How does Mitsubishi PLC replace the battery program without losing it? -Solutions - Huaqiang Electronic Network

SMD Aluminum Electrolytic Capacitor

LED Lamp Bead Patch Lighting Products 0805 White Light Super Bright Indicator Light Dedicated

Full Range of MOS Power ICs

Many customers have asked about replacing the battery in Mitsubishi PLCs. Here are some common questions and answers to help you understand the process better.

1. How long does it take to replace the internal battery of a Mitsubishi PLC?

2. What is the correct way to replace the internal battery of a Mitsubishi PLC?

3. Will the PLC program be lost after replacing the battery?

I will go through each question one by one to provide you with a clear understanding and helpful guidance.

**First, Understanding the Battery Life and Replacement Standards for Mitsubishi PLCs**

The type of memory used in the PLC determines how often the battery needs to be replaced. For example, if your PLC uses a lithium battery, it typically lasts around 5 years under normal conditions. However, this can vary depending on usage and environmental factors.

It's important to note that even if the battery appears to be working, it may still need replacement to prevent unexpected shutdowns or data loss. Always use high-quality batteries from trusted manufacturers to ensure reliability and safety.

**Second, Step-by-Step Guide to Replacing the Internal Battery**

When the battery voltage drops, the “BATT.V” LED on the panel will light up. This indicates that the battery should be replaced as soon as possible. Although the system may function for a month after the indicator lights up, it’s best to act quickly to avoid any potential issues.

Here are the steps to replace the battery:

1. Turn off the power supply to the PLC.

2. Hold the left corner of the panel cover and lift the right side to remove it.

3. Carefully remove the old battery from its holder and disconnect the socket.

4. Insert the new battery into the socket within 20 seconds of removing the old one.

5. Place the new battery into the holder and reattach the panel cover.

**Third, How to Replace the Battery Without Losing the PLC Program**

If your PLC has an EPROM or a memory card, the program will not be lost if it has been backed up or downloaded to a computer. However, if no backup exists, the program could be lost during the battery replacement process.

There are two effective ways to replace the battery without losing the program:

1. For FX series PLCs, the battery can be replaced within 30 seconds without affecting the program.

2. Alternatively, you can use an external power supply to maintain power during the replacement, ensuring no program loss occurs.