Specifications

AS-Interface
ASIsafe
3SF1 Position Switches with Separate Actuator
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Siemens IK PI · 2009
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■ Overview
The 3SF1 position switches with safety-oriented communication
can be directly connected using the AS-Interface bus system.
The safety functions no longer have to be conventionally wired
up.
With the 3SF1 position switches the ASIsafe electronics are inte-
grated in the switch enclosure.
3SF1 position switches with separate actuator and
with integrated ASIsafe electronics
3SF1 position switches with separate actuator have the same
enclosures as the standard switches.
Operation
The actuator head is included in the scope of supply. For actua-
tion from four directions it can be adjusted through 4 x 90°. The
switches can also be approached from above.
The actuators are not included in the scope of supply of the po-
sition switch and must be ordered separately from a choice of six
versions to suit the application.
The actuator is encoded. Simple overruling by hand or auxiliary
devices is impossible.
A high-grade steel blocking device for attaching up to eight pad-
locks is available for even more safety.
A rubber cap to protect the metal enclosure from contamination
is available for operation in dusty environments.
Display
The switches have a status display with three LEDs:
• LED 1 (yellow): F-IN1
• LED 2 (yellow): F-IN2
• LED 3 (green/red):AS-i/FAULT
Connection
Connection to the AS-Interface is by means of a 4-pole M12
connector socket (plastic version) connected to the yellow AS-
Interface bus cable.
The wide enclosures (50 or 56 mm) also have an M12 connector
socket for connecting a second position switch. Category 4
according to EN 954-1 is thus achieved.
■ Benefits
The new generation of 3SF1 position switches with separate
actuator offers:
• ASIsafe Electronics integrated in the enclosure,
with low power consumption < 60 mA
• An extensive range of actuators
• Status display with three LEDs
■ Application
Position switches with separate actuator are used where the po-
sition of doors, covers or protective grills must be monitored for
safety reasons.
The position switch can only be operated with the matching
coded actuator. Simple overruling by hand or auxiliary devices
is impossible.
Devices are available with enclosure versions to suit the partic-
ular ambient conditions. Different control tasks can be per-
formed with the best contact blocks suited for the particular
purpose. Dimensions, fixing points of the enclosure are in accor-
dance with EN 50041 or EN 50047 standards.
The devices are suitable for use in any climate.
Standards
The switches comply with the standards IEC 60947-1 (Low-
Voltage Controlgear, General) and IEC 60947-5-1 (Electrome-
chanical Control Devices).
The mechanical design of the switch corresponds to the require-
ments of the failsafe principle according to EN 1088.
Approvals
AS-Interface according to EN 50295 and IEC 62026-2.
With a 3SF1 position switch it is possible to achieve category 3
according to ISO 13849-1 (EN 954-1) or SIL 2 according to
IEC 61508.
Category 4 according to ISO 13849-1 (EN 954-1) or SIL 3
according to IEC 61508 can be achieved by using a second
3SE5 position switch.
The 3SF1 position switches are approved according to UL 508,
UL 50 and UL 746-C.