Siemens ISI EN 50295 Brochure page 19

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Overview
The light curtains and light arrays of Category 4 acc. to EN 954-
1 offer active optical protection for persons at machines. They
can be connected to AS-Interface directly and safely as an op-
tion.
SIGUARD light curtains and light arrays are
• active opto-electronic protective devices (AOPD),
• comply with Type 4 acc. to EN 61496-1, -2,
• are EU prototype-tested,
• protect the operating personel working on or near dangerous
machines,
• operate contact-free,
• are free of wear in comparison to mechanical systems (e.g.
safety mats).
For further details, see the manual "Safety Integrated" and the
operating instructions for the respective devices.
AS-Interface Safety at work
AS-Interface light curtains and light arrays
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Benefits
• Double-scan function
• Cascading of host and guest devices
• Two transmission channels
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Design
A SIGUARD Light Curtain or light array comprises a transmitter
and a receiver that must be mounted opposite each other.
Depending on the resolution and length, a specific number of
transmit and receive diodes are arranged in a vertical row.
The infra-red LEDs of the transmitter send short light pulses that
are received by the receive diodes.
SIGUARD Light Curtains:
• Resolution 14, 30 and 50 mm,
• Length 150 mm to 3 m,
• Cascading of master and slave devices to create larger height
or length of protective zone or for angular arrangement.
SIGUARD Light Arrays:
• 2-, 3- or 4-beam for access protection.
Standards
• EN 61 496-1, -2, IEC 61 496-1, -2 (requirements for non-contact
protection systems)
• EN 999 (incl. calculation of safety clearances)
• EN 954-1 (safety of machines, safety-related parts of controls).
AS-Interface
for Category 4
Siemens IK PI · 2004 6/19
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