The **2080-MEMBAK-RTC** is a plug-in expansion module for the Allen-Bradley **Micro800** series of Programmable Logic Controllers (PLCs), specifically designed for the **Micro820**, **Micro830**, **Micro850**, and **Micro870** controllers. It serves two primary functions: providing a Real-Time Clock (RTC) and offering external memory backup. --- ### 1. Key Technical Components The module consists of the following electronic sub-systems: | Component | Description | | :--- | :--- | | **Real-Time Clock (RTC)** | An integrated circuit that keeps track of the current time (Hours, Minutes, Seconds) and date (Day, Month, Year). | | **Battery (Internal)** | A non-replaceable lithium battery that powers the RTC chip when the PLC is disconnected from its main power source. | | **Flash Memory** | Non-volatile memory used to back up the user program, project data, and recipe files from the PLC's internal RAM. | | **Gold-Plated Pins** | The physical interface that connects to the PLC's "Plug-In" port, ensuring high-speed data transfer and power delivery. | --- ### 2. Functional Features #### A. Real-Time Clock (RTC) The Micro830 and some versions of the Micro850 do not have a built-in clock. This module provides: * **Time-Stamping:** Allows the PLC to record exactly when an event or alarm occurred. * **Scheduling:** Enables the PLC to trigger operations based on specific times (e.g., turning on lights at 6:00 PM). #### B. Memory Backup (MEMBAK) The "MEMBAK" portion functions similarly to a "Project Recovery" drive: * **Program Portability:** You can download a project to the module and move it to another PLC of the same model. * **Data Protection:** It protects the project against corruption or accidental deletion. * **Restore on Power-up:** The PLC can be configured to automatically load the program from the 2080-MEMBAK-RTC upon startup. --- ### 3. Specifications Summary | Feature | Specification | | :--- | :--- | | **Compatibility** | Micro820, Micro830, Micro850, Micro870 | | **Installation** | Plug-in Slot (no wiring required) | | **Dimensions** | 31.1 x 32.2 x 19.3 mm | | **Operating Temp** | -20°C to 65°C (-4°F to 149°F) | | **Battery Life** | Typically 5-10 years (depending on usage) | --- ### 4. Hardware Installation To install the 2080-MEMBAK-RTC: 1. **Power Down:** Ensure the PLC is powered off to avoid short-circuiting the pins. 2. **Remove Cover:** Take off the protective plastic cover from the Plug-in slot on the PLC face. 3. **Insert:** Align the module and press firmly until seated. 4. **Configure:** Use **Connected Components Workbench (CCW)** software to enable the module in the project settings.