American Industrial Supply Co. gives industrial automation buyers and sellers a place to explore used PLC Ethernet and communication components by category and manufacturer. Browse options from Allen-Bradley, AutomationDirect, ALLEN BRADLEY, and AB, then contact the company to discuss purchasing or selling equipment. This focused selection helps connect businesses with components suited to their automation needs.
These components connect programmable logic controllers (PLCs) with operator interfaces, computers, remote I/O, drives, sensors, and other control-system devices. Common options include Ethernet communication modules, network interface modules, communication processors, serial gateways, and industrial switches. Depending on the system, they may support protocols such as EtherNet/IP, Modbus TCP, or PROFINET, enabling data exchange for machine control, production monitoring, and coordination across factory networks.
The cost of used PLC Ethernet and communication equipment varies according to brand, model, compatibility, features, availability, and market demand. Older or less common components may be priced differently from widely used modules, while protocol support and network requirements can also affect value. Before choosing a part, confirm its fit with the PLC platform, software, communication protocol, and existing network architecture.
PLCs emerged in the late 1960s as a flexible alternative to relay-based machine control. Early systems relied largely on local connections and manufacturer-specific communication methods; serial links later supported data exchange between controllers and peripherals. As industrial networks developed, Ethernet-based communication and protocols such as EtherNet/IP and Modbus TCP made it easier to connect PLCs with supervisory systems and distributed equipment. Today, communication modules help integrate established control systems with increasingly connected production environments.
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