SHKABS.PIA
This sample ISaGRAF project provides a custom function block that can be used to limit the speed of change of a variable.
A typical situation, when such a function is required, is a PIDA function block using a water control valve in the output. While the output of PIDA can generally change very fast, even momentarily, such a control action may cause a hydraulic shock and severe damage of the pipeline. To prevent it, the speed of change of the valve position must be limited.
All ISaGRAF project files associated with this sample program have been archived to a single file with the extension ".pia".
To utlilize this sample program:
- Select the following link:
SHKABS.ZIP
- Select the Open button. (Winzip is opened)
- Select the Use Evaluation Version button. (The Winzip program list is displayed)
- From Winzip, select the sample file in the display list and then extract it to a target folder on your computer.
- Exit Winzip.
- Open the ISaGRAF Projects application.
- Select the Tools | Archive | Projects command.
- Select the Browse button.
- Browse to the target folder specified during the previous download procedure.
- Highlight the sample project name in the Archive list and select the Restore button. (The project is unzipped to the ISaGRAF workbench).
- Select the Close button.
- The sample project name should now appear in the project list.
- Double click on the sample project to open it.
