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Error History Function Section 8-2
Repeater Unit Errors The following indicator patterns show that a Repeater Unit has detected an
error.
Indicators
: Lit
: Flashing
: Not lit
---: Not applicable
8-2 Error History Function
The error history registers errors detected by the CompoNet Master Unit,
along with the times at which they occur. The recorded results can be read
and cleared by FINS commands to the CompoNet Master Unit. They can also
be monitored using the CX-Integrator.
Error History Table
Error History Table Each time an error occurs, one record (up to a maximum of 64 records) is reg-
istered in the Error History Table in the CompoNet Master Unit's internal RAM.
Once the maximum number of records (64) has been registered in the Error
History Table, the oldest record is deleted in order with each new record that
is registered.
The following information is stored in the Error History Table.
• Error codes
MS
indicator
NS
indicator
Item Probable cause of error Unit operation
after error
detection
Countermeasures
Not lit
---
No power supply The specified power supply volt-
age is not being supplied from the
communications power supply.
Repeater Unit
operation stops.
Remove the cause of the error, and turn ON the power
again. If the Repeater Unit still does not operate nor-
mally when the power supply voltage is being supplied
in the specified range, then replace the Repeater Unit.
Green Red
Communications
error
Remote I/O communications with
the Master Unit timed out and
stopped after a connection had
been established.
Repeater Unit
operation contin-
ues.
Any of the following may be the cause of the communi-
cations error. Check and remove the cause of the
error.
1) Operation was stopped by a PLC System error,
including the Master Unit.
Check the PLC System status and clear the error.
There is no need to restart the Repeater Unit.
2) Communications with the Master Unit are impossi-
ble because of a problem such as a disconnected
line or a malfunction.
Check the cables, terminals, and Repeater Units.
Clear the error, and then turn the communications
power supply back ON again.
3) Communications with the applicable Unit had to
continue to be retried because of noise. The num-
ber of retries exceeded the specified value, so the
Master Unit stopped communications.
Check for noise interference around the affected
Unit.
Aside from 1) above, there is no need to restart the
Master Unit.
Green Red
Address duplica-
tion error
A Repeater Unit with the same
node address exists on the net-
work.
Repeater Unit
operation stops.
Check and correct the Repeater Unit's node number,
and then perform the following procedure:
1) Turn OFF the communications power supply for the
Master Unit and the Repeater Unit.
2) Turn the communications power supply back ON
again.
Red
---
Unit error An error occurred at the Repeater
Unit itself for one of the following
reasons.
1) The Repeater Unit failed to
write to internal memory
(EEPROM).
2) The Repeater Unit failed to
read internal memory
(EEPROM).
Repeater Unit
operation stops.
To eliminate the first possibility, check the set value for
the Repeater Unit's node address. Then restart the
Repeater Unit (i.e., turn the communications power
supply OFF and back ON again). If the same error
occurs again, replace the Repeater Unit.
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