Error History Function - Omron CJ Series Operation Manual

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Error History Function

The error history registers errors detected by the CompoNet Master Unit, along with the clock times at
which they occur. You can monitor the error history from the CX-Integrator.
For the procedures to monitor the error history, refer to the CX-Integrator Version 2.
(Cat. No. W464).
Error History Table
Error History Table
Each time an error occurs, one record (up to a maximum of 64 records) is registered in the Error His-
tory 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
• Detail codes
• The clock times at which errors occurred (using the CPU Unit's time data)
Error History Save Area
When an error is detected, the contents of the error and the time at which it occurred are registered
as an error history in the Unit's internal RAM. Serious errors are registered not only in RAM but also
in EEPROM. The error history registered in EEPROM is saved during a power interruption or when
the Unit is restarted. When the CompoNet Master Unit is started, the error history in EEPROM is
copied to RAM. When you read the error history from the CX-Integrator, you are reading the error
history that is stored in RAM. When you clear the error history, it is cleared both from the RAM and
from EEPROM.
Precautions for Correct Use Precautions for Correct Use
The CPU Unit's time information is read and used by the CompoNet Master Unit. If this time
information cannot be read from the CPU Unit, all time information in the error history will show
0.
In addition, for an NJ-series CPU Unit, the time setting for the CPU Unit's built-in clock must be
reset when the power supply is turned ON after replacing the battery. If the time is not reset, cor-
rect time information will not be registered. When the error history is read, the time information
will be unreliable.
CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)
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