6.4 Types of Programming Language
GM Programmer supports five programming languages that comply with IEC 61
131-3, the
international standard for PLC programming languages.
● Continuous Function Chart (CFC) and Page-Oriented CFC are not included in the five
programming languages compliant with IEC 61
131-3. However, the third edition of IEC 61131-3
defines them as object-oriented programming languages.
■
Ladder Diagram program (LD program)
Ladder Diagram is a graphical programming language used to create a program by arranging
ladder logic elements such as contacts and coils on a network (circuit). It also allows the use of
functions and function blocks with various functions.
■
Structured Text program (ST program)
Structured Text is a programming language that creates expressions, conditional statements,
and other program elements in text format. It is based on the Pascal programming language
and suitable for numerical calculation, data processing, and processing such as conditional
branch and repetitive processing.
■
Sequential Function Chart program (SFC program)
Sequential Function Chart is a graphical programming language used to create a program by
arranging steps, transitions, actions, and other elements sequentially from top to bottom. It is
suitable for processing that describes state transitions.
6.4 Types of Programming Language
WUME-GM1RTXOP-01 6-15
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