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Getting Started Guide Tutorial 2 - Modifying the Control Scheme • 2-11
4. Move the mouse pointer over stream 3 and release the mouse
button on the port marked OutputSignal.
The Select the Control Variable dialog box for stream 3, the
liquid distillate stream, appears.
5. Click STREAMS("3").Zn("MCH") to select the liquid mole
fraction of MCH in the liquid distillate, then click OK.
In the Process Flowsheet window, the cursor becomes an arrow
connected to a solid black line.
6. On the MCHCOMPDT dead-time block, click the port
marked InputSignal.
Because there is only one input variable to connect to, the
control signal (blue broken lines) is automatically connected
to the dead-time block.
7. In the Contents pane of the Simulation Explorer, click and
hold down the mouse button on the Control Signal icon again
and drag it to the Process Flowsheet window.
8. Release the mouse button on the port marked OutputSignal of
the MCHCOMPDT dead-time block.
A control signal is automatically created and is ready to be
connected to a port.
2-12 • Tutorial 2 - Modifying the Control Scheme Getting Started Guide
9. On the MCHCOMP block, click the port marked InputSignal
to connect the control signal.
The Select the Control Variable dialog box appears:
10. In the Select the Control Variable dialog box that appears,
click MCHCOMP.PV then click OK to connect the control
signal.
Your Process Flowsheet now looks like this:
Getting Started Guide Tutorial 2 - Modifying the Control Scheme • 2-13
To specify the manipulated variable:
1. Ensure Stream Types is still selected in the Simulation
Explorer.
2. In the Contents pane of the Simulation Explorer, click and
hold down the mouse button on the ControlSignal icon.
3. Drag it onto the Process Flowsheet to the port marked
OutputSignal on the MCHCOMP block.
A control signal (black line with a cursor) is automatically
created and is ready to be connected to a port.
4. Move the pointer to stream 2 and click the InputSignal port.
The Select the Control Variable dialog box appears:
5. To select the phenol component mole flow of stream 2, click
the variable.STREAMS("2").FcR ("PHENOL").
6. Click OK to connect the controller output signal to the
manipulated variable.
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