6 Troubleshooting
6.1 Step-by-step Troubleshooting
Check: LEDs
The option contains two LEDs to indicate the state of the device and the network. During normal operation the MS and at
least one NS LED shows a constant green light.
State LED Description
No power Off The device is un-powered
Device operational Green: Solid green The device is operational
Standby Green: Flashing green The device needs commissioning
Minor fault Red: Flashing red The device has detected a recoverable fault
Major fault Red: Solid red The device has detected an un-recoverable
fault
Self test
Red:
Flashing red/
green
The Modbus TCP option is in self-test mode
Green:
No IP address
Yellow
Steady yellow No IP address configured or obtained
Wink Yellow Flashing yellow Flash for 20 s
Table 6.1 MS: Module Status
State LED Description
No IP-address (no power) Off No link present (or is un-powered)
Connected Green: Solid green Link present; but nor winked and no ACD
Duplicate IP Red: Solid red
The IP-address assigned to the device is
already in use
Self test
Red:
Flashing red/
green
The Modbus TCP option is in self-test mode
Green
Device has been winked Yellow Flashing yellow Flash for 20 s
Link present at 10 Mbps Yellow Steady yellow Link present; but nor winked and no ACD
Table 6.2 NS1+NS2: Network Status (one per port)
Check: Link Status
The status of the Ethernet link cannot be directly identified
with the LEDs.
Use 12-10 Link Status, to verify presents of the link.
Use 12-11 Link Duration, to verify that the link is steady
present.
The parameter shows the duration of the present link, and
preset to 00:00:00:00 if the link is broken.
Check: Cabling
In rare cases of cabling mis-configuration, the option might
show the presents of a link, but no communication is
running. Exchange the cable in doubt.
Check: IP Address
Verify that the option has a valid IP address (refer to
3.1.1 IP Settings) in 12-01 IP Address. If the option has
identified a duplicate IP Address NS LEDs lights steady red.
If the option is set up for BOOTP or DHCP, verify that a
BOOTP or DHCP server is connected in 12-04 DHCP Server.
If no server is connected, the parameter shows:
000.000.000.000.
6.2 Alarm Word and Warning Word
Alarm word and warning word are shown in the display in
Hex format. If there is more than one warning or alarm, a
sum of all warnings or alarms is shown. Warning word and
alarm word are displayed in 16-90 Alarm Word to 16-95.
For more information on the individual alarms and
warnings, refer to the product relevant Design Guides.
Troubleshooting MCA 122 Modbus TCP
MG90P202 - VLT
®
is a protected Danfoss trademark 37
6 6
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