Siemens SIRIUS 3RK3 - Page 180

Formula Description
t
FRL
Fault reaction time of the logic of the MSS 3RK3; for AS-i output signal identical to t
RL
t
A
Reaction time of the AS-i output (ASI A), see the documentation of AS-i output
Example 2
1 43 6
2
5
① AS-i master
② AS-i power section
③ Safety-related AS‑i input slave
④ Fail-safe EMERGENCY STOP
⑤ MSS 3RK3 Advanced
⑥ Contactors
Figure 6-9 Con󹪝guration MSS 3RK3 Advanced - example 2
This case considers the signal 󹪞ow from an EMERGENCY STOP on a safety-related AS-i input slave
to an actuator (contactor) via the output terminal of an expansion module.
The EMERGENCY STOP transmits an OFF signal to the input slave. The slave transfers the signal
via the AS-i bus in a safety-related manner. MSS 3RK3 monitors this safety-related AS-i input
slave and processes the information in the logic. After taking input delay times and timer
functions in the logic into account, the MSS 3RK3 Advanced opens the contactors of the system
down via a safety-related output.
Operation
6.1 Response times
SIRIUS 3RK3 Modular Safety System
180 Equipment Manual, 07/2020, NEB926253002000/RS-AC/006