Chapter 8 Option CardsMH300
8-30
8-10-5 LED Indicator Light & Troubleshooting
There are three LED indicator lights on CMM-DN02. POWER LED displays the status of the
working power. MS LED and NS LED are dual-color LEDs, displaying the connection status and
error messages of the communication module.
POWER LED
LED status Indication Corrective Action
ON Working power is in normal status
No action is required
OFF No power
Check if the connection between the CMM-DN02
and the AC motor drive is normal.
Table 8-21
NS LED
LED status Indication Corrective Action
OFF
No power supply or CMM-DN02
does not pass the MAC ID test.
1. Check the power to input CMM-DN02 and see if the
connection is normal.
2. Make sure there is at least one node on the bus.
3. Check if the baud rate of CMM-DN02 is the same
as that of the other nodes.
Green light
flashes
CMM-DN02 is on-line but does
not connect to the master.
1. Configure CMM-DN02 to the scan list of the master.
2. Re-download the configured data to the master.
Green light is
ON
CMM-DN02 is on-line and
normally connects to the master.
No action is required.
Red light
flashes
CMM-DN02 is on-line, but I/O
connection is timed-out.
1. Check if the network connection is normal.
2. Check if the master operates normally.
Red light is ON
1. Broken communication.
2. MAC ID test failure.
3. No network power supply.
4. CMM-DN02 is off-line.
1. Make sure all MAC IDs on the network are unique.
2. Check if the network installation is normal.
3. Check if the baud rate of CMM-DN02 is the same
as that of the other nodes.
4. Check if the node address of CMM-DN02 is illegal.
5. Check if the network power supply is normal.
Table 8-20
MS LED
LED status Indication Corrective Action
OFF
No power supply or device is off-
line
Check the power supply of CMM-DN02 and see if the
connection is normal.
Green light
flashes
Waiting for I/O data Switch the master PLC to RUN status.
Green light is
ON
I/O data is normal No action is required.
Red light
flashes
Mapping error
1. Reset CMM-DN02
2. Re-power the AC motor drive
Red light is ON Hardware error
1. See the fault codes displayed on the keypad and
find the causes.
2. Return the unit to the factory for repair if necessary.
Orange light
flashes
CMM-DN02 is connecting with
the AC motor drive.
If the flashing lasts for a long period of time, turn off
the power to check if the CMM-DN02 and the AC
motor drive install correctly and are normally
connected to each other.
Table 8-21
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