1 GENERAL INFORMATION
1.1 GENERAL DESCRIPTION
The safety light curtains are optoelectronic multibeam devices that are used to protect working areas that, in
presence of machines, robots, and automatic systems in general, can become dangerous for operators that can
get in touch, even accidentally, with moving parts.
The light curtains are intrinsic safety systems used as accident-prevention protection devices and are
manufactured in accordance with the international Standards in force for safety, in particular:
Safety of machinery: electrosensitive protective equipment.
Part 1: General prescriptions and tests.
Safety of machinery: electrosensitive protective equipment - Particular requirements
for equipment using active optoelectronic protective devices.
Safety of machinery. Safety-related parts of control systems.
Part 1: General principles for design
Functional safety of electrical/electronic/programmable electronic safety-related
systems.
Part 1: General requirements
Functional safety of electrical/electronic/programmable electronic safety-related
systems.
Part 2: Requirements for electrical/electronic/programmable electronic safety-
related systems
Functional safety of electrical/electronic/programmable electronic safety-related
systems.
Part 3: Software requirements
Functional safety of electrical/electronic/programmable electronic safety-related
systems.
Part 4: Definitions and abbreviations
Safety of machinery. Functional safety of electrical/ electronic/programmable
electronic safety-related control systems.
The device, consisting of one emitter and one receiver contained inside aluminium profiles, generates infrared
beams that detect any opaque object positioned within the light curtain detection field.
The emitter and the receiver are equipped with the command and control functions.
The connections are made through one or more connectors as specified in cfr.ELECTRICAL CONNECTIONS
page 27.
The synchronisation between the emitter and the receiver takes place optically, i.e. no electrical connection
between the two units is required.
The microprocessor guarantees the check and the management of the beams that are sent and received through
the units: the microprocessor – through some LEDs – informs the operator about the general conditions of the
safety light curtain (cfr.USER INTERFACE AND DIAGNOSTICS page 42).
The receiver is the main controller for all functions. It monitors all safety actions in case of failure and performs
general functions as well.
During installation, an user interface facilitates the alignment of both units (cfr.ALIGNMENT PROCEDURE page
33).
As soon as an object, or a limb or the operator’s body accidentally interrupts one or some of the infrared beams
sent by the emitter, the receiver immediately opens the OSSD outputs or trigger Safety State over connected
safety Fieldbus.
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