Siemens Sinumerik 840D sl Function Manual page 117

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Note
If safely reduced speed was not active prior to the selection of SBH, any moving
axis/spindle is stopped with STOP B/A.
The actual status of the function is displayed using the SGA "SBH active".
The SGEs and SGAs are described in Chapter 7.1 "Safety--related input/output
signals (SGE/SGA)".
Internal control request for SBH
When the SG or SE responds (STOP C, D, E) the drive is internally switched to
the safe operating stop state in the control. In such cases, the external circuit of
the SGEs (SBH/SG deselection and SBH deselection) is ignored and both are in-
ternally set to "0".
Selecting SBH from SG
The changeover from safely reduced speed to safe operating stop is initiated using
the SGE "SBH deselection". A delay time that is parameterized in the following
machine data is simultaneously started with the changeover to SBH (signal "SBH
deselection"=0):
for 840D sl
MD36951 $MA_SAFE_VELO_SWITCH_DELAY
for SINAMICS S120
p9551 SI Motion SLS(SG) changeover delay time (Control Unit)
SBH is activated as soon as the delay time expires.
Note
If the SBH function is selected while an axis/spindle is moving, the machine
manufacturer must initiate the braking process such that the axis/spindle is in
position -- i.e. stationary -- after the delay time has expired. This can be performed
automatically using the "setpoint speed limiting" function. If the axis moves out of
the standstill tolerance window after the delay has expired, an alarm is generated
(for 840D sl: 27010, for SINAMICS S120: F01707) and STOP B/A initiated!
© 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
6.2 Safe operating stop (SBH)
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