figure 11.1 circuit for example 11.1. curtis johnson process control instrumentation technology, 8e]...

FIGURE 11.1 Circuit for Example 11.1.

Curtis JohnsonProcess Control Instrumentation Technology, 8e]

Copyright ©2006 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458

All rights reserved.

FIGURE 11.2 Holding tank level-control system for Example 11.2.




FIGURE 11.3 A logic gate solution for Example 11.2.




FIGURE 11.4 Comparators and a flip-flop can be used to make a digital two-position controller.




FIGURE 11.5 Solution for Example 11.3.




FIGURE 11.6 Basic structure of a microprocessor-based computer.




FIGURE 11.7 Smart sensors encase the computer-based controller with the sensor.




FIGURE 11.8 One computer can control several loops.




FIGURE 11.9 Flowchart for proportional mode.




FIGURE 11.10 Finding the integral by the rectangular integration algorithm.




FIGURE 11.11 Flowchart for the integral mode using rectangular integration.




FIGURE 11.12 Approximate calculation of the derivative from sampled data.




FIGURE 11.13 Flowchart of the derivative mode.




FIGURE 11.14 General features of a data-logging system using a computer.




FIGURE 11.15 In computer supervisory control, the computer monitors measurements and outputs the loop setpoints.




FIGURE 11.16 Computer supervisory control is ideally suited to strongly interacting control problems.




FIGURE 11.17 Flowchart symbols and an example of setpoint changes in a supervisory control system.




FIGURE 11.18 Flowchart solution of Example 11.5.




FIGURE 11.19 A myriad of wires and pipes connect the control room to the plant.




FIGURE 11.20 Networks can be wired into various configurations such as stars, rings, and a bus.




FIGURE 11.21 Using a bus eliminates the multitude of wires and pipes.




FIGURE 11.22 Unique addresses allow computers and devices to share the bus.




FIGURE 11.23 The OSI 7-layer communication protocol showing packet encapsulation by each layer.




FIGURE 11.24 A fieldbus can use digitally modulated current for transmission and power.




FIGURE 11.25 Process system for Example 11.12.




FIGURE 11.26 Flowchart solution for Example 11.12.




FIGURE 11.27 Process used in the problems.




FIGURE 11.28 Temperature-control system for Problem S11.1.




FIGURE 11.29 Thermistor characteristic for Problem S11.1.




figure 11.1 circuit for example 11.1. curtis johnson process control instrumentation technology, 8e]...

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