FFXI Haven - Ваш Источник #1.

An open loop controller will set a desired position for a system, but no sensors are used to verify the position. When a system must be constantly monitored and the control output adjusted we say it is closed loop. A cruise control in a car is an excellent example. This will monitor the actual speed of a car, and adjust the speed to meet a set target speed.

Many control technologies are available for control. Early control systems relied upon mechanisms and electronics to build controlled. Most modern controllers use a com

plc wiring -1.3

puter to achieve control. The most flexible of these controllers is the PLC (Programmable Logic Controller).

Purpose

* Most education focuses on continuous control systems.
* In practice most contemporary control systems make use of computers.
* Computer based control is inherently different than continuous systems.
* The purpose of this book is to address discrete control systems using common control systems.
* The objective is to prepare the reader to implement a control system from beginning to end, including planning and design of hardware and software.

Audience Background

• The intended reader should have a basic background in technology or engineering.

A first course in electric circuits, including AC/DC circuits is useful for the reader, more advanced topics will be explained as necessary.

Editorial notes and aids

Sections labeled Aside: are for topics that would be of interest to one discipline, such as electrical or mechanical.

BACK | NEXT

Easy Access To All Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140