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May 22, 2023
EZ-SCREEN SLS Safety Light Curtain Instruction Manual
109
Hazardous Area
An area that poses an immediate or impending physical hazard.
I
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 curtain system to Run mode following a Lockout condition, or to enable
machine operation following a Manual Start/Restart (Latch) condition. Also refers to the act of using the switch.
L
Lockout Condition
A safety light curtain condition that is automatically attained in response to certain failure signals (an internal lockout).
When a Lockout condition occurs, the safety light curtain’s safety outputs turn OFF; the failure must be corrected and a
manual reset is required to return the system to Run mode.
M
Machine Primary Control Element (MPCE)
An electrically powered element, external to the safety system, which directly controls the machine’s normal operating
motion in such a way that the element is last (in time) to operate when machine motion is either initiated or arrested.
Machine Response Time
The time between the activation of a machine stopping device and the instant when the dangerous parts of the machine
reach a safe state by being brought to rest.
Manual Start/Restart (Latch) Condition
The safety outputs of a safety light curtain system turn off when an object completely blocks a beam. In a Manual Start/
Restart condition, the safety outputs stay off when the object is removed from the defined area. To re-energize the out-
puts, perform a proper manual reset.
Minimum Object Sensitivity (MOS)
The minimum-diameter object that a safety light curtain system can reliably detect. Objects of this diameter or greater will
be detected anywhere in the defined area. A smaller object can pass undetected through the light if it passes exactly mid-
way between two adjacent light beams. Also known as MODS (Minimum Object Detection Size). See also
Specified Test
Piece.
Muting
The automatic suspension of the safeguarding function of a safety device during a non-hazardous portion of the machine
cycle.
O
OFF State
The state in which the output circuit is interrupted and does not permit the flow of current.
ON State
The state in which the output circuit is complete and permits the flow of current.
OSHA (Occupational Safety and Health Administration)
A U.S. Federal agency, Division of the U.S. Department of Labor, that is responsible for the regulation of workplace safe-
ty.
OSSD
Output Signal Switching Device. The safety outputs that are used to initiate a stop signal.
P
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