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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.
PROTECTED AREA:
area where a specified test object is detected by the ESPE.
SAFETY LIGHT CURTAIN:
it is an active optoelectronic protective device (AOPD) including
an integrated system consisting of one or several emitting elements and one or several
receiving elements forming a detection area with a detecting capacity specified by the
supplier.
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.
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 OSSD2 light curtain outputs are simultaneously
switched OFF within the device response time.
OUTPUT SIGNAL SWITCHING DEVICE (OSSD):
part of the ESPE connected to machine
control system. When the sensor is enabled during standard operating conditions, it switches
to disabled status.
FINAL SWITCHING DEVICE (FSD):
part of the control system involving machine safety
conditions. It breaks the circuit to the machine primary control element (MPCE) when the
output signal switching device (OSSD) becomes inactive.
PROTECTIVE DEVICE:
device having the function to protect the operator against possible
risks of injury due to the contact with machine potentially-dangerous parts.
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.
MIN. INSTALLATION DISTANCE:
min. distance necessary to allow machine dangerous
moving parts to completely stop before the operator can reach the nearest dangerous point.
This distance shall be measured from the middle point of the detecting area to the nearest
dangerous point. Factors affecting min. installation distance value are machine stop time,
total safety system response time and light curtain resolution.
MACHINE PRIMARY CONTROL ELEMENT (MPCE):
electrically-powered element having
the direct control of machine regular operation so as to be the last element, in order of time,
to operate when the machine has to be enabled or blocked.
Summary of Contents for SG4-14-030-OO-P
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