communication protocol

All About PLCs: Networking and Communications

Learn about the modules and systems that provide a network connection to the outside world, transforming traditional PLCs into true, modern process automation controllers (PAC). The name PLC is going to stick around for a very long time. No matter what capabilities are contained inside an industrial controller, whether that includes I/O, networking, or even … Read more

The TLS (Transport Layer Security) Protocol in Secure Modbus/TCP

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