Siemens SINUMERIK 840D sl Function Manual page 108

Safety integrated

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Safety functions integrated in the system/drive

7.2 Safe Operating Stop (SBH)

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 "Safety-related input/output signals

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 internally 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):

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.

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

Function Manual, 12/2017, 6FC5397-4BP40-6BA1

Safety Integrated