Modelica.StateGraph.Examples

Information

Package Content

Name	Description
FirstExample	A first simple StateGraph example
FirstExample_Variant2	A variant of the first simple StateGraph example
FirstExample_Variant3	A variant of the first simple StateGraph example
ExecutionPaths	Example to demonstrate parallel and alternative execution paths
ShowCompositeStep	Example to demonstrate parallel activities described by a StateGraph
ShowExceptions	Example to demonstrate how a hierarchically structured StateGraph can suspend and resume actions on different levels
ControlledTanks	Demonstrating the controller of a tank filling/emptying system
Utilities	Utility components for the examples

Modelica.StateGraph.Examples.FirstExample

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Modelica.StateGraph.Examples.FirstExample_Variant2

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Modelica.StateGraph.Examples.FirstExample_Variant3

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Modelica.StateGraph.Examples.ExecutionPaths

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This is an example to demonstrate in which way parallel activities can be modelled by a StateGraph. When transition1 fires (after 1 second), two branches are executed in parallel. After 6 seconds the two branches are synchronized in order to arrive at step6.

Before simulating the model, try to figure out whether which branch of the alternative sequence is executed. Note, that alternatives have priorities according to the port index (alternative.split[1] has a higher priority to fire as alternative.split[2]).

Modelica.StateGraph.Examples.ShowCompositeStep

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This is the same example as "ExecutionPaths". The only difference is that the alternative paths are included in a "CompositeStep".

Modelica.StateGraph.Examples.ShowExceptions

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CompositeStep "compositeStep" is a hierarchical StateGraph consisting of two other subgraphs. Whenever component "compositeStep" is suspended, all steps with in "compositeStep" are deactivated. By entering "compositeStep" via its "resume" port, all steps within "compositeStep" are activated according to their setting before leaving the "compositeStep" via its "suspend" port.

Modelica.StateGraph.Examples.ControlledTanks

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With this example the controller of a tank filling/emptying system is demonstrated. This example is from Dressler (2004), see Literature. The basic operation is to fill and empty the two tanks:

1. Valve 1 is opened and tank 1 is filled.
2. When tank 1 reaches its fill level limit, valve 1 is closed.
3. After a waiting time, valve 2 is opened and the fluid flows from tank 1 into tank 2.
4. When tank 1 is empty, valve 2 is closed.
5. After a waiting time, valve 3 is opened and the fluid flows out of tank 2
6. When tank 3 is empty, valve 3 is closed

The above "normal" process can be influenced by three buttons:

• Button start starts the above process. When this button is pressed after a "stop" or "shut" operation, the process operation continues.
• Button stop stops the above process by closing all valves. Then, the controller waits for further input (either "start" or "shut" operation).
• Button shut is used to shutdown the process, by emptying at once both tanks. When this is achieved, the process goes back to its start configuration. Clicking on "start", restarts the process.