WEB PLC simulator for ST programming

In this paper, the main functionalities of a WEB Programmable Logic Controller (PLC) Simulator for programming in Structure Text (ST) language, in the context of industrial automation and control, are presented. The available ST identifiers, expressions and statements are described, and some code examples are given. The simulator provides digital input/output channels, analog input/output channels and also the interaction with a dynamic process model of type autoregressive with exogenous input (ARX). The main contributions are a new environment for teaching, for remote learning, as also one more way to motivate the students and to obtain feedback from them.