5.5 3SK1 input expansions
5.5.1 Input expansion 3SK1220
5.5.1.1 Device features
Article number
3SK1220-xAB40 24 V DC
x = 1: Screw-type terminal; x = 2: Spring-loaded (push-in) terminal
Device properties:
• 4-way DIP switch for function setting (parameterization)
• NO contact/NC contact evaluation via external jumper
• SET/RESET button
• 4 LEDs for status and function display
• 1 input (ON button circuit)
• 2 test outputs
• Enclosure width 17.5 mm
• Removable terminals
• Mounting exclusively on 3ZY12 device connectors
5.5.1.2 Applications
The number of sensor inputs for a basic unit can be expanded using input expansions. Input
expansions must always be mounted to the left of a basic unit.
The input expansion 3SK1220 is certied to SIL 3/PL e.
The SILCL/PL achieved by the overall system depends on the external connection of sensors and
actuators.
The input expansion 3SK1220 is supplied via the 3ZY12 device connectors.
3SK1 / 3RQ1 devices
5.5 3SK1 input expansions
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
104 Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005
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