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In this week of Industrial Automated Systems we discuss process  controls that utilize variables and controlled set-points. The following  topics are part of this system:

On-Off Control mode is as the name implies in that the process  control is automated to turn a system on and off. This is dependent on  input variables and does not have a mechanism to account for lag. On-Off  control is not able to have an intermediate setpoint.

Proportional mode process ensures that the input values will have an  output of a magnitude that is proportional to that of what the error  variable is determined. What this means is that if an error is small the  output would be proportional to the magnitude of that size based on a  predetermined scale.

Proportional-Integral mode combines the benefits of proportional mode  along with a reset ability. Integral refers to the reset and the action  can also add to a controllers output from previous actions taken place.

Proportional-Integral-derivative mode must function alongside or in  combination with integral or / and derivative. The derivative mode  allows for rapid load and large changes in slow response systems. This  mode allows faster response than proportional, though the rate setting  is low.

Bartelt, T. L.  (20110407). Industrial Automated Systems:  Instrumentation and Motion Control. [[VitalSource Bookshelf version]].   Retrieved from vbk://9781305474277

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