Siemens SIRIUS 3RK3 - Page 225

Example
The left MSS 3RK3 Advanced responds to an EMERGENCY STOP and passes a signal for a safety-
related AS-i output to the right-hand MSS 3RK3 Advanced. The right-hand MSS 3RK3 Advanced
behaves like a safety-related AS-i output and can read and process the signal. Both motors are
shut down safely through a safety-related output of an expansion module.
4a
4b
3a
1
4
2
6
3
5
[%LW
① CPU/PLC
② AS-i power section
③ MSS 3RK3 Advanced (controlling a safety-related AS-i output slave on AS‑i address #01) with connected EMERGENCY
STOP
④ MSS 3RK3 Advanced (safety-related AS-i output slave monitors AS-i address #01; no AS-i address is assigned) with
motors connected to Q1/Q2
⑤ Data exchange between MSS 3RK3 Advanced ③ and MSS 3RK3 Advanced ④
⑥ AS‑i master
Figure 6-30 MSS 3RK3 Advanced as a safety-related AS-i output
In this case, the input and output terminals of the logic diagram in Safety ES of the right-hand
MSS 3RK3 Advanced have the following designations:
$6,B)4
6ORWB)4
6ORWB)4
3 4
4 4a
Figure 6-31 Evaluation of safety-related AS-i output in the logic diagram
Operation
6.5 Connecting to the AS-i master via AS-Interface
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006 225