OMRON CJ series PLC operation and maintenance essentials

4. Error log operation

Read error logs: Operate through the "Error Log" window of CX Programmer or programming console.

Clear error log pointer: Set A50014 to ON (which will automatically reset), pointer A300 will reset to zero, but the log content will not be cleared.

User defined error: Using FAL (006) generates a non fatal error, while FALS (007) generates a fatal error with error codes 4101-42FF (FAL) or C101-C2FF (FALS).

Notification function for power unit replacement

The CJ1W-PA205C power unit has a "replacement notification" function. The aging degree of the electrolytic capacitor is monitored internally, and the remaining life is displayed through the 7-segment LED on the front panel

FUL: Adequate lifespan

HLF: Half of the lifespan

1.5/1.0/0.5: Remaining years

0.0 and A02 alternate flashing: The remaining lifespan is less than 6 months, and the alarm output (normally open contact) is disconnected.

The alarm output (ALARM) is a transistor output, which is ON (conductive) under normal conditions and OFF when it needs to be replaced. This signal can be connected to the PLC input point for triggering maintenance reminders in the program.

TEST switch: Press for more than 3 seconds to force the display of "A02" and temporarily turn off the alarm output, used for testing external circuits. Release and restore to normal.

Attention: If the power unit is stored for a long time (more than 3 months), it is recommended to maintain an ambient temperature of -20~30 ° C and a humidity of 25%~70% to maintain the accuracy of the replacement notification function.

Battery replacement steps

The CJ1-H/CJ1 CPU unit uses CPM2A-BAT01 batteries, while the CJ1M uses CJ1W-BAT01. The battery life is about 5 years at 25 ° C, and the shortest at 55 ° C is about 0.75 years (CJ1-H) or 1.5 years (CJ1M).

Replacement steps:

Ensure that the CPU unit has been powered on for at least 5 minutes (to charge the backup capacitor).

Turn off the CPU unit (or do not power on but release static electricity).

Open the battery compartment cover in the upper left corner of the CPU unit and carefully pull out the battery.

Unplug the battery connector, replace it with a new battery, and plug in the connector.

Put the battery back into the compartment and close the lid.

Re power on, the battery error flag A40204 will automatically clear.

Warning: The battery replacement time should not exceed 5 minutes (the backup capacitor can be maintained for about 5 minutes after power failure). If there is not enough time, the CPU unit can be kept powered on for replacement (but anti-static is required).

Maintenance suggestions

Regular inspection: Check the environmental temperature (0-55 ° C), humidity (10% -90% without condensation), dust, vibration, and terminal fastening every six months.

Cooling fan: If installed in a closed control cabinet, ensure good ventilation and install a fan if necessary.

Program backup: Use a memory card for simple backup (DIP switch pin 7+press the memory card power switch), which can backup user programs, parameters, I/O comments, function block definitions, etc. to the memory card at once. Perform the same operation during recovery.

Cycle monitoring: Monitor system load through A262/A263 (maximum cycle time) and A264/A265 (current cycle time), and adjust program structure or hardware configuration in a timely manner.