Programmable Logic Controllers_1 10

Programmable Logic Controllers_1 10 - ladder diagrams?...

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Programmable Logic Controllers Lecture Overview • Why PLCs were developed • Functional description of a PLC •I n put/output • Ladder Logic programming concepts
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General Input - Output Symbols in PLC Input Symbols: Output Symbol:
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PLC – General Ladder Diagram put utput Input Output Real-world inputs Physical output connections Conceptual view of a PLC
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Ladder Logic – Continuous Scan
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Ladder Logic – An Example Poor Design – No fault Good Design – fault can indications. be detected. Condition: Normal ondition: Not Normal Condition: Not Normal
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Ladder Logic – An Example What are the rung outputs, in the following ladder diagrams? Ladder diagram exercise.
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Ladder Logic – “AND” Operation A simple drilling machine. Ladder logic – a series, or AND circuit.
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d d L i ND” O ti Ladder Logic – “AND” Operation example. What are the rung outputs, in the following
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Unformatted text preview: ladder diagrams? Ladder Logic – “OR” Operation a house the doorbell should sound if; either the In a house the doorbell should sound if; either the front or rear door button is pushed. Ladder logic – a branching, OR circuit. Ladder Logic – “OR” Operation example What are the rung outputs, in the following ladder diagrams? t i l I t l d D i t i Proportional, Integral and Derivative (PID), Control Proportional gain: control over a wide range, based on magnitude of an error. Integral gain: control small error (offset) over time, based on error multiply by time persisted. Derivative gain: is responsive to rate of i h f t A diagram of a process, controlled by a ID t ll change in error, how fast error changes. Helps damp the overshoot. PID controller....
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Programmable Logic Controllers_1 10 - ladder diagrams?...

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