Learn about Modbus security in industrial automation, including vulnerabilities, fixes, and alternative solutions. There are many pros and cons associated with the integration of security on existing Modbus systems. The primary driver for security introduction is the addition of TCP/IP networking to utilize cloud networking, and this brings with it many potential vulnerabilities. Concern for … Read more
This article will introduce Modbus, an industrial protocol that laid the foundation for fieldbus communication in industrial systems. In 1979, Modicon introduced an application layer protocol (layer 7 of the OSI model) for use with its Programmable Logic Controllers (PLC). This protocol was called Modbus and became the first widely used fieldbus in the history … Read more
What is TLS and what is its role in the Modbus-TCP version of the Modbus protocol? Security comes with added protocol complexity. Many industrial control systems rely upon encapsulating Modbus Application Protocol (MBAP) Protocol Data Unit (PDU) messages carried on a TCP/IP network within a “TLS” layer to secure communications. The combined solution is called ‘Modbus/TCP … Read more
This article provides an introduction to several serial communication methods and how to understand and apply them. Industrial automation systems have always required special communication methods in order to be programmed and to work seamlessly between networked devices. Generations of proprietary and open-source standards have led to a confusing web of related techniques and terms. … Read more
This article includes a list of some common definitions for industrial networking concepts, described in simplified terms to provide a baseline understanding of the concepts. Networking for industrial devices involves many concepts and terms that are uncommon for industrial electrical professionals. Although communication does involve electrical signals, that’s about the end of the list of … Read more