Glossary of Terms
SF4C Safety light curtain
Machinery Directive
"Machinery" means an assembly of linked parts or components, at least one of which moves,
energized by electricity, compressed air, oil pressure, etc. The latest amendment to the
directive introduces safety components, placed on the market separately, into its scope.
These are defined as components which are placed on the market "to fulfill a safety function
when in use and the failure or malfunctioning of which endangers the safety or health of
exposed persons".
PSDI
Presence Sensing Device Initiation. The safety configuration that restarts automatically
without any operation by the operator after the device detects the danger status and halts for a
while.
Safety Distance
The minimum distance that must be maintained between the light curtain and the dangerous
parts of a machine so that the machine can be stopped before a human body or an object can
reach the dangerous parts.
Sensing Area
The range in which the SF4C is able to detect objects. The actual size of this range depends
on the SF4C model.
Sensing Height
The sensing height is determined by the number of beam ch10mm (+5mm at the
bottom and +5mm at the top).
Sensing Range
The range between the emitter and receiver.
Test input Function
This function enables to check the device operation by forcibly turning ON /OFF the control
output (OSSD 1 / 2) of the receiver when the emitting light is received.
Test Rod
This is a rod for checking the detection capability of this device. Its dimensions correspond to
the minimum size of the object to be sensed by this device.
UL1998
UL standard for safety-related software in programmable components.
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