Siemens SIRIUS 3SK1

System con󹪝guration
6
6.1 General information
6.1.1 General notes on the Standard system
• Safety-related outputs are expanded using external wiring.
• Output expansions must be controlled via a safety-related output of the basic unit.
• The NC circuit of the 3SK1 / 3 RQ1 output extension must be looped into the feedback circuit
(T4-INF/S) of the basic unit.
6.1.2 General information on the Advanced system
• Expansion of the safety-related outputs of 3SK1 Advanced basic units by means of external
wiring is always possible.
• Expandable using 3ZY12 device connectors on both the input and output sides.
• The output expansions are controlled via the connection interface. With the 3SK1 / 3RQ12
output expansions, the feedback circuit is also evaluated via the connection interface.
External wiring of the output expansion is therefore only necessary for 3RQ10 if SIL 2 / PL c
is to be achieved. With 3RQ10, SIL 1 / PL c can also be achieved without feedback circuit
wiring.
• When using the Advanced device series with output expansion on the device connector
described, all enabling and signaling circuits of the basic unit and output expansion can be
used as required.
• The input expansions, as well as the output expansions mounted on the 3ZY12 device
connector, are supplied with voltage via the 3ZY12 device connector. The supply voltage is
only connected once on the basic unit (24 V DC) or the 3SK1230 power supply (110 ... 240 V
AC/DC).
• Motor feeders up to 3 kW (400 V) can be implemented quickly and easily using 3RM1 Failsafe
motor starters. The motor starters can be easily connected as output expansions in the 3SK1
system.
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005 111