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Page 360 - ExtendSim User Guide
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Tutorial for Discrete Rate Systems
A basic discrete rate model
Creating a model of the simple yogurt production process
The following table lists the blocks that will be added to the worksheet and their use in the model. Except for the plotter from the Plotter library, the blocks in the table are from the Rate library.
Name (Label)
Tank (Liquid Supply)
Valve (Yogurt Process)
Tank (Yogurt)
Plotter, Discrete Event (Plotter)
Block Function
Acts as a source, intermediate stor- age, or sink for the stuff of the model.
Acts as a constraint on flow. Con- trols, monitors, and transfers the flow at a specified rate.
Acts as a source, intermediate stor- age, or sink for the stuff of the model.
Purpose in Model
Contains an unlimited amount of liq- uids that can be processed into yogurt.
Regulates the flow of liquid at 100 gallons per minute. (A constraint is required; otherwise, the flow would approach infinity!)
Can hold an unlimited amount of processed yogurt.
Reports how many gallons of yogurt per minute are processed (the effec- tive rate) and the total amount of yogurt produced.
☞ Place blocks on the model worksheet using one of the methods discussed in “Adding blocks to the model” on page 26. Or, place the Executive and Tank blocks on the model worksheet and use the “Smart Block” technique to add the remaining blocks. Right click the flow output of the Tank block and select a Valve. Then right-click the flow output of the Valve and choose a Tank, and so forth.
Smart Blocks is only available in discrete event and discrete rate models and the Executive must be on the model worksheet for it to be enabled.
Starting at the right of the Executive block, place the blocks on the model worksheet in a line from left to right, based on their order in the above table.
Label the blocks as indicated in the table.
☞ An easy method for placing blocks on a model worksheet is to access an open library using the
Navigator as discussed in “Library Window mode” on page 793.
Making connections
To indicate the flow of product, connect the blocks’ Flow connectors as follows:
Connect from the outflow connector on the first Tank (labeled Liquid Supply) to the Valve’s inflow connector.
Connect from the Valve’s outflow connector to the second Tank (labeled Yogurt).
Discrete Rate

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