IDEC SG4 Type 4 Finger & Hand - Manual (Page 63)

Instruction Manual SG4-B Series
59
15. GLOSSARY
ACTIVE OPTOELECTRONIC PROTECTIVE DEVICE (AOPD): its
detection function is achieved thanks to the use of optoelectronic
receivers and emitters detecting the optical beams interruptions inside
the device caused by an opaque object present inside the specified
detecting area.
An active optoelectronic protective device (AOPD) can operate both in
emitter-receiver mode and in retro-reflective light curtains.
BLOCK CONDITION (=BREAK): status of the light curtain taking
place when a suitably-sized opaque object (see DETECTING
CAPACITY) interrupts one or several light curtain beams.
Under these conditions, OSSD1 and OSS2 light curtain outputs are
simultaneously switched OFF within the device response time.
CONTROLLED MACHINE: machine having the potentially-dangerous
points protected by the light curtain or by another safety system.
CROSSING HAZARD: situation under which an operator crossing the
area controlled by the safety device and this latter stops and keeps the
machine stopped until the hazard is eliminated, and then enters the
dangerous area. Now the safety device could not be able to prevent or
avoid an unexpected restart of the machine with the operator still
present inside the dangerous area.
DANGEROUS AREA: area representing an immediate or imminent
physical hazard for the operator working inside it or who could get in
contact with it.
DETECTING CAPACITY (= RESOLUTION): sensor function
parameter limit as specified by the manufacturer, which activates the
electrosensitive protection equipment (ESPE). In case of an active
optoelectronic protective device (AOPD), with resolution we mean the
minimum dimension, which an opaque object must have in order to
interrupt at least one of the beams that constitute the sensitive area.
EDM: see “External device monitoring) in the glossary.
ELECTROSENSITIVE PROTECTIVE EQUIPMENT (ESPE): assembly
of devices and/or components working together to activate the
protective disabling function or to detect the presence of something
and including at least: a sensor, command/control devices and output
signal switching devices.