IETrig (ITF)

INTERFACE IETrig EXTENDS IActionProvider, IEdgeTriggered

In order to build a function block with an ETrig behaviour, its action provider has to be decorated with this interface. This will determine the state machine which then forces the function block to the appropriate ETrig behaviour.

See Decorators for more information about the concept.

A state chart for function blocks with ETrig behaviour

../../../_images/Edge-Triggered-Function-Blocks_Interfaces_IETrig.png
Starting
⇒ StartAction is running, until xComplete is TRUE, xBusy ⇒ TRUE
At its beginning the SampleAction is probably executed one time.
Executing

⇒ CyclicAction is running until xComplete is TRUE

Cleaning
⇒ CleanupAction is running. At its end the ExitAction is probably executed one time.
After a Ready Condition as input, only the output states
Done (xComplete is TRUE) or Error (eErrorID ≠ ERROR.NO_ERROR) are possible.
After a Error Condition as input, only the output state
Error (eErrorID ≠ ERROR.NO_ERROR) is possible.
Done

xDone ⇒ TRUE, xBusy ⇒ FALSE

Error

xError ⇒ TRUE, eErrorID ≠ ERROR.NO_ERROR, xBusy ⇒ FALSE

Resetting
⇒ ResetAction is running, until xComplete is TRUE.
After that:
- the outputs xDone and xError will be set to FALSE.
- The output eErrorID will be set to ERROR.NO_ERROR.

Methods: