Siemens SINUMERIK 840D Description Of Functions page 88

3 Safety-Related Functions
3.4 Safe operating stop (SBH)
Internal control When the SG or SE responds (STOP C or D), the drive is switched to the safe
operating stop state internally in the control. In such cases, the external circuit
request for SBH
state of the SGEs (SBH/SG de-selection and SBH de-selection) is ignored and
both are internally set to "0".
Selecting SBH The changeover from safely-reduced speed to the safe operating stop is
from SG initiated via the SGE "SBH de-selection". A delay time that is parameterized in
the following machine data is simultaneously started with the changeover to
SBH (signal "SBH de-selection"=0):
For 840D
For 611 digital
SBH is activated as soon as the delay time expires.
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SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Note
If a "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 via the SGA "SBH active".
The SGEs and SGAs are described in Chapter 3.9, "Safety-relevant
input/output signals (SGE/SGA)".
MD 36951:
MD 1351:
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 via the function "setpoint velocity limiting". If the axis
moves out of the standstill tolerance window after the delay has expired, an
alarm is generated (for 840D: 27010, for 611 digital: 300907) and STOP B/A
initiated!
$MA_SAFE_VELO_SWITCH_DELAY
$MD_ SAFE_VELO_SWITCH_DELAY
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11.03