Discuss several processes of automatic control

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Let’s discuss a few processes of automatic control Step 1: Sensors (such as pulse generators, pressure sensors, level sensors, etc.) convert physical quantities into standard electrical signals that can be recognized by the data acquisition module. There are two types of such signals: A. DI (Digital Input) signals, which can be either on/off signals or level signals ； B. AI (Analog Input) signals, including 4-20mA, 0-5V, 0-10V, 0-24V, etc. Step 2: The data acquisition module, along with the software provided by the manufacturer that complies with certain protocols, converts the aforementioned signals into digital variables that can be recognized and processed by the computer control system. Step 3: The configuration software processes these variables to enable functions such as real-time and historical display, report printing, recording, and control output. Step 4: If there are control tasks, the configuration software outputs digital values (0 or 1) to the DO (Digital Output) module, or it outputs analog values (4-20, 0-10, 0-5, etc.) to the AO (Analog Output) module. Step 5: The signal output from the DO module, after being amplified, can drive the actuator(s) (such as motor switches, solenoid valves, solid-state relays, etc.) to carry out the control task ； The signals output from the AO module include 4-20mA current, 0-10V DC voltage, 0-5V DC voltage, etc. These signals are sent to actuators such as pneumatic-electric converters, electric control valves, solid-state power regulators, etc., to carry out the corresponding control tasks. This post was last edited by Mobei Yihai on 2009-3-22 at 12:56.]