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The company was founded in 1994 under the name 3S-Smart Software Solutions. It was renamed in 2018 and 2020 to Codesys Group / Codesys GmbH. Version 1.0 of CODESYS was released in 1994. Licenses of the CODESYS Development System are free of charge and can be installed legally without copy protection on further workstations.
Part 3 of IEC 61131 deals with basic software architecture and programming languages of the control program within PLC. It defines three graphical and two textual programming language standards: Ladder diagram (LD), graphical; Function block diagram (FBD), graphical; Structured text (ST), textual
Ladder notation is best suited to control problems where only binary variables are required and where interlocking and sequencing of binary is the primary control problem. Like all parallel programming languages , the sequential order of operations may be undefined or obscure; logic race conditions are possible which may produce unexpected results.
A programmable logic controller (PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.
It is also possible to insert LD (Ladder Diagram) actions inside an SFC program (and this is the standard way, for instance, to work on integer variables). SFC is an inherently parallel programming language in that multiple control flows — Program Organization Units (POUs) in the standard's parlance — can be active at once.
The Triconex main processors can communicate with the so-called TriStation 1131 application software to download, update and/or monitor programs. [3] These programs are either written in: Function Block Diagram language, Ladder diagram language, or; Structured text (Pascal like) Language. Cause and Effect Matrix Programmable Language (CEMPLE).