6-7
6 Troubleshooting and Maintenance
CJ-series User Defined CAN Unit Operation Manual for NJ-series CPU Unit (W517)
6-
3 Erro
r Log
Fu
nct
ion
s
6
6-
3-1 Err
or Lo
g T
ab
le
6-3
Error Log Functions
Errors detected by the User Defined CAN Unit are stored in the error log along with the date and time of
their occurrence. The error log can be read, cleared, and monitored using message commands.
Each time an error occurs, one error record is recorded in the User Defined CAN Unit’s RAM error log
table. The table can record up to 15 records. If another error occurs when the table is full, the oldest
record will be erased to make room for the new error record.
The error log table records the following information.
•
Error code
•
Detail code
•
Time of occurrence (The CPU Unit’s time is used for the time stamp.)
Error Log Storage Area
When an error is detected, information on the error and the time stamp are stored in the Unit’s inter-
nal RAM as an error log record. Serious errors are recorded in EEPROM as well as RAM*. The error
log records in EEPROM are retained even when the Unit’s power is turned OFF or the Unit is
restarted. The error log records in EEPROM are copied to RAM when the User Defined CAN Unit is
powered-up.
When the error log is read with a message command, only the error log records in RAM are read.
When the error log is cleared with a message command, the error log records in RAM and EEPROM
are erased.
6-3-2 Error Codes and Detail Codes
for a table listing the error codes.
Reading and Clearing the Error Log
The error log table can be read or cleared by sending a message command to the User Defined
CAN Unit. Use the User Defined CAN Unit’s unit address as the message command’s destination
unit address. (The unit address is the unit 10 Hex.).
Message command 2102 is used to read the error history. Issuing the message command 2103 will
clear the error log. Refer to
4-2 Unit Configuration and Control
for details on reading and clearing the
error log with message commands.
Additional Information
The CPU Unit’s time information is used for the time stamps in the User Defined CAN Unit’s error
log records. If the time information cannot be read from the CPU Unit, the time stamp will contain
all zeros.
Moreover, if the battery is replaced in an NJ-series controller, the time of the CPU Unit’s built-in
clock must be set again the next time that power is turned ON. If the built-in clock time is not set,
the correct time information will not be recorded. If this error log is read from the CPU Unit, the
time information will not be consistent.
6-3-1
Error Log Table
Содержание CJ1W-CORT21
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Страница 116: ...5 Communications Timing 5 10 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517...
Страница 134: ...6 Troubleshooting and Maintenance 6 18 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517...
Страница 140: ...Appendices A 6 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517...
Страница 141: ...Index 1 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517 I Index...
Страница 144: ...Index 4 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517 Index...