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4.1 Daily Inspection
The following items should be inspected daily in order to maintain normal system
operation and prevent unnecessary trouble from occurring.
Item Inspection Description Action
Check the LED in
front of the power
module.
POWER (green): On when 5V
power supply is normal
Inspect the power supply
related items under "Periodic
Inspection" below.
Check the LED at the
front of the C2
module.
RUN (green): ON when
program is running normally.
See below
Check the LED of the
input module.
(Digital input)
When external input signal is
ON, the corresponding LED is
ON.
• Check that the input voltage
is within specification.
• Check that the input
terminal is secure.
• Check that the module is
secured.
Check the LED of the
output module.
(Digital output)
When output is ON,
corresponding LED is ON and
corresponding external load is
active.
LEDs indicating blown fuse
and external power failure
(FL, FH, or F) are OFF.
• Check that the external load
voltage is within
specification.
• Check the internal fuse.
• Check that the output
terminal is secure.
• Check that the module is
secured.
Action
• When the C3 module LED status is abnormal
The application program may be at fault if the error is not corrected after performing
the following. Check the application program once more.
(1) Restarting the C2 module.
(2) Replacing the C2 module.
Chapter 4 Maintenance