RAM Error - Work/Standard/Extended RAM

What does 1102 mean?

The work area RAM in the CPU module, or the standard and extended RAM areas, are faulty. This diagnostic occurs at power ON, after a reset, or when an END instruction is executed.

• Faulty work area RAM in the CPU module.
• Faulty standard RAM and/or extended RAM in the CPU module.

Click steps to track your progress.

1. 1

   Measure the incoming supply voltage to the PLC's power supply module and verify it adheres to the specified voltage range.

2. 2

   Inspect the CPU module to ensure it is correctly and securely seated in its base unit; re-seat the module firmly if any looseness is detected.

3. 3

   Verify the status of the CPU module's backup battery (if present) using its status indicators, and measure its voltage if safely accessible and within specification.

4. 4

   Inspect the CPU module, its base unit connector, and the backplane for any signs of physical damage, corrosion, or foreign material.

5. 5

   Verify that the operating environment's temperature and humidity are within the specified limits for the MELSEC Q/L Series system.