LonWorks

LonWorks, short for Local Operating Network, is a networking platform designed for control systems and distributed devices to communicate and coordinate actions. Originating in the 1980s from Echelon Corporation, LonWorks has been developed as an open, interoperable technology through LonMark International and related standards. It is widely used in building automation, industrial process control, and transportation systems.

The core of LonWorks is the LonTalk protocol suite, which enables devices to exchange data via network variables (NVs). Devices can contain a Neuron microprocessor or equivalent and run LonWorks software that maps inputs and outputs to NVs, allowing applications to be composed from interoperable components. Communications can traverse multiple media, including twisted pair (TP1/TP0), power-line, fiber, and Ethernet-based IP-Lon, enabling flexible, multi-network deployments.

Network configuration and management are supported by tools such as LonMaker and LonWorks Network Services (LNS). These tools handle device addressing, binding of network variables, diagnostics, and maintenance. To promote interoperability, LonMark International defines profiles that specify the expected NVs and behavior for device types, helping devices from different manufacturers operate together.

Applications: LonWorks has been employed in commercial and institutional buildings for heating, ventilation, and air conditioning control, lighting, access and security, as well as in industrial automation and transportation subsystems. While some installations continue to operate on LonWorks networks, newer deployments frequently incorporate IP-based or other modern fieldbus technologies, reflecting a diversified automation landscape.