- 99 -
Trouble
No.
Trouble
Possible
cause
How to diagnose the trouble
Solutions
1
LED is OFF
Power fault
Check if the LED (green) of the
controller is lit.
The power supply, voltage or current
should be modified to an appropriate one.
→5. External Wiring Diagram
→6. CN1: Power supply connector details
Wiring fault
Is the wiring connected
correctly?
Check if the wiring is connected correctly
or if there is broken wire or short-circuit
by referring to this Operation Manual.
Correct the wiring and check that the
input/output of each signal is correct.
Separate the power supply for the
CN1controller and the CN5 I/O signal
power supply.
→ 5. External Wiring Diagram
→10. Memory map
2
L RUN and L
ERR LED are
ON/OFF
CPU ALM
Are both the L RUN (green) and
L ERR (red) LED ON?
It is possible that the CPU or surrounding
circuits have failed, or the CPU is
malfunctioning due to electrical noise.
If the alarm is still generated when power
is reapplied, please contact SMC.
CC-Link
communication
error
What are the states of the L
RUN (green) and L ERR (red)
LED?
Take appropriate measures by referring
to and following the controller operation
manual.
⇒
8. LED Display
⇒
16.
Alarm Detection for CC-Link
Communication
3
ALM is ON
Alarm
condition
Check if the controller is in the
alarm condition.
Refer to the controller operation manual,
and take appropriate measures. Take
appropriate measures based on the
operation manual.
⇒
15. Alarm Detection of Motor Control
4
Communication
fault. (LEC-W2)
USB driver is
not installed
Check that the USB driver for
the communication cable is
installed.
Please install the USB driver of USB
cable.
The USB driver's installation starts when
the communication cable is connected
with PC. Refer to the Installation Manual
for setting kit (LEC-W2) for the
installation procedure.
Incorrect COM
port setting
Please confirm if the correct
COM port is set to the controller
setting kit.
The COM port allocated to the
communication cable is different for
different PC’s. Please confirm the COM
port number with the communication
cable connected.
The COM port number can be checked
using the Device Manager of the PC.
Refer to the Installation Manual for
controller setting kit (LEC-W2) for the
checking and setting method for COM
port numbers.
