5.4 3RQ1 output expansion
5.4.1 Applications
Expansion of safety-related outputs
The 3RQ1 output expansions are used to expand the safety-related outputs. The maximum
achievable Performance Level PL/Cat. in accordance with ISO 13849-1, SILCL in accordance with
IEC 62061, SIL in accordance with IEC 61508 is SIL 2 / PL; for 3RQ12. is SIL 3 / PL e. To achieve this,
you must realize the external wiring, i.e. the connection between the basic unit and 3RQ1
output expansion, in a fail-safe manner, e.g. with the 3ZY12 device connector.
With the 3RQ10., SIL 2 in accordance with IEC 62061 can only be achieved by means of
additional feedback circuit wiring of the 3RQ1 normally closed contact in the safety circuit of the
3SK1 basic unit.
The 3RQ12. output expansions are certied up to SIL 3 / PL e in accordance with IEC 62061 / ISO
13849. With these variants, the feedback circuit is situated on the device connector, that is to
say, additional wiring of the feedback circuit is not necessary.
Note
If expansion units are controlled via the 3ZY12 device connector, additional feeding of the
control supply voltage (A1/A2) at one of the output expansions leads to a fault in the system
conguration.
Note
Using the output expansions with conventional wiring
If you require Stop category 1 outputs for the output expansion, terminals A1/A2 of the output
expansion must be connected to outputs 38 or 48 on 3SK1 basic units with relay outputs or to
Q1t/Q2t (in the case of 3SK1 with semiconductor outputs).
WARNING
Ensuring electrical safety and safety function
The normally closed contact of 3RQ12. is designed for a voltage of 24 V DC. If higher voltages
occur, electrical safety cannot be ensured due to the voltage clearance distances. If the 3RQ12.
is integrated in a system with a device connector, the feedback circuit is routed via the device
connector; connection of external voltage is not necessary and not permitted. Connecting
external voltage can bypass the safety function.
Control
You can control the output expansions via the supply voltage (A1/A2).
Alternatively, with the 24 V AC/DC variant, you can control the output expansion via the 3ZY12
device connector.
3SK1 / 3RQ1 devices
5.4 3RQ1 output expansion
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
98 Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005
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