Programming language for programmable logic controllers
For the lightweight text markup languages, see StructuredText and reStructuredText.
Structured text, abbreviated as ST or STX, is one of the five languages supported by the IEC 61131-3 standard, designed for programmable logic controllers (PLCs).[1][2] It is a high level language that is block structured and syntactically resembles Pascal, on which it is based.[3] All of the languages share IEC61131 Common Elements. The variables and function calls are defined by the common elements so different languages within the IEC 61131-3 standard can be used in the same program.
Complex statements and nested instructions are supported:
Iteration loops (REPEAT-UNTIL; WHILE-DO)
Conditional execution (IF-THEN-ELSE; CASE)[3]
Functions (SQRT(), SIN())
^Bacidore, Mike (16 May 2018). "Should I limit programming to ladder logic or use all standards within IEC 61131?". Control Design.
^Stevic, Tom (5 May 2017). "A very short history of PLC programming platforms". Control Design.
^ abRoos, Nieke. "Programming PLCs using Structured Text". Department of Computing Science, University of Nijmegen. CiteSeerX 10.1.1.49.2016. {{cite journal}}: Cite journal requires |journal= (help)
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