E
Emitter
The
light-emitting
component of a safety light screen 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.
Enable a Mute Time Limit
As soon as a mute sensor is mapped to a safety input device, a default
time
limit of 30s will show up in the
properties
window. This
time
limit
can be disabled by unchecking the ‘Enable Time Limit’ box. This extends
the
time
for the mutable safety device to be muted to
infinite.
External Device Monitoring (EDM)
A means by which a safety device (such as a safety light screen)
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.
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.
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.
I
IEC
International
Electrotechnical Commission
Internal Lockout
A Lockout
condition
that is due to an internal safety system problem.
Generally, indicated by the red Status indicator LED (only)
flashing.
Requires the
attention
of a
Qualified
Person.
K
Key Reset (Manual Reset)
A key-operated switch used to reset a safety light screen system to Run
mode following a Lockout
condition,
or to enable machine
operation
following a Latch
condition.
Also refers to the act of using the switch.
L
Latch
Condition
The response of the safety light screen safety outputs (for example,
OSSDs) when an object equal to or greater than the diameter of the
specified
test piece enters the
defined
area. In a Latch
condition,
safety
outputs simultaneously de-energize and open their contacts. The
contacts are held (latched) open
until
the object is removed from the
defined
area and a manual reset is performed. A latching output is used
most
often
in perimeter guarding
applications.
(See Trip
Condition
.)
Lockout
Condition
A safety light screen
condition
that is
automatically
attained
in response
to certain failure signals (an internal lockout). When a Lockout
condition
occurs, the safety light screen’s safety outputs turn
Off;
the failure must
be corrected and a manual reset is required to return the system to Run
mode.
EZ-SCREEN
®
Type 2 Light Screen
56
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