Handling Errors; Componet Master Unit Errors; Troubleshooting Sequence When An Error Occurs - Omron CJ Series Operation Manual

7 Troubleshooting
7-1

Handling Errors

This section describes how to handle CompoNet Network errors that may occur.
7-1-1

CompoNet Master Unit Errors

This section describes the meanings of the LED indicators and seven-segment 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 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-segment display shows the loca-
tion and content of errors.
7-1-2

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 CPU
Unit 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.
Check the probable cause of error and the onsite conditions, 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 restore system operation to normal.
The CompoNet Master Unit error detection function, operations following error detection, and coun-
termeasures are described on the following pages.
7-2 CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)