Closed Loop and PID Control

March 18th, 2007

Introduction

One of the greatest strengths of using a programmable machine control, such as a PLC, is in its capability to adapt to changing conditions. When properly designed and programmed, a machine control system is able to sense that a machine is not operating at the desired or optimum conditions and can automatically make adjustments to the machine’s operating parameters so that the desired performance is maintained, even when the surrounding conditions are less than ideal. In this chapter we will discuss various methods of controlling a closed loop system and the advantages and disadvantages of each.

Simple Closed Loop Systems Read the rest of this entry »

PLC Automation Trainer

March 17th, 2007

this program compares some types normally PLC. My perpose is help someone who work in a plan and he hasn’t time to research. So he can change this program from this type PLC to another type.

PLC Automation Trainer

ladder simulation

March 17th, 2007

ladder simulation is Pretty cool ladder simulator program for beginners from bytronic

ladder simulation

Omron PLC cable layouts

March 17th, 2007

The PLC’s from Omron can be connected to various peripheral equipment. Each device requires its own cable layout. Only the more common cables are shown here.

db9 male

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Motor Controls

March 17th, 2007

Introduction

 Since most heavy machinery is mechanically powered by electric motors, the system designer must be familiar with techniques for controlling electric motors. Motor controls cover a broad range from simple on-off motor starters to sophisticated phase angle controlled dc motor controls and variable frequency ac motor drive systems. In this chapter we will investigate some of the more common and popular ways of controlling motors. Since most heavy machinery requires large horsepower ac motors, and since large single phase motors are not economical, our coverage of ac motor controls will be restricted to 3-phase systems only.   Read the rest of this entry »

Advanced Programming Techniques

March 17th, 2007

Introduction

 In addition to the standard logical operations that a PLC can perform, seasoned PLC programmers are aware that, by taking advantages of some of the unique features and characteristics of a PLC, some very powerful operations can be performed. Some of these are operations that would be very difficult to realize in hardwired relay logic, but are relatively simple in PLC ladder programs. Many of the program segments in this chapter are rather “cookbook” by nature. The student should not concentrate on memorizing these programs, but instead, learn how they work and how they can be best applied to solve programming problems.

  Read the rest of this entry »

The Programmable Logic Controller

March 17th, 2007

Introduction

A physical description of the various configurations of programmable logic controllers, the functions associated with the different components, will follow. The chapter will end with a discussion of the unique way that a programmable logic controller obtains input data, process it, and produces output data, including a short introduction to ladder logic.

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