Allen-Bradley 1756-L81EXTS ControlLogix IO Module

The Allen-Bradley 1756-L81EXTS ControlLogix IO Module is an XT-series I/O module designed for Rockwell Automation’s ControlLogix systems. It installs in a 1756 I/O chassis and interfaces with a ControlLogix controller over the backplane to extend field I/O in industrial automation networks. According to Rockwell’s technical data, this module supports CIP-based I/O with throughput performance up to 128,000 packets per second when CIP Security is not enabled, 40,000 packets per second with integrity, and 20,000 packets per second with integrity and confidentiality. The L81EXTS designation identifies it as part of the L8xEXTS family within the ControlLogix I/O lineup. Typical applications include expanding discrete input/output capabilities on manufacturing lines, packaging systems, and process control environments where fast, reliable data exchange between field devices and the Logix controller is essential. Deploying this module in a ControlLogix rack enables modular I/O expansion and easy integration with Rockwell Studio 5000/RSLogix configuration and monitoring workflows.