2-3
2 Components, Installation and Wiring
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
2-1
Com
p
o
n
ents and
Switc
h
Setting
s
2
2-1-2 I
ndicators
The indicators on the LED-display show the operating status of the Unit. The following table shows the
meaning of the indicators.
2-1-2
Indicators
LED
Colour
State
Description
RUN
Green
ON
Unit is in operation (i.e. Unit has initialized normally
after the Controller is reset or the Unit is restarted).
OFF
Any of the following
• No registration in Unit Configuration
• No power supply from Power Supply Unit
• Unit WDT error
• Unit hardware failure
ERC
Red
ON
Unit has operational failure due to a detected error.
(For a list of all the errors that can cause an opera-
tional failure, see 5-2 Error codes.)
OFF
Unit has no operational failure.
ERH
Red
ON
CPU Unit has operational failure. (For a list of all
the errors that can occur at the CPU Unit see 5-1
Error Indicators)
OFF
CPU Unit has no operational failure.
CH1/2
Green
ON
Channel 1/2 (i.e. Counter 1/2) is ready to count (the
corresponding counting gate is open).
OFF
Counter 1/2 is not ready to count (the correspond-
ing counting gate is closed).
A/B/ Z
Yellow
ON
Input A/B/Z has turned ON.
(Every Counter is characterised by the signals
A/B/Z.)
OFF
Input A/B/Z is turned OFF.
I0/I1
Yellow
ON
Digital Input (I0/I1) is turned ON.
OFF
Digital Input (I0/I1) is turned OFF.
O0/O1
Yellow
ON
Digital Output (O0/O1) is turned ON.
OFF
Digital Output (O0/O1) is turned OFF.
RUN
CH1
CH2
ERC
ERH
A
A
B
B
Z
Z
I0
I1
O0
O1
CT021