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STEP 7 Basic V10.5

Getting Started, 12/2009, A5E02651459-01

Extended example

3.1 Introduction

Loading a project

If you have skipped the previous chapter, you can load the project status at the end of the

chapter (see "Loading a project (Page 17)"). The project status at the end of this chapter is

stored in the "Simple_E

xample.ZIP" file.

Overview

In the second part of the example project you create an additional program that controls a

simple station for pasteurizing milk. The station consists of a conveyor and a heating

chamber.

The conveyor drive is controlled by the three light barriers:

● The first light barrier (LS1) is activated when a milk bottle stands at the start of the

conveyor. The conveyor drive is switched on and the bottle is moved into the heating

chamber.

● The second light barrier (LS2) detects the position of a milk bottle in the heating chamber.

It signals that the conveyor has to be stopped and for the heating to be switched on in the

chamber.

In the heating chamber the bottles are heated for 40 seconds at a temperature of 75° C.

A status light stays illuminated as long as the heating is on. When the heating process is

complete, the conveyor drive is restarted and the bottle is transported to the end of the

conveyor.

● When a bottle reaches the end of the conveyor a third light barrier (LS3) is activated and

the conveyor stops. The bottle can then be collected by the next station.

The switching on and off of the complete station is controlled by the button that was

programmed in the first part of the project.

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