TWO POSITION CONTROL SYSTEMSProcess ControlsTwoPositionControllerA two position controller is a device that has two operating conditions: completely on orcompletely off.Figure 12 shows the input to output, characteristic waveform for a two position controller thatswitches from its "OFF" state to its "ON" state when the measured variable increases above thesetpoint. Conversely, it switches from its "ON" state to its "OFF" state when the measuredvariable decreases below the setpoint. This device provides an output determined by whether theerror signal is above or below the setpoint. The magnitude of the error signal is above or belowthe setpoint. The magnitude of the error signal past that point is of no concern to the controller.Figure 12 Two Position Controller Input/Output RelationshipIC-07 Page 18 Rev. 0
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