Hello, I’m curious about how the Micro Logix 1500 maintains its PLC program during power outages. The unit I have doesn’t include a backup battery or memory module, and I’ve been unable to find any information on this in the user manual. Any insights would be greatly appreciated. Thank you!
Based on the document I have in my possession, the source is uncertain, but it is likely an old knowledge base article from a time when such resources were freely available ("A long time ago in a galaxy far, far away"). This article discusses the **lifetime of batteries for the MicroLogix 1500 PLC**. **1. Expected Lifetime of the Permanent (Non-replaceable) Battery:** Under standard operating conditions, the lifespan of the permanent battery is typically **7 to 8 years**. It’s crucial to note that "normal" conditions are key; extreme temperatures and adverse environmental factors can significantly reduce battery longevity. **2. Expected Lifetime of the Replacement Battery (1747-BA):** If the replacement battery is installed when the primary battery is nearing its end, it can extend the device's functionality by an additional **3 to 5 years**. Conversely, if the replacement battery is added at the time of processor installation, it can provide an extra **1 to 2 years** of total life. **3. Functions of the Two Batteries in the Processor:** The permanent battery serves a critical role as it is designed for memory backup. Should the processor’s operational life exceed the permanent battery's lifespan, the replacement battery (1747-BA) can be installed to preserve memory. This replacement battery is essential for prolonging the overall operational life of the system. Both batteries are configured in parallel and include diode protection between them. **4. Expected Lifetime of the RTC Module Battery:** Both the **1764-RTC** and **1764-MM1RTC** modules use a built-in battery that is non-replaceable, with an anticipated lifetime of approximately **5 years**. For more information on battery longevity and maintenance of the MicroLogix 1500 PLC, feel free to click to expand!
Thank you, Mickey! I appreciate your help. I can install a second battery to ensure a reliable backup, and the low battery indicator will alert me when it’s time to replace that secondary battery. I understand that I should not tamper with the primary battery at all. Thanks again!
Hi there! The MicroLogix 1500 actually uses EEPROM memory for storing the PLC program, which means it retains the program even during power outages, so you shouldn't lose any data. However, it's important to keep in mind that while the program is safe, any real-time data or status will be lost if there’s a power failure. If you need more detailed info on how to manage it or any specific configurations, checking out the Rockwell Automation forums or support can be really helpful too. Hope this helps!
Hey! The MicroLogix 1500 actually has non-volatile memory built into it, so it should retain its program even without a battery or additional memory module when the power goes out. However, it’s always a good idea to periodically back up your program to a PC, just in case. If you're noticing any issues with retaining the program, you might want to check the firmware version or any specific settings in the controller. Hope that helps!
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