KEYENCE SL-CHG Series - Manual (Page 50)

Chapter 6 Appendix
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English ENGLISH
6 Appendix
6-1 Glossary
(1) ESPE (Electro-Sensitive Protective Equipment)
This is an assembly of devices and/or components working together for protective tripping or pres-
ence-sensing purposes and comprising as a minimum a sensing device, controlling/monitoring
devices and OSSD.
(2) AOPD (Active Opt-electronic Protective Device)
This is a device whose sensing function is performed by opto-electronic emitting and receiving
elements detecting the interruption of optical radiations generated, within the device, by an opaque
object present in the specified detection zone.
(3) MPCE (Machine Primary Control Element)
The electrically powered element that directly controls the normal operation of a machine in such a way
that it is the last element ( in time ) to function when the machine operation is to be initiated or
ceased.
(4) OSSD(Output Signal Switching Device)
The component of the ESPE connected to the control system of the machine that responds by going
OFF when the sensing device is activated during normal operation.
(5) FSD (Final Switching Device)
The component of the machine’s safety-related control system that interrupts the circuit to the MPCE
when the OSSD goes OFF.
(6) Lockout Condition
A condition, initiated by a fault, preventing normal operation of the ESPE which is automatically
triggered when all OSSDs and, where applicable, all FSDs are signaled to go OFF.
(7) Start Interlock
A mechanism of preventing automatic starting of the machine when the electrical supply to the ESPE
is switched on, or is interrupted and restored.
(8) Restart Interlock
A mechanism of preventing automatic restarting of the machine after activation of the sensing device
during a hazardous part of the operating cycle of the machine, after a change in the mode of opera-
tion of the machine, and after a change in the method of starting control of the machine.
(9) EAA (Effective Aperture Angle)
The maximum angle of deviation from the optical alignment of the emitting elements and the receiv-
ing elements within which the AOPD continues in normal operation.
(10) Response Time
The maximum time between the occurrence of the event leading to the activation of the sensing
device of the safety light curtain for press/shearing machines and the OSSDs turning OFF.
(11) Detection Capability
The sensing function parameter limit specified by the supplier that will cause activation of the ESPE
of the safety light curtain for press/shearing machines.
The safety light curtain for press/shearing machines can detect the object having the diameter of this
limit or more.
(12) Detection Zone
The zone within which a specified test piece will be detected by the ESPE.
(13) Blanking
The configuration of the detection capability such that the presence of an object within a defined part
of the zone will not cause the OSSD(s) to turnn OFF.
(14) Fixed Blanking
The location of the blanked areas of the detection zone remains fixed during operation.
(15) Floating Blanking
The blanked area of the detection zone follows the location of a moving object during operation.
The above explanations are based on the definitions given in IEC standards for machine safety, but are
expressed in simpler terms in the context of the SL-CHG.
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