Step 6: Implementation
Switches
For the implementation of the functionality of the module Switch we use the method CallPrioMediumStart from Module by overriding it with our own implementation. We choose this function, because the module Room declared a MEDIUM task, which implies that the method CallPrioMediumStart of the function block Switch will be called each cycle of a medium task. The detailed information can be seen in example project itself. However, the main functionality of the switch is to differ between the tap and dim function. After pushing the switch, a timer will start with the given time from the user parameter. When the timer is finished and the switch not released the dim function is used, indicated by the variable xPushLong. The variable xPush is TRUE, if the switch is just tapped. For both xPushLong and xPush properties are added to both the function block Switch and the interface ISwitch, so that they can be used from the parent light function block.
Light
Again, the Light function block overrides the method CallPrioMediumStart. Depending on the input variables of the underlying switch, the light is dimmed to "on" or "off" or only toggled. For the dimmer, the speed value of the declared parameter rSpeed is used. After reaching the maximum or minimum dim value, the dimming is stopped. If the light is in a dimmed state and the switch is tapped, the light is switched on. (The detailed implementation is given in the corresponding example project.)
Check the code
After implementation, the declarations should be checked by use of the command Build. If no error is displayed the declarations is alright.