Omron PRT1-COM Operation Manual page 170

Troubleshooting
Troubleshooting via
Indicators
No. Communication
Unit US indicator
status
6 OFF
US
7 Flashing (green)
US
8 ON (red)
US
9 Flashing (red)
US
10 ON (green)
US
No. Communication
Unit BF indicator
status
ON (red)
11
BF
12 OFF
BF
There are indicators that display the Unit status of each MULTIPLE I/O
TERMINAL Unit. The contents and causes of errors can be found by checking
these indicators.
Indicator Meanings
Unit
Communication
U i Unit
Basic I/O Unit
Special I/O Unit p /
In addition to the above indicators, some Units also have indicators that display
the I/O status.
Causes and Remedies for Communication Unit US Indicator Errors
First use the Communication Unit US indicator to check the status of the
Communication Unit, and then take action according to the following table.
Cause
The power is not being supplied.
Initialisation failure of
Communication Unit.
A hardware error has occurred in
the Communication Unit.
Special I/O Units have been
parameterized.
No error
Causes and Remedies for Communication Unit BF indicator Errors
Next use the BF indicator to check the status of the Communication Unit, and
then take action in according to the following table.
Cause
The Unit is in Bus Off status.
A Slave already exits with the
same node number as the
Communication Unit.
Communication Unit not properly
configured.
No error
Indicator
name
BF Displays the BUS communications status.
US Displays the Communication Unit status.
TS Displays the I/O Unit interface status.
TS Displays the I/O Unit interface status.
TS Displays the I/O Unit interface status.
U.ERR Displays the Special I/O Unit status.
PWR Displays the operating power supply status.
Check the operating power supply, and provide the
correct power supply. If the problem persists, replace
the Communication Unit.
Check other led indicators for failure cause.
Restart the Communication Unit. If the problem
persists, replace the Communication Unit.
Restart the Communication Unit. If the problem
persists, replace the Communication Unit.
Proceed to the next item, Causes and Remedies for
Communication Unit BF indicator Errors.
Check the connection status of the PROFIBUS-DP
communications cable or the noise status.
Reset the node number so that it is not duplicated.
Re-configure the PROFIBUS-DP Unit.
After taking the above measures, restart the
Communication Unit. If the problem persists, replace
the Communication Unit.
Proceed to the next item, Causes and Remedies for
Communication Unit and I/O Unit TS Indicator Errors.
Section
Meaning
Remedy
Remedy
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