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TWO POSITION CONTROL SYSTEMS
Example of Two Position Control

Instrumentation and Control 2 of 2
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TWO POSITION CONTROL SYSTEMS Process Controls Two Position Controller A  two  position  controller  is  a  device  that  has  two  operating  conditions:    completely  on  or completely off. Figure 12 shows the input to output, characteristic waveform for a two position controller that switches from its "OFF" state to its "ON" state when the measured variable increases above the setpoint.    Conversely,  it  switches  from  its  "ON"  state  to  its  "OFF"  state  when  the  measured variable decreases below the setpoint.  This device provides an output determined by whether the error signal is above or below the setpoint.  The magnitude of the error signal is above or below the setpoint.  The magnitude of the error signal past that point is of no concern to the controller. Figure 12    Two Position Controller Input/Output Relationship IC-07 Page 18 Rev. 0







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