Properties
About
Displays the about dialog box for the Proportional-Integral-Derivative (PID) control.
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Action
Changes the current operating mode of the PID control:
0-Stop
1-Run
2-Reset.
Reset causes all values stored in the
controller to be reset to their controller startup
settings. The control must be in the RUN mode to perform
calculations internally.
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BackColor
Sets the background color of the control.
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Gain
Sets The sensitivity of the controller. This value is
multiplied times the difference between the setpoint and measured value, then divided
by difference between the maximum and Minimum control values (the range of the
controller). The value is expressed as a percentage, so 100 will cause a 50%
output when the difference between measured value and setpoint is 1 half of the
span of the controller (100 degrees).
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Measured
Position of the measured value arrow. The maximum value for this property
is determined by the setting of the SPMax property. The minimum value is
determined by the SPMin property. You usually set this value by periodically
getting a measured value from a hardware I/O controller, converting the value
to the range of the controller (as determined by the SPMin and SPMax properties),
and then setting this property.
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Mode
Manual(0) or Automatic(1). If set to automatic, the controller calculates and
sets the output value based on the measured value and setpoint. If set to manual,
the controller does not adjust the output, but allows you to set it manually.
Setting the mode to manual also allows you to write your own algorithms for
controlling the output based on the measured value and setpoint.
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MVColor
Color of the measured value arrow.
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MVTickColor
The color of the tick marks for the measured value.
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OPColor
Color of the output arrow.
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OPMode
Normal or Reverse. In reverse mode the output is set to 100% when the measured
value is greater than the setpoint. In normal mode, the output is zero when the
measured value is over the setpoint. This is useful for controlled devices that
work in opposite fashions. For example, some pneumatic valves are closed at 100%
output and wide open at 0% output. Other valves are the opposite of this.
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OPTickColor
Color of the tick marks on the output scale.
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Output
The current output value of the controller. This value is calculated and then updated by the controller based on
the control settings when the Mode property is set to Automatic. Although you can set the Output property when the
controller is running, it will be overridden by the controller when it performs its next update.
If the Mode property is set to Manual, then you can set the Output property to whatever you want and the controller
will not change it. The range
of values is 0 - 100%. You can specify a decimal value.
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Poll
Controller update period (in milliseconds). This value should be set to something reasonable
(1000 milliseconds = 1 second). Setting it too low will cause the control to take a large amount of CPU time.
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Preact
This value determines how many minutes the controller "looks ahead" to determine how the output should
be adjusted. The calculation is done by extrapolating from the previous measured value to determine
what the value will be at the specified lead time. This setting affects the ability of the controller
to respond ahead of time to rapid changes in the measured value.
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Reset
The number of times per minute that the normal output calculated based on the Gain is reapplied to the
output. This setting affects the ability of the controller to correct for a continuous offset between
the setpoint and measured value.
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Setpoint
Current setpoint position. This must be a value between or including the current minimum
and maximum values of the controller.
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SPColor
Color of the setpoint arrow.
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SPMax
Maximum value for the setpoint.
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SPMin
Minimum value for the setpoint.
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SPTickColor
Color of the setpoint tick marks.
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