Action and reaction
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As a workshop operator, my understanding of positive and negative actions is limited to adjusting the air supply and cutoff of control valves; could someone give me a more detailed explanation?
The reply upstairs is very comprehensive; I’ve learned something from it
Don’t listen to those copied-and-pasted things. Talking about strategies on paper is of no use. They are all smart locators these days. So the positive and negative reactions at the valve no longer exist, and there is no need to remember them anymore. The action and reaction being discussed here refer to the loop control on the DCS side. There’s no need to remember this either. If you think that the valve isn’t moving in the direction you want when using automatic mode, just adjust the reaction force.
The workshop operator knows that 0 to 100 refers to turning it on or off; by \"turning the wind on\" it means using wind to open the valve
Wind on/wind off refers to the mode of operation, while there are also fault types such as fault on and fault off. As for forward action and reverse action, these determine the mode of operation of the controller when automatic mode is selected