12. Appendix
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12. Appendix
12.1 Glossary
Glossary
Description
Electro-sensitive
protective
equipment (ESPE)
Assembly of devices and/or components working together for protective tripping or presence sensing
purposes and comprising as a minimum:
1) a sensing device;
2) controlling/monitoring devices;
3) output signal switching devices.
Sensing device
Part of the ESPE which uses electro-sensitive means to determine the event or state that the ESPE is
intended to detect
Controlling/
Monitoring device
Part of the ESPE that:
– Receives and processes information from the sensing device and provides signals to the OSSD,
– Monitors the sensing device and the OSSD
Output signal
switching device
(OSSD)
When the sensing device is actuated during normal operation, the output circuit goes to OFF state.
Active onto-
electronic
protective device
(AOPD)
A device whose sensing function is performed by onto-electronic emitting and receiving elements
detecting the interruption of optical radiations generated, within the device, by an opaque materials
present in the specified detection zone
Light curtain
An integrated assembly of multiple emitting elements and receiving elements forming a detection
zone with a detection capability specified by the AOPD supplier
Detection
capability
Dimension representing the diameter of the opaque test piece which will actuate the sensing device
when placed in the detection zone
Beam center-line Optical path joining the optical center of an emitting element and the optical center of the
corresponding receiving element during normal operation
Effective Aperture
Angle (EAA)
Maximum angle of deviation from the optical alignment of the emitting element(s) and the receiving
element(s) within which the AOPD continues in normal operation
Geometrically
Restricted Optical
Design (GROD)
Geometrically restricted optical design
1) the effective aperture angle (EAA) of each emitting and each receiving element does not exceed the
values given in the specification;
2) the axes of the beams are parallel;
3) side lobes are minimized;
4) the spacing between beam center-lines is uniform;
5) the value of detection capability is based on the complete obscuration of at least one beam for any
and all positions of the test piece within the detection zone.
External device
monitoring (EDM) ESPE or AOPD monitors the state of external control devices
Muting
Temporary automatic suspension of a safety-related function(s), the OSSD outputs remain ON state
regardless of the beams are blocked.
Blanking
Optional function that permits an object of a size greater than the detection capability of the ESPE or
AOPD to be located within the detection zone without causing an OFF state of OSSD(s)
Stopping
performance
monitor (SPM)
Monitoring means to determine whether or nor the overall system stopping performance is within the
preset limit(s)
Lockout condition Condition, initiated by a fault, preventing normal operation of the ESPE or AOPD. All OSSD(s) are
signaled to go to the OFF state.
Start interlock
Preventing an automatic machine start when the electrical supply to the ESPE or AOPD, or the supply is
interrupted and restored.
Restart interlock
Preventing automatic restarting of a machine;
• Actuation of the sensing device during a hazardous part of the machine operating cycle
• A change in mode of operation of the machine or a change in the means of control of the machine
Synchronous line
RS485 allows synchronous communication between the emitter and receiver.
