Major Parts of Sequential Function Chart
Major parts of the sequential function chart
A function chart refers to a series of graphical programming language used in
programmable logic control (PLC) to initiate and execute a specific function or event. The
function chart is one of the ICE 61131-3 PLC programming language with its basics of operation
detailed in the IEC 848 standards (Simon & Kowalewski, 2016). The function chart involves the
execution of activities in sequential order, and the task execution occurs in three major stages or
parts, that are the sequential operation step, the transition stage, and the final step of actualization
or action stage.
The first part of the function chart is the initiation step. This stage is graphically
represented by the use of a double- line rectangle. In logic programming, the rectangle indicates
the first action in ladder logic with operation descriptions indicated on the left side of the
rectangle box. The flow of operations in function chart, not unless indicated or stated otherwise,
is assumed to be flowing from top to down (Mohamed & Karim, 2016). Actions associated with
each step can either be active or inactive depending on the logic instruction; therefore, this stage
that describes the related action will only activate the second stage if the set logic instructions
activate it
The second part is the transition condition. In a programming language, this is often
represented by horizontal lines and bars between steps, and this stage controls the operations of
steps in that if the instructions in the active phase is correct then the stage is deactivated and the
preceding step is activated, and the sequential operations flows up to the end of the flow
diagram. Step execution stops at the end of the flow chart, where it is signalized by the presence

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