User Manual

Application examples
13.1 Examples of EMERGENCY STOP shutdown applications
SIRIUS ACT 3SU1 pushbuttons and signaling devices
System Manual, 02/2015, A5E03457306020A/RS-AB/002
267
Configuration
Figure 13-2 Emergency stop shutdown via AS-i to SIL 3 or PL e with a Modular Safety System
Operating principle
The Modular Safety System monitors each of the
two
-channel emergency stop devices connected to
AS
-i. When one of the emergency stop devices is
actuated, the Modular Safety System opens the
enabling circuits and switches the power conta
c
tors
off in a safety
-related way. If the emergency stop
device is unlatched and the feedback circuit is
closed, the Start button can be used to switch on
again.