Siemens SIRIUS 3RK3 - A Typical Configuration of the Subsystem with AS-Interface

3.4 A typical con󹪝guration of the subsystem with AS-Interface
The following central units can be integrated on the AS-i bus:
• MSS 3RK3 Advanced
• MSS 3RK3 ASIsafe basic
• MSS 3RK3 ASIsafe extended
In doing so the 3RK3 central unit can perform various functions:
• Monitoring of AS‑i slaves
• Simulation of AS‑i slaves
• Safety-related data exchange with other safety monitors (e.g. with further MSS 3RK3 units
with AS-i interface)
Note
MSS 3RK3 bus load
The MSS 3RK3 is always a bus load from an A/B slave on the AS‑i bus. This bus load does not
depend on how many slaves are simulated by the 3RK3 central unit or whether only AS-i slaves
are monitored.
Some typical applications of the MSS 3RK3 with AS-i interface are described below. These
examples are all represented with a 3RK3 Advanced central unit. However, they apply equally to
all other central units with AS-i interface. However, you must note the limitations on the number
of expansion modules.
Integration of the MSS 3RK3 Advanced as an AS‑i monitor on an AS‑i bus
The MSS 3RK3 Advanced monitors the various safety-related and non-safety-related AS-i slaves
as a safety monitor and exchanges up to 12 safety-related signals bidirectionally with an
AS‑i safety monitor.
Moreover, the MSS 3RK3 Advanced can mutually independently control up to 12 safety-related
AS-i outputs (with up to 4 outputs).
Overview
3.4 A typical con󹪝guration of the subsystem with AS-Interface
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006 39