Function Description - Siemens SIRIUS 3SK1 Equipment Manual

5.1.4.2

Function description

The 3SK1112 safety relay has 2 safety-related semiconductor outputs and one non-safety-
related signaling circuit.
On the front of the device there is a 4-way DIP switch for function setting and 4 LEDs for status
and function display.
The SET/RESET button is used to load function settings and to restart the device (reset).
On commissioning, the device runs through a self-test. This checks that the internal electronics
and firmware are functioning correctly. All internal safety-critical parts of the circuit are cyclically
monitored for faults during operation. The semiconductor outputs cyclically run through a light/
dark test for up to 2.5 ms (dynamically) to verify their correct functioning.
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005
3SK1 / 3RQ1 devices
5.1 3SK1 standard
61