Siemens SIRIUS 3RK3 - Monitoring of Safety-Related AS-I Input Slaves

6.5.7.10 Monitoring of safety-related AS-i input slaves
The MSS 3RK3 with AS‑i interface can monitor up to 31 safety-related AS-i input slaves. These can
be simulated by real input slaves or by other devices such as additional MSS 3RK3 units with AS-
i interface, safety monitors, etc.
Terminal designation in Safety ES
Signals from the safety-related AS-i input slave to the AS-i master (IN) can be incorporated into
the interconnection logic as in input and con󹪝gured in Safety ES.
If the AS‑i input slave also has non-safety-related outputs, these master calls to the AS-i slave (Q)
can also be monitored and incorporated in the logic.
The terminal designations of the input cells and the monitoring function "AS‑i 2F‑DI" for this are
named:
Terminal designation in the input cell Explanation
ASi#xx_F-IN1&2 Sensor value: Safety-related signal from the code sequence of
a two-channel sensor
ASi#xx_F-INc Input terminal signal of the ASIsafe input slave for the moni‐
toring functions.
If monitoring function "AS-i 2F-DI" is used:
The monitoring function "AS-i 2F-DI" is used instead of an
input cell if you want to diagnose both of the input terminal
signals of the ASIsafe input slave.
xx: AS-i address
c: Number of the safety-related input
Note
Non-safety-related data with combined AS‑i slaves
The signals of combined AS‑i slaves with safety-related AS‑i inputs and standard AS‑i outputs are
composed partly of safety-related signals and partly of non-safety-related signals. To be able to
interconnect the non-safety-related information of these slaves, the "Monitor non safe I/O"
check box must be selected as for the non-safety-related slave in the subsystem (navigation
window) in the properties of the slave.
Note
Single-channel use of safety-related AS-i input slaves
The safety-related AS‑i input slaves have two inputs that cannot be used independently of each
other, so that a safety-related AS‑i input slave can only be used in two channels. If a safety-
related AS‑i input slave is nevertheless to be used in one channel only, the second input must be
bridged or assigned two single-channel sensors so that the entire code sequence can be viewed.
Operation
6.5 Connecting to the AS-i master via AS-Interface
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006 229