What does action and reaction mean?
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I would appreciate it if an expert could give some guidance: In the HEP-16 positioner, does the knob for adjusting the travel move upward or downward – is it in a forward or reverse direction? What is the relationship between the forward and reverse action of a positioner and those of a control valve in a DCS? ? How is the positive and negative feedback in cascade control adjusted, and what is their function?
Direct-acting valve positioner: As the input signal increases, the output signal also increases； Reaction valve positioner: input increases, output decreases.
For regulators, positioners, etc., in simple terms, when the input increases, the output also increases – this is positive action; otherwise, it is negative action...
What was said on the second floor is correct. Don’t you know Baidu? Are you just trying to gain experience? Actually, I’m the same, hahaha