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1756 Energy Storage Modules
Energy storage modules apply to only ControlLogix 5570 controllers.
1756-ESMNSE
ESM without Wall Clock Time back-up power. Additionally, you can use this ESM only with a 1756-L73 (8 MB) or smaller memory-sized controller. For use in hazardous areas.
1756-ESMNRM
ESM that secures the controller by permanently preventing the USB connection and SD card use. This ESM provides your application an enhanced degree of security.