

Allen Bradley 1757-BEM1 Year Warranty
Description
The main function of the 1757-BEM (Battery Extension Module) is to provide battery backup power for volatile memory IC's contained within a module, such as the 1757-PLX52. The battery backup is useful for maintaining information (such as configuration databases) during temporary power outages and weekend shutdowns. The 1757-BEM is a separate, single-wide module that plugs into the ProcessLogix Controller chassis. It incorporates the standard ICP plastic module cover and front door. Connection to the backplane is via the standard ICP connector. The Battery Extension Module ships with one battery un-installed. Three (3) series-connected, sub-C size, nickel-cadmium cells makeup the battery pack. The sourcing capacity is rated at 200mAh. The BEM provides 5 milliamps of DC current at 3.6 volts for a period of 240 hours on a full charge. This rating includes - in addition to actual memory power - any current drawn by the support electronics.
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