO_TOL is fallen below, or after timer MD36956
$MA_SAFE_PULSE_DISABLE_DELAY expires, then a transition is automatically made into
STOP A.
Alternatively, braking can be realized drive-based along the OFF3 ramp (see Chapter "Braking
response for STOP B/C (Page 123)").
If the timer in MD36956 $MA_SAFE_PULSE_DISABLE_DELAY or P9556 "SI Motion pulse
cancellation delay time" is set to zero, then for a STOP B an immediate transition is made into
a STOP A.
120
Selection via SGE "Deselect ext. STOP A"
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated