Refer to the following pages for an overview of the IEC61131-3 programming languages:

Program organization units
Data types
Variables
Arrays
Constant expressions
Conditional compiling
Handling exceptions
Variable status bits
UNICODE strings (WSTRING)

SFC: Sequential Function Chart
FBD: Function Block Diagram
LD: Ladder Diagram
ST: Structured Text
IL: Instruction List
Use of ST instructions in graphic languages

The following topics detail the set of programming features and standard blocks:

Basic operations
Boolean operations
Arithmetic operations
Comparisons
Type conversion functions
Selectors
Registers
Counters
Timers
Maths
Trigonometrics
String operations
Advanced

Function blocks, used for specific driveres can be found in the Driver specific function blocks area.

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