Discrete-state Process Control

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Presentation transcript:

Discrete-state Process Control Lecture 1 Discrete-state Process Control

Learning Outcome Identify a discrete-state process control system and characterize it. Design a simple relay-based discrete-state control system and document it using the proper circuit diagram. Appreciate Programmable Logic Controllers as universal discrete-state process controllers in industrial applications

Textbook reading Page 387 – 396 Page 403 – 405 Section 8.4

Process Control Controller Set Point Feedback Output

What is Discrete-State Control? not continuous control on / off control can be sequential control More advances timer / counter

Discrete Control The controller only provide ON / OFF control Discrete Input – ON / OFF state such as push button, switch, floating switch, proximity switch, optical switch, etc. Controller – Switch, Relay, Contactor

What is the different between Relay and contactor? operates as the heart of the relay ladder control operates at low voltage and low current, e.g. 12V and 24V d.c. 1P1T to 4P8T Contactor operates at power voltage, e.g. 220V / 380V Contacts carry the load current such as motor current With auxiliary contacts for the relay ladder (low voltage and low current) Main contacts – 2P1T to 4P1T

What is a relay controller? What is an electronic controller? What is a PLC?

Activity Design a Star-Delta Starter for a 3-phase 380V 10kW induction motor Draw the power circuit and control circuit separately