Specifications
AS-Interface
ASIsafe
3SF1 position switches with solenoid interlocking
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Siemens IK PI · 2012
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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 switch with solenoid interlocking and
with integrated ASIsafe electronics
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 actuator is not included in the scope of supply for the posi-
tion switch and must be ordered separately, with a choice of
eight variations depending on 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 enclosure from contamination is
available for operation in dusty environments.
Solenoid interlocking
There are two versions for locking the actuator:
• Spring-actuated lock (closed-circuit principle) with various re-
lease mechanisms
• Magnetic field lock (open-circuit principle)
Display
The switches have a status display with four LEDs:
• LED 1 (green): AS-i
• LED 2 (red): FAULT
• LED 3 (yellow): F-IN1
• LED 4 (yellow): F-IN2
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
(no additional supply of auxiliary power is required thanks to the
low current consumption of the solenoid of max. 170 mA).
Benefits
The new generation of 3SF1 3 position switches with solenoid
interlocking offers:
• More safety through higher locking forces:
- 1300 N for the plastic version
- 2600 N for the metal version
• Various release mechanisms:
lock release, escape release and emergency release
• ASIsafe electronics integrated in the enclosure;
connected through 4-pole M12 plug
• Current consumption of the solenoid max. 170 mA
• Two contact blocks as standard equipment,
hence fewer versions needed
• Same dimensions for all enclosure versions:
Plastic, metal
• An extensive range of actuators
• Status display with four LEDs
Operating conditions
The position switches with solenoid interlocking are exceptional
safety-related devices which prevent an unforeseen or inten-
tional opening of protective doors, protective grills or other cov-
ers as long as a dangerous situation is present (i.e. follow-on
motion of the switched off machine).
The safety position switches with solenoid interlocking have the
following functions:
• Enabling the machine or process with closed and locked
protective device
• Locking the machine or process with opened protective
device
• Position monitoring of the protective device and solenoid inter-
locking
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.
The switches are approved for use with locking devices accord-
ing to EN 1088 and EN 292, Parts 1 and 2.
The 3SF5 3 position switches with interlocking have a VDE test
marking.
With a 3SF1 3 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.
Kap_06_en.book Seite 25 Freitag, 2. September 2011 1:42 13
© Siemens AG 2011