9-2
Section
Troubleshooting
161
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
Indicator
name
Meaning
Communication
U i
BF
Displays the BUS communications status.
Unit
US
Displays the Communication Unit status.
TS
Displays the I/O Unit interface status.
Basic I/O Unit
TS
Displays the I/O Unit interface status.
Special I/O Unit
TS
Displays the I/O Unit interface status.
p
/
U.ERR
Displays the Special I/O Unit status.
PWR
Displays the operating power supply status.
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.
No.
Communication
Unit US indicator
status
Cause
Remedy
6
OFF
US
The power is not being supplied.
Check the operating power supply, and provide the
correct power supply. If the problem persists, replace
the Communication Unit.
7
Flashing (green)
US
Initialisation failure of
Communication Unit.
Check other led indicators for failure cause.
8
ON (red)
US
A hardware error has occurred in
the Communication Unit.
Restart the Communication Unit. If the problem
persists, replace the Communication Unit.
9
Flashing (red)
US
Special I/O Units have been
parameterized.
Restart the Communication Unit. If the problem
persists, replace the Communication Unit.
10
ON (green)
US
No error
Proceed to the next item,
Causes and Remedies for
Communication Unit BF indicator Errors
.
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.
No.
Communication
Unit BF indicator
status
Cause
Remedy
11
ON (red)
BF
The Unit is in Bus Off status.
Check the connection status of the PROFIBUS-DP
communications cable or the noise status.
A Slave already exits with the
same node number as the
Communication Unit.
Communication Unit not properly
configured.
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.
12
OFF
BF
No error
Proceed to the next item,
Causes and Remedies for
Communication Unit and I/O Unit TS Indicator Errors
.
Troubleshooting via
Indicators