PLC Standard Libraries

Refer to the following pages for an overview of the IEC "International Electrotechnical Commission" IEC is a not-for-profit, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies 61131-3 programming languages:

Program organization units
Data types
Structures
Variables
Arrays
Constant expressions
Conditional compiling
Handling exceptions

SFC: Sequential Function Chart
FBD: Function Block Diagram
FFLD: Free Form 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
• Comparison Operations
• Type conversion functions
• Selectors
• Registers
• Counters
• Timers
• Mathematic operations
• Trigonometric functions
• String operations
• PLC Advanced Libraries
  

Note: Some other functions not documented here are reserved for diagnostics and special operations. Please contact your technical support for further information.