Specifications

AS-Interface
ASIsafe
3SF1 Position Switches with Tumbler
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Siemens IK PI · 2009
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 tumbler 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 x 90°. The
switches can also be approached from above.
The actuators are not included in the scope of supply of the
position 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
padlocks is available for even more safety.
A rubber cap to protect the enclosure from contamination is
available for operation in dusty environments.
Tumbler
There are two versions for locking the actuator:
• Spring-actuated lock (closed-circuit principle) with various
release mechanisms
• Magnet field lock (open-circuit principle)
Display
The switches have a status display with four LEDs:
• LED 1 (yellow): F-IN1
• LED 2 (yellow): F-IN2
• LED 3 (green): AS-i
• LED 4 (red): 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 (no additional supply of auxiliary power is
required thanks to the low current consumption of the magnet of
max. 170 mA).
■ Benefits
The new generation of 3SF1 3 position switches with tumbler
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 magnet max. 170 mA
• Two contact blocks as standard equipment,
hence fewer versions needed
• Same dimensions for all enclosure variants;
plastic, metal
• An extensive range of actuators
• Status display with four LEDs
■ Application
The position switches with tumbler are exceptional, technically
safe devices which restrict and prevent an unforeseen or inten-
tional opening of protective doors, protective grills or other
covers as long as a dangerous situation is present (i.e. follow-on
motion of the shutdown machine).
The safety position switches with tumbler 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 tumbler
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.
The switches are approved for use with locking devices accord-
ing to EN 1088 and EN 292, Parts 1 and 2.
3SE5 3 position switches with tumbler bear the VDE test mark for
tested according to GS-ET19 (Test Principles of the German
Trade Association for Locking Devices with Electromagnetic
Tumblers).
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 ac-
cording 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.