Action Element

Introduction

The Actions in a Sequential Function Chart are blocks of code to run when the associated Step Elements are active.

The Action Element has this syntax:

action-element ::= ACTION action-name
code-block
END_ACTION

code-block ::= [ structured-text | instruction-list ]

Where:

action-name is the name of the action in the flow diagram. No two actions in a diagram can use the same name.
code-block is the code to run.
structured-text is any valid Structured Text (ST).
instruction-list is any valid Instruction List (IL).

To run an action, add references from one or more Step Element.

An action to write a tag value:

ACTION StartPump
    (* Start the transfer pump *)
    %"TransferPump" := TRUE;
END_ACTION

IEC 61131-3 Second Edition: Table 42.

IEC 61131-3 Third Edition: Table 56.

For general information about Sequential Function Charts.

For information about IEC 61131-3 scripts.

For the meaning of terms used in Fernhill SCADA.