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1771 Series I/O Chassis Overview

The Allen-Bradley 1771 Series Chassis is the core framework of the PLC-5 Series scalable I/O system, used to mount and interconnect PLC controllers with various input/output modules (such as digital inputs, digital outputs, analog inputs/outputs, and special function modules). The chassis provides reliable electrical connections, mechanical support, and backplane communication between modules, enabling stable and efficient operation of the entire I/O system.

The chassis is typically divided into multiple slots, each accommodating a single I/O module. The controller directly accesses the registers of each module via the backplane, enabling real-time monitoring and control of industrial equipment. The 1771 Series Chassis supports various sizes and configurations to accommodate automation systems of different scales.

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