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ParkingCounter.md

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Example library for TIAX use case

Description

This sample library contains suitable functionalities for determining the parking space occupancy of a car park.

CarPark

Software blocks

Counter

Generic Counter class for counting upwards and downwards.

ParkingCounter

Class ParkingCounter counts the filling level of the car park depending on the above described sensor signal sequence.

This class has two input sensors:

  • BSensorInside
  • BSensorOutside

Depending in which order the signals are occupied, the counter-value will be incremented or decremented.

Example for entering the car park: First will the SensorOutside occupied and then SensorInside. In this case, the counter will be increased by one.

ParkingCounterFB

TIA Portal compatible ParkingCounterFB which acts as wrapper function block. It uses internally the class ParkingCounter

Maybe a link what a wrapper FB is ? How does a wrapper work? Also link to explanation

Create Global Library for the TrafficLightWrapper

Now our traffic light is complete and can be imported in a TIA Portal global library --> How to crate a global library

Use TrafficLightWrapper in TIA Portal

  1. Open a TIA Portal project, which contains any 1500 PLC

  2. Open the TIAPortalGlobalLibrary

    open lib

  3. Select the function block ParkingCounterWrapper

    TIA

  4. Instantiate the ParkingCounterWrapper in e.g. the Main OB

Used features in this application example

ST features

  • Namespaces
  • Enumeration
  • Class & Methods
  • Call of private methods (THIS-Operator)
  • Definition and implementation of interfaces (INTERFACE/IMPLEMENTS)
  • Access modifier (PRIVATE/PUBLIC)

UnitTesting

  • Test fixture
  • Test method
  • Assertions