Standardised PLC Functionality
The IEC not only standardises the syntax of programming languages, but even goes a step further to unify the implementation of typical PLC functions, such as timers, counters or special arithmetic operations.
The standard does this by defining typical PLC functions and function blocks and describing their behaviour exactly. These elements are known as standard functions and standard function blocks respectively. Their names are reserved keywords.
KeywordsData Type Edge Detection Programming System Standard Function Structure Text
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