Safe Stops A-F; General - Siemens SINUMERIK 840D sl Function Manual

Safety functions integrated in the system/drive

7.3 Safe Stops A-F

Time Explanation
t Time required to stop the axis for a STOP A.
9
Note:
Each axis must be measured during commissioning (start-up) to determine the distance that it travels between the limit value
being violated and it coming to a standstill.
7.3 Safe Stops A-F
7.3.1

General

Safe Stops are used to stop drive motion and bring it to a standstill. A distinction is made
between internal and external Stops. The internal stop responses, initiated by safety-related
functions when limit values are violated, initiate an alarm. The external stop responses selected
by SGEs do not issue an alarm and are acknowledged when the SGEs are deselected.
Stop responses SBH and SH
The following diagram shows the relationship between the stop responses and the Safe
Operating Stop (SBH) or the safe standstill (SH).
Figure 7-5
A high degree of security against faults/errors is afforded by the two-channel system structure
with its permanent, crosswise data comparison. Alarms and stop responses are initiated when
differences are detected between the two channels. The purpose of the stop responses is to
safely stop the drives in a controlled fashion according to the actual machine requirements. A
112
Stop responses, Safe Operating Stop (SBH), safe standstill (SH)
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated