E
Emitter
The light-emitting component of a safety light curtain
system, consisting of a row of synchronized
modulated LEDs. The emitter, together with the
receiver (placed opposite), creates a "screen of light"
called the defined area.
External Device Monitoring (EDM)
A means by which a safety device (such as a safety
light curtain) actively monitors the state (or status) of
external devices that may be controlled by the safety
device. A lockout of the safety device will result if an
unsafe state is detected in the external device.
External device(s) may include, but are not limited to:
MPCEs, captive contact relays/contactors, and safety
modules.
F
Failure to Danger
A failure which delays or prevents a machine safety
system from arresting dangerous machine motion,
thereby increasing risk to personnel.
Final Switching Device (FSD)
The component of the machine’s safety-related
control system that interrupts the circuit to the
machine primary control element (MPCE) when the
output signal switching device (OSSD) goes to the
OFF-state.
Fixed Blanking
A programming feature that allows a safety light
curtain system to ignore objects (such as brackets or
fixtures) which will always be present at a specific
location within the defined area. The presence of
these objects will not cause the system’s safety
outputs (for example, Final Switching Devices) to trip
or latch. If any fixed objects are moved within or
removed from the defined area, a Lockout condition
results.
Floating Blanking
See
Reduced Resolution
.
FMEA (Failure Mode and Effects Analysis)
A testing procedure by which potential failure modes
in a system are analyzed to determine their results or
effects on the system. Component failure modes that
produce either no effect or a Lockout condition are
permitted; failures which cause an unsafe condition (a
failure to danger) are not. Banner safety products are
extensively FMEA tested.
G
Guarded Machine
The machine whose point of operation is guarded by
the safety system.
H
Hard (Fixed) Guard
Screens, bars, or other mechanical barriers affixed to
the frame of the machine intended to prevent entry by
personnel into the hazardous area(s) of a machine,
while allowing the point of operation to be viewed.
The maximum size of the openings is determined by
the applicable standard, such as Table O-10 of OSHA
29CFR1910.217, also called a "fixed barrier guard."
Harm
Physical injury or damage to the health of people,
which may result through direct interaction with the
machine or through indirect means, as a result of
damage to property or to the environment.
Hazard Point
The closest reachable point of the hazardous area.
Hazardous Area
An area that poses an immediate or impending
physical hazard.
S4B Safety Light Curtain
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