Omron CJ/CS Series Error Code D01

Omron PLC & VFD Major Memory

Model: CJ/CS Series | Code: D01

Applicable Systems
CJ/CS Series

Symptoms

The CJ/CS Series reports a parameter loss fault. One or more parameters were lost from non-volatile memory due to corruption or battery failure.

Possible Causes

  • Battery failure causing memory data loss during power-off
  • EEPROM corruption due to electrical noise or write interruption
  • Memory chip degradation due to age or thermal stress

Troubleshooting Steps

  1. Step 1: Check the battery voltage and replace if depleted
    Battery voltage is adequate
  2. Step 2: Reload all parameters from a known-good backup or from nameplate values
    Parameters are restored correctly
  3. Step 3: Save the parameters to EEPROM and verify the write
    Parameters are stored successfully

How to Reset

To reset: Reload and re-save all parameters, then cycle power and restart.

Related Omron Fault Codes

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Source: Omron CJ/CS Series PLC Programming Manual, Omron Corporation

Category: PLC & VFD