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A set point is a value that the computer utilizes to control unit operations of your experiment. A set point is generally a value that is sent to a stamp box that controls the pumps and valves. However, a set point can also be used to change states (discussed in the next tutorial) or other set points can be used in calculating set point values whose signals are sent to pumps and valves.

The first step that you need to do is to add a new set point by clicking "Add Set Point" button. ON and OFF set points are added and set for 1 and 0, respectively. ON (or a value of 1) for a valve means that the valve is completely open, while OFF (or a value of zero) for a valve means that a valve is completely closed. Process control software utilizes fractions between 0 and 1 for processes where you do not want valves to be completely open or closed during a full cycle.

As you can see in the column, other important set points are added, depending on the experiments that are going to be conducted.

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After you have made the pump connection, you want to program into the computer the flow rate speed of the pump into the computer. We can do this through what is known as VI code. Create a new setpoint set point and name the setpoint set point "Mixing Pump Flow Rate." Click on the setpoint set point and reset the type of setpoint set point from constant to variable.

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Ensure that "code match" and "data match" are both green and that the calculated value agrees with the one shown in the figure below.

Exercise

Your next task is to add the following set points to process controller with the values after the comma respectively. Proceed to the next tutorial when you are finished.