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Glossary of Terms
Panasonic ST4 Instruction Manual
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 safety light curtain is able to detect objects. The actual size of this
range depends on the safety light curtain 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.
UL1998
UL standard for safety-related software in programmable components.
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