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Handling Errors Section 8-1
8-1 Handling Errors
This section describes how to handle CompoNet Network errors that may
occur.
8-1-1 CompoNet Master Unit Errors
This section describes the meanings of the LED indicators and seven-seg-
ment display when errors occur at a CompoNet Master Unit, and it provides
countermeasures for handling the errors.
Meanings of CompoNet Master Unit Indicators and Procedure for Handling Errors
CompoNet Master Units are designed to follow the same basic procedures as
CS/CJ-series Special I/O Units for handling errors.
When an error occurs at a Special I/O Unit, the general location of the error is
shown by the status of the indicators.
With CompoNet Master Units, in addition to these indicators, a seven-seg-
ment display shows the location and content of errors.
8-1-2 Troubleshooting Sequence When an Error Occurs
1. Determine the general location of the error.
Check the pattern in which the indicators are lit to determine whether the
error occurred in the PLC or in the network.
↓
2. Determine the details.
Check the seven-segment display and the status area of the CompoNet
Master Unit to determine the location and content of the error.
↓
3. Determine the cause of the error.
Consider the onsite conditions in relation to the circumstances of the error,
and determine and clear the cause of the error.
↓
4. Take countermeasures.
Check the system status in the Unit operation after error detection column,
check the required operations in the Countermeasures column, and re-
store system operation to normal.
The CompoNet Master Unit error detection function, operations following error
detection, and countermeasures are described on the following pages.
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