Safe Operating Stop (Sbh) - Siemens SINUMERIK 840D sl Function Manual

Safety functions integrated in the system/drive

7.2 Safe Operating Stop (SBH)

Prerequisites for the test stop
● At the start, the pulses must still be enabled; further, it is not permissible that SH is selected
at the start.
● For vertical (suspended) axes, the manufacturer must ensure that these are locked (to stop
them falling).
Note
The test stop can be carried out independently of the status of the standard pulse cancellation.
Message
The "test stop running" message is displayed during the "test stop".
7.2 Safe Operating Stop (SBH)
Description
The SBH function safely monitors the stop position (zero speed) of an axis/spindle in closed-
loop position or speed control.
When SBH is active (SGA "SBH active" = 1), operating personnel can, for example, enter
protected machine areas in the setting-up mode without first having to shut down the machine.
An incremental encoder is sufficient to implement this function. The actual position value is
monitored for a change.
In this case, the encoder coarse position must be taken into account for a 1-encoder system
(see Chapter "Actual value conditioning (Page 84)").
Functional features
The features of the SBH function are as follows:
● The axis remains in closed-loop control
● Parameterizable SBH tolerance window
● STOP B is the stop response after SBH has responded
Standstill tolerance
The standstill of the axis/spindle is monitored using an SBH tolerance window that is
parameterized using the following machine data:
For 840D sl:
MD36930 $MA_SAFE_STANDSTILL_TOL
For SINAMICS S120 :
106
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated