The components of DA and C - Fall 09

The components of DA and C - Fall 09 - MFET 474,...

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MFET 474, Manufacturing Integration II 8/24/2009 The Components of DA & Control 1 MFET 474 Manufacturing Integration II The Components of Data Acquisition and Control 1 T.E. Kostek Fall 2009 Topics • System Block Diagram • The Measurand • The Transducer • Signal Conditioning • Signal Transmission 2 • The DAS • The Computer • The Data Output Module
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MFET 474, Manufacturing Integration II 8/24/2009 The Components of DA & Control 2 System Block Diagram 3 2 1 SC SC "COMPUTER" 6 4 5 ANALOG The following slides examine D W A R E 1 N SC SOFTWARE PERIPHERALS 2 1 2 3 INPUTS slides examine each of the 7 components … 4 M ANALOG OUTPUTS M H A R D W A R E
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MFET 474, Manufacturing Integration II 8/24/2009 The Components of DA & Control 3 The Measurand 5 The Measurand •Th e measurand is the physical quantity that is being measured It is the transducers input being measured. It is the transducers input. • The most common (or core) measurands are: – Position –Force 6 – Motion (velocity/acceleration) – Pressure –F low – Level – Temperature
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MFET 474, Manufacturing Integration II 8/24/2009 The Components of DA & Control 4 The Measurand • A transducers RANGE is determined by the allowable upper and lower limits of the measurand measurand. • Ranges can be classified as follows: Unidirectional Range • Example: A position transducer is used to sense distances 7 ranging from 0 to 50 mm Bi-directional range (symmetrical) • Example: A potentiometer senses ±45 º The Measurand • Range classifications continued: Bi-directional range (asymmetrical) • Example: A temperature transducer senses temperatures from –10 ºF to +90 ºF Expanded (zero suppressed) • Example: An ultrasonic proximity sensor senses distances between 4 and 30 inches 8
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MFET 474, Manufacturing Integration II 8/24/2009 The Components of DA & Control 5 The Measurand •Th e SPAN is the algebraic difference between the two range limits Example 1 : An ultrasonic proximity sensor senses : An ultrasonic proximity sensor senses distances ranging from 4 to 30 inches. • Range = 4 to 30 inches • Span = 26 inches Example 2 : A potentiometer senses angular positions 9 ranging from ±45º • Range = ±45 º • Span = 90º Æ +45 – (-45) The Measurand 10
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MFET 474, Manufacturing Integration II 8/24/2009 The Components of DA & Control 6 The Transducer 11 The Transducer The transducer can be defined as the • The transducer can be defined as the hardware/software that is designed to convert the measurand in one energy system to another (usually more convenient) energy system. 12 • In automated manufacturing systems the final energy system is usually electrical.
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MFET 474, Manufacturing Integration II 8/24/2009 The Components of DA & Control 7 The Transducer •A passive (or self-generating) transducer does not require an excitation voltage (power source).
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The components of DA and C - Fall 09 - MFET 474,...

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