Datasensing SH4 BASE-STANDARD, Product Reference Manual, Page: 100 / 103

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SH4 BASE-STANDARD
APPENDIX G
GLOSSARY
AOPD (Active optoelectronic protective device)
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 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.
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 danger -
ous 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.
Detection capability (or Resolution)
The minimum dimension which an opaque object must have in order to interrupt at
least one beams of the ESPE whatever is position across the protected height.
Detection zone
Zone within which a specified test piece will be detected by the ESPE
EDM (External device monitoring)
Device used by the ESPE to monitor the status of the external command devices.
Emitter (TX)
Unit emitting infrared beams, consisting of a set of optically-synchronized LEDs. The
emitting unit, combined with the receiving unit (installed in the opposite position), gen -
erates an optical “curtain”, i.e. the detecting area.