Reverse output signal
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What is the function of the reverse output signal? I look at the logic diagram. This is a pair.
Example: The status of the motor uses a red light to indicate stop, and a green light to indicate running. This requires a pair of inverted outputs to drive
I guess what is mentioned above is that the 4-20mA signal is output and becomes a 20-4mA signal. This situation is generally used in split-range control. In order to determine that one of the loops is negative feedback, the positive and negative effects of the regulator are also determined. For the other loop, the air opening or air closing of the regulating valve is also certain. This is a measure taken to achieve negative feedback.