The Rockwell AB PLC ControlLogix series 1756-L73 input/output processor module is a high-performance programmable automation controller (PAC) belonging to the Logix 5570 product category, mainly used for controlling large-scale applications or process automation applications in factories. This module has rich input/output capabilities, capable of connecting up to 128000 input and output signals as well as 4000 analog input and output signals, meeting the needs of factory automation systems.

The 1756-L73 processor module can implement local I/O configuration, where the I/O modules are installed in the same chassis as the controller, or in a distributed I/O topology, where extended I/O is installed in a location far away from the processor and provided through an extended communication bus. In addition, it typically includes a processor board with specific processor speed, memory capacity Q, and input/output module slots. Performance features include a high-performance processor that can handle complex control logic and communication tasks.

This module also supports simplex configuration and high availability (redundant) controller configuration to improve system availability. It is usually equipped with Ethernet ports for connecting to industrial networks for data transmission. Overall, the 1756-L73 processor module is designed to meet various factory automation needs, with powerful processing capabilities and flexible configuration options.