MS - Module status LED
The bicolor (green/red) LED indicates the status of the device. It indicates whether
or not the device has power and is operating properly. The LED is controlled by
software. The following table shows the different states of the MS LED.
Remedy/cause
Description
LED color
Check power supply.
The device has no power.
OFF
The device has not completed the
startup.
If no light, check other LED modes.
Device is operating in a normal
condition.
GREEN steady
Check system parameters.
Device needs commissioning due
to missing, incomplete or incorrect
configuration. The device may be in
the stand-by state.
GREEN flashing
Check messages.
Check messages.
Recoverable minor fault.
RED flashing
Device may need replacing.
The device has an unrecoverable
fault.
RED steady
If flashing for more than a few
seconds, check hardware.
The device is running startup self
test.
RED/GREEN
flashing
NS - Network status LED
The bicolor (green/red) LED indicates the status of the communication link. The
LED is controlled by software. The following table shows the different states of the
NS LED.
Remedy/cause
Description
LED color
Check status of MS LED.
The device has no power or is not
online.
OFF
Check power supply.
The device has not completed the
startup.
If no light, check other LED modes.
The device is online and has connec-
tion in the established state.
GREEN steady
Check that other nodes in the net-
work are operative.
Device is online, but has no connec-
tions in the established state.
GREEN flashing
Check parameter to see whether
module has correct ID.
Check system messages.
One or more I/O connections are in
the time-out state.
RED flashing
Check system messages and para-
meters.
Failed communication device. The
device has detected an error render-
ing it incapable of communicating
on the network.
RED steady
(Duplicate MAC_ID, or Bus-off).
Status LEDs at power-up
The system performs a test of the MS and NS LEDs during startup. The purpose
of this test is to check that all LEDs are working properly. The test runs as follows:
LED action
Order
NS LED is switched Off.
1
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36
Application manual - Discrete I/O
3HAC070208-001 Revision: C
© Copyright 20192020 ABB. All rights reserved.
2 Hardware overview
2.4 Status LED descriptions
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Summary of Contents for Discrete I/O
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