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IEC 61131
The IEC 61131 Standard was developed
with the input of vendors, end-users and academics,
IEC 1131 consists of
five main parts:
- General information
- Equipment and test requirements
- PLC programming languages
- User guidelines
- Communications
The third part IEC 61131-3 is the international standard for programmable
controller programming languages. This standard for programmable controller
languages specifies the syntax, semantics and display of the PLC programming
languages:
- Ladder
diagram (LD)
- Sequential
Function Charts (SFC)
- Function
Block Diagram (FBD)
- Structured
Text (ST)
- Instruction
List (IL)
One of the primary benefits of the standard is that it allows multiple languages
to be used within the same programmable controller. This allows the program
developer to select the language best suited to each particular task. Via
decomposition into logical elements, modularization and modern software
techniques, each program is structured, increasing its re-usability, reducing
errors and increasing programming and user efficiency .
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