3Sk1 Input Expansions; Input Expansion 3Sk1220; Device Features; Applications - Siemens SIRIUS 3SK1 Manual

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5.4

3SK1 input expansions

5.4.1

Input expansion 3SK1220

5.4.1.1

Device features

Article number (MLFB):
3SK1220-xAB40
(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.
SIRIUS 3SK1 safety relays
Manual, 06/2018, A5E02526190021A/RS-AD/004
5.4 3SK1 input expansions
24 V DC
3SK1 devices
93

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