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

03.06
6.3

Safe stops A-F

6.3.1

General information

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-relevant functions when limit values are violated, initiate an alarm. The
external Stop responses selected by SGEs do not issue an alarm and are acknowl-
edged when the SGEs are de-selected.
Stop responses SBH and SH
Fig. 6-5 shows the relationship between the stop responses and the safe operating
stop (SBH) or the safe standstill (SH).
0
Stop
A
Fig. 6-5
A high degree of security against faults/errors is afforded by the two-channel sy-
stem 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 fash-
ion according to the actual machine requirements. A differentiation is made be-
tween the stop responses STOP A, B, C, D, E, F and the test stop. The type of
stop response that occurs in the event of a fault/error can either be pre-determined
by the system or configured by the machinery construction OEM.
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
Stop –Category acc. to EN60204 Part 1
1
Only for active axis–specific safety function
Stop
Stop
C
B
Setpoint – Setpoint –
input "0" input
Only under fault conditions
SH
(pulse cancellation)
Stop responses, safe operating stop (SBH), safe standstill (SH)
Safety Functions Integrated in the System/Drive
2
Stop Stop
D E
Path– – Retraction –
related cond– –
"0"
in a group itions
SBH
(standstill in closed–loop control)
6.3 Safe stops A-F
Stop
F
6-113