Specifications

AS-Interface
ASIsafe
3SF1 position switches with separate actuator
6/21
Siemens IK PI · 2012
6
■ 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 × 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 insert 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
plug
(plastic version) connected to the yellow AS-Interface bus cable.
The wide enclosures (50 or 56 mm) also have an M12 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
Operating conditions
Position switches with separate actuator are used where the
position 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
accordance 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 Switchgear and Controlgear, General) and
IEC 60947-5-1 (Electromechanical Control Circuit 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.
Category 3 acc. to ISO 13849-1 (EN 954-1) or SIL 2 acc. to
IEC 61508 can be attained using a 3SF1 position switch.
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.
Kap_06_en.book Seite 21 Freitag, 2. September 2011 1:42 13
© Siemens AG 2011