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Structured text
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<p>Structured text, abbreviated as ST or STX, is one of the five languages supported by the <a href="/facts/IEC_61131-3/HgQIo9Ns">IEC 61131-3</a> standard, designed for <a href="/facts/Programmable_logic_controller/bqh0GAdb">programmable logic controllers</a> (PLCs). It is a high level language that is <a href="/facts/Block_(programming)/E6yG3dnJ">block structured</a> and syntactically resembles <a href="/facts/Pascal_(programming_language)/b3yvp8bF">Pascal</a>, on which it is based. All of the languages share <a href="/facts/IEC61131_Common_Elements/HgQIo9Ns">IEC61131 Common Elements</a>. 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. </p><p>Complex statements and nested instructions are supported: </p> <ul><li>Iteration loops (REPEAT-UNTIL; WHILE-DO)</li> <li>Conditional execution (IF-THEN-ELSE; CASE)</li> <li>Functions (SQRT(), SIN())</li></ul>