SIEMENS
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Siemens IK PI · 2015
AS-Interface
ASIsafe
3SF1 mechanical safety switches
4
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Overview
The 3SF1 position switches with safety-related 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 compo-
nent is integrated in the switch enclosure.
Examples of selection options in the modular system
Modular system
The position switches of the 3SF11.4 and 3SF12.4 series are de-
signed as a modular system comprising different versions of the
basic switch and an actuator which must be ordered separately.
Thanks to the modular design of the switch the end users can
select the right solution for their application from numerous ver-
sions and install it themselves in a very short time.
Design
The 3SF1 switches are available in four different enclosure sizes:
• Plastic and metal enclosures according to EN 50047, 31 mm
wide, with M12 plug
• Metal enclosures according to EN 50041, 40 mm wide, with
M12 plug
• Plastic enclosures, 50 mm wide, with M12 plug and M12
socket
• Metal enclosures, 56 mm wide, with M12 plug and M12 socket
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 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 offers:
•
ASIsafe electronics component integrated in the enclosure,
with low power consumption < 60 mA
•
An extensive range of actuators
•
Status display with three LEDs
Operating conditions
With the standard position switches, mechanical positions of
moving machine parts are converted into electrical signals.
Through their modular and uniform design and large number of
variants, the devices can comply with practically all require-
ments in industry.
Devices are available with enclosure versions to suit the
particular ambient conditions. Different control tasks can be
performed with the best contact blocks suited for the particular
purpose. And many different actuator variants are available to
match the mechanical configuration of the moving machine
parts. Dimensions, fixing points and characteristics are largely in
accordance with the 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-Volt-
age Switchgear and Controlgear, General) and IEC 60947-5-1
(Electromechanical Control Circuit Devices).
The mechanical design of the switches corresponds to the
requirements of the fail-safe 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 2
according to ISO 13849-1 or SIL 1 according to IEC 61508.
Categories 3 or 4 according to ISO 13849-1 or SIL 2 or 3 accord-
ing to IEC 61508 can be achieved by using a second 3SE5 po-
sition switch.
The 3SF1 position switches are approved according to UL 508,
UL 50 and UL 746-C.
Manuals
More information see configuration manual
"SIRIUS 3SE5 / 3SF1 Position Switches"
© Siemens AG 2014