Siemens SIRIUS 3RK3 - Functions of the MSS 3 RK3 on the AS-I Bus

6.5.7 Functions of the MSS 3RK3 on the AS-i bus
6.5.7.1 Functions of the MSS 3RK3 on the AS-i bus
The MSS 3RK3 with AS-i interface can perform various functions on the AS‑i bus:
• Simulation of slaves
– Simulation of non-safety-related AS‑i slaves
The MSS 3RK3 with AS‑i interface can simulate up to 4 non-safety-related AS-i slaves.
– Simulation of safety-related AS-i slaves
The MSS 3RK3 with AS‑i interface can simulate safety-related AS-i slaves and perform one
of the following functions on the AS-i bus in each case:
◆ Simulation of safety-related AS-i input slaves
◆ Setting/resetting of safety-related AS-i outputs
The MSS 3RK3 ASIsafe basic can simulate up to 8 safety-related AS‑i slaves.
The MSS 3RK3 ASIsafe extended can simulate up to 10 safety-related AS‑i slaves.
The MSS 3RK3 Advanced can simulate up to 12 safety-related AS‑i slaves.
• Representation of safety-related AS-i outputs
The MSS 3RK3 with AS-i interface can represent up to 31 safety-related AS‑i outputs on the
AS‑i bus, where each of these AS‑i outputs can have up to 4 safety-related output functions.
• Monitoring slaves
The MSS 3RK3 with AS-i interface is con󹪝gured as an AS‑i safety monitor and can monitor and
evaluate all frames on the AS‑i bus.
– Monitoring of non-safety-related AS-i slaves
MSS 3RK3 evaluates up to 14 non-safety-related AS-i slaves.
– Monitoring of safety-related AS-i input slaves
MSS 3RK3 evaluates up to 31 safety-related AS‑i input slaves.
Note
Maximum expanded con󹪝guration of the AS-Interface
Up to 31 standard addresses can be assigned on an AS-i bus. Once all standard addresses are
assigned, maximum 4 safety monitors without an address can be additionally installed.
If fewer than 31 standard addresses are assigned, an additional safety monitor or another AS-i
component without an address (e.g., ground fault monitoring modules) can be installed for
every unassigned standard address.
You will 󹪝nd further information in the "AS-Interface System Manual (11/2008 edition) with
Supplements (09/2010 edition) (http://support.automation.siemens.com/WW/view/de/
26250840/0/en)."
Note
MSS 3RK3 bus load
The MSS 3RK3 is always a physical bus load from an A/B slave on the AS‑i bus. This bus load does
not depend on how many slaves can be simulated by the MSS 3RK3 or whether only AS-i slaves
are monitored.
Operation
6.5 Connecting to the AS-i master via AS-Interface
SIRIUS 3RK3 Modular Safety System
214 Equipment Manual, 07/2020, NEB926253002000/RS-AC/006