Page 20 - Continuous Process Modeling Quick Start Guide
P. 20

Continuous Process Quick Start Guide
Once the cursor turns into the double-headed arrow, click and drag down until the desired number of connectors are exposed, as shown here. As you drag, more connectors appear and the number of connectors is displayed.
☞ See the User Reference for more information about variable connectors, including how to collapse them.
Connector function
To get information about a connector’s function, click the Help button in the bottom left-hand corner of the block’s dialog or see the User Reference.
☞ Place your cursor over a connector to see its name and current value; that value will change as the model runs. You may also see additional information depending on how the block is pro- grammed.
The connections between blocks represent the flow of information. The simulation itself is a series of calculations and actions. In continuous process models, each calculation is called a step.
☞ In the Reservoir model, the blocks calculate in an order determined by the connections, starting at the left and going to the right.
Making connections
There are three ways to make physical or logical connections between blocks:
1) Lineconnectionsphysicallyjointheoutputofoneblocktotheinputofanother.usingcon- nection lines
• The Point and Click method is often used to physically draw a connection line between one block’s output connector and another block’s input connector (or vice versa).
• When an ExtendSim block’s connector is right-clicked, a spe-
cial Smart Block technique can be used to add a block to the
model and at the same time automatically connect it to the original block with a con- nection line.
2) Namedconnectionsusetextlabelsasoutputsandinputs,causing data to jump from the output to the input without using connection lines. In the Reservoir 1 model shown on page 13, the values for Rainfall and Stream are transmitted using named connections.
3) TheThrow/Catchfeatureallowsremoteconnections,evenbetweenhierarchicallevels;this is discussed in the User Reference.
Libraries are repositories for the blocks used to build models. When you open an existing model, ExtendSim automatically opens the libraries that contain the blocks used in the model. Libraries are also automatically opened if listed in the table in the Edit > Options > Libraries tab.
Libraries can be manually opened, closed, and created in the Library menu. Open libraries are listed in alphabetical order at the bottom of the Library menu.

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