Instruction Manual

Component Description 3-11
The Light Curtain receiver has the following LED operating status indicators:
• Green (CLEAR)
• Red (BLOCKED)
• Yellow (RESET)
Table 3-1 describes the meaning of each indicator color. For more information, see the manual included
with your Light Curtain.
Table 3-1 Light Curtain Status Indicators
Indicator Indicator Color / Behavior Status Condition
Emitter
Green LED ON Power is ON.
Green and Yellow ON Steadily
The Light Curtain System has been
reset and is in the RUN mode, the
defined area is clear of
obstructions, and the emitter and
receiver are properly aligned.
Green ON and flashing
Fixed and/or floating blanking is
ON (see OEM Light Curtain
manual).
Red LED ON Steadily and Yellow
Single-flashing (Blocked)
The Light Curtain System has been
reset and is in the RUN mode, but
either there is an obstruction in the
defined area or the emitter and
receiver are misaligned.
Red (only) ON and Flashing
A lockout condition due to an
internal Light Curtain System
problem exists.
Yellow (only) ON and
Single-flashing
Displays sensor alignment. The
faster the flash rate, the more
beams are “made,” and the fewer
beams are blocked or “not made.”
If alignment is correct, the green
indicator will come ON (to join
yellow) when the obstruction is
removed. If alignment is not
correct, the green indicator will
remain OFF when the obstruction
is removed.
Yellow (only) ON and
Double-flashing
A double-flashing yellow indicator
indicates a power-up or power
interrupt lockout condition. These
lockouts occur in the normal course
of powering up the Light Curtain or
upon an interruption of power to the
System (unless Auto Power-up is
ON).
Receiver
Yellow (only) ON Steadily
The key switch has been switched
to the RESET position at power-up.