SIEMENS
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Siemens IC 10 · 2017
SIRIUS 3SF1 Mechanical Safety Switches for AS-Interface
General data
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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 wired up convention-
ally.
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 se-
lect 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 ISO 13849-1 is thus achieved.
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Benefits
The new generation of 3SF1 position switches offers:
•
ASIsafe electronics integrated in the enclosure
with low power requirements < 60 mA
•
An extensive range of actuators
•
Status display with three LEDs
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Application
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 partic-
ular ambient conditions. Different control tasks can be per-
formed 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 machined
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-Voltage Controlgear, General) and IEC 60947-5-1
(Electromechanical Control Devices).
The mechanical design of the switch corresponds to the require-
ments of the fail-safe principle according to EN ISO 14119.
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 EN ISO 13849-1 or SIL 1 according to IEC 61508.
Categories 3 or 4 according to EN ISO 13849-1 or SIL 2 or 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.
© Siemens AG 2016