PLC programming, tutorial, training, hints and tips.

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 »

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.

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

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.

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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 »