3SK1 devices
5.4 3SK1 input expansions
3SK1 safety relays
Manual, 04/2013, A5E02526190021A/RS-AA/01
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5.4 3SK1 input expansions
5.4.1 Input expansion 3SK1220
5.4.1.1 Device features
MLFB:
3SK1220-xAB40 24 V DC
(x) 1 = screw-type terminal; 2 = 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
5.4.1.2 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 certified 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.
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