Publication 1752-UM001A-EN-P - October 2006
Status Indicators 139
Identifying Errors Using
Status Indicators
Use these tables to interpret the color and status combinations of the
LED and alphanumeric display indicators and take corrective action
where applicable.
Critical Errors
Indicators
Error Log Cause Corrective Action
MS NS Alphanumeric
Display Code
Off Off Off None Critical hardware fault.
Noise level higher than expected.
1. Cycle the power supply.
2. Check external wiring.
3. Take corrective actions for
noise.
4. Contact Rockwell Automation.
Red, On Off Left: H
Right: ---
System Failure Critical hardware fault.
Noise level higher than expected.
Output terminal shorted to 24V dc
before operation.
Abort Error
Indicators
Error Log Cause Corrective Action
MS NS Alphanumeric
Display
(1)
Code
Red,
Flashing
Green,
On or
Flashing
E8 Switch setting
mismatch
The node address and baud rate
were changed after the normal
completion of configuration
download.
1. Set switches properly.
2. Reconfigure the device.
(1) Display alternates between error code and node address of the error.
Nonfatal Errors
Indicators
Error Log Cause Corrective Action
MS Alphanumeric
Display
(1)
Code
I/O
Red, On F0 --- Duplicate MAC ID The same node address is set for
more than one node.
Check that node addresses have
not been duplicated and
reconfigure the device if
necessary.
Red, On F1 --- Bus Off Communications are cut off
because of frequent data errors.
1. Make sure the communication
rate is the same for all nodes.
2. Check that cables are not
loose, disconnected, or too
long.
3. Verify that terminating
resistors have been installed
only at both ends of the main
line.
4. Take corrective action for
noise.
5. Cycle the power supply.
Red,
Flashing
L9 --- Standard I/O
Connection Timeout
Standard I/O connection timeout.
Red,
Flashing
dA --- Safety I/O
Connection Timeout
Safety I/O connection timeout.
Red,
Flashing
d5 --- Nonexistent Slave
Device
No slave detected.
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