SG4 BASE
7/74
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:
NORM
DESCRIPTION
EN 61496-1: 2013
Safety of machinery: electrosensitive protective equipment.
Part 1: General prescriptions and tests.
EN 61496-2: 2013
Safety of machinery: electrosensitive protective equipment - Particular requirements
for equipment using active optoelectronic protective devices.
EN ISO 13849-1: 2015
Safety of machinery. Safety-related parts of control systems.
Part 1: General principles for design
EN 61508-1: 2010
Functional safety of electrical/electronic/programmable electronic safety-related
systems.
Part 1: General requirements
EN 61508-2: 2010
Functional safety of electrical/electronic/programmable electronic safety-related
systems.
Part 2: Requirements for electrical/electronic/programmable electronic safety-
related systems
EN 61508-3: 2010
Functional safety of electrical/electronic/programmable electronic safety-related
systems.
Part 3: Software requirements
EN 61508-4: 2010
Functional safety of electrical/electronic/programmable electronic safety-related
systems.
Part 4: Definitions and abbreviations
EN 62061:2005/A2: 2015
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
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.
