12 Glossary
A
ANSI (American National Standards Institute)
Acronym for the American National Standards
Institute, an association of industry representatives
that develops technical standards (including safety
standards). These standards comprise a consensus
from a variety of industries on good practice and
design. ANSI standards relevant to application of
safety products include the ANSI B11 Series, and
ANSI/RIA R15.06. See .
Auto Power-Up
A safety light curtain system feature that enables the
system to be powered up into Run mode (or recover
from a power interruption) without requiring a manual
reset.
Auto Start/Restart (Trip) Condition
The safety outputs of a safety light curtain system
turn off when an object completely blocks a beam. In
an Auto Start/Restart condition, the safety outputs re-
energize when the object is removed from the defined
area.
Auto Start/Restart (Trip) Initiate
The resetting of a safeguard causing the initiation of
machine motion or operation. Auto Start/Restart
Initiate is not allowed as a means to initiate a machine
cycle per NFPA 79 and ISO 60204-1, and is
commonly confused with PSDI.
B
Blanking
A programmable feature of a safety light curtain
system which allows the light curtain to ignore certain
objects located within the defined area. See
Floating
Blanking
and
Reduced Resolution
.
Blocked Condition
A condition that occurs when an opaque object of
sufficient size blocks/interrupts one or more light
curtain beams. When a blocked condition occurs,
OSSD1 and OSSD2 outputs simultaneously turn off
within the system response time.
Brake
A mechanism for stopping, slowing, or preventing
motion.
C
Cascade
Series connection (or "daisy-chaining") of multiple
emitters and receivers.
CE
Abbreviation for "Conformité Européenne" (French
translation of "European Conformity"). The CE mark
on a product or machine establishes its compliance
with all relevant European Union (EU) Directives and
the associated safety standards.
Clutch
A mechanism that, when engaged, transmits torque
to impart motion from a driving member to a driven
member.
Control Reliability
A method of ensuring the performance integrity of a
control system or device. Control circuits are
designed and constructed so that a single failure or
fault within the system does not prevent the normal
stopping action from being applied to the machine
when required, or does not create unintended
machine action, but does prevent initiation of
successive machine action until the failure is
corrected.
CSA
Abbreviation for Canadian Standards Association, a
testing agency similar to Underwriters Laboratories,
Inc. (UL) in the United States. A CSA-certified product
has been type-tested and approved by the Canadian
Standards Association as meeting electrical and
safety codes.
D
Defined Area
The "screen of light" generated by a safety light
curtain system, defined by the height and the safety
distance (minimum distance) of the system.
Designated Person
A person or persons identified and designated in
writing, by the employer, as being appropriately
trained and qualified to perform a specified checkout
procedure.
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®
LS Basic Safety Light Curtain
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