What can you do with the Free Version of ControlDraw3 ?
A lot - here just a few things you can do. 

Draw Process Flow Diagrams with State Matrices for Unit and Equipment modules and Animate them.

Draw Logic Diagrams and then run them, watching the logic signals flow through the diagram.

Draw Control Loop Function Block diagrams (SAMA Loops)  and run them, simulating processes and their PID control loops.

Draw and simulate Grafcet / SFC Charts, State Transition Diagrams more

Build small Hierarchical S88 oriented models.

Build State Matrices that define the possible states of a collection of objects in one matrix.

There is much more.

To install follow the ControlDraw 2/3 links on the left. 
First Register then Download ControlDraw 3.

This will install the full evaluation version plus the free edition

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Revised: January 12, 2007 .