W09-3 Ch09-DiscreteCntrl_PLCTheory.pdf

W09-3 Ch09-DiscreteCntrl_PLCTheory.pdf - INEN5396...

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INEN5396 1 Discrete Process Control and PLC Theory MECT 3360 Weihang Zhu Department of Engineering Technology University of Houston 2 Outline (Discrete Control) Sequential Vs. Logic Control system Industrial Logic Control System Control Devices Difficulty of Using Computer as a Controller PLC and PLC functions 3 Outline (PLC) Basic Components of PLC Basic Controller Hardware Processor/ CPU Memory Module Power Supply Rack I/O Modules (Peripheral interface adapters) Programming Hardware Benefits of PLC Switches, Relays, Counters, Timers Binary sensors and actuators Switching theory 4 Process Data for Input/ Output Sensors Actuators Digital Analog Analog Input Control Input (binary) Pulse Counters (non-binary) Analog Output Control Output (binary) Pulse Generators (non-binary) Computer Process Control Industrial Process Analog to Digital Converter Digital to Analog Converter Monitoring Analysis Control Routine 5 Manufacturing Control Manufacturing Control Sequential Continuous (Process) Control Discrete Control Logic Discrete Process Control Control systems that operate on parameters and variables that change at discrete moments in time Parameters and variables are discrete, usually binary (0 or 1, off or on, open or closed, etc.) Sensors Limit switch Contact/no contact Photo-detector On/off Timer On/off Actuators Motor On/off Valve Open/closed Clutch Engaged/not engaged 6
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