The Allen-Bradley 1756-L74 is a ControlLogix 5570 series programmable automation controller (PAC), positioned as a high-end model in Rockwell Automation's flagship Logix platform. The controller includes a built-in USB programming port, ships with a 1 GB Secure Digital (SD) card for non-volatile storage, and uses a removable Energy Storage Module (ESM) instead of a lithium battery for maintenance-free operation.
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