7 Troubleshooting
7.1 Troubleshooting
7.1.1 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 will show 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 seconds
Table 7.1: MS: Module Status
State
LED
Description
No IP-address (no power)
Off
No link present (or is un-powered)
Connected
Green:
Solid green
There is established (at least) one CIP connection to
the device
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 seconds
Link present at 10 Mbps
Yellow
Steady yellow
Link present; but nor winked and no ACD
Table 7.2: NS1 + NS2: Network Status (one per port)
Check: Link Status
The status of the Ethernet link cannot be directly identified by means of the LEDs.
Use par. EN-10,
Link Status
to verify presents of the link.
Use par. EN-11,
Link Duration
to verify that the link is steady present.
The parameter will show 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 (please refer to section: IP Settings) in par. EN-01,
IP Address
. If the option has identified a duplicate IP Address NS
LEDs will light steady red. If the option is set up for BOOTP or DHCP, verify that a BOOTP or DHCP server is connected in par. EN-04,
DHCP Server
. If no server is
connected, the parameter will show: 000.000.000.000.
Modbus TCP
47
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