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Siemens Logo Soft Comfort Practical

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1. PRACTICAL AIM The aim of this practical is to work with the SiemensLOGO!Soft Comfort program to gain knowledge and practical experience in the field of PLC’s. This practical is aimed to widen out understanding of PLC’s and the programming behind it to make a simple device work according to spesifications. The SiemensLOGO!Soft Comfort package will be used to design a solar powered ultra-capacitor streetlight, and then programming it to work according spesifications. 2. BACKGROUND INFORMATION 2.1 WHAT IS A PLC? PLC stands for programmable logical controller. A PLC is a device that can be programmed to control many different kinds of equipment in the industry. A PLC automates processes to make manufacturing and many other things easier. A PLC is used in systems by connecting switches with …show more content…

Below is a diagram of how a PLC works Figure 1: Components of a PLC The input and output units is what connects the input and output devices to the CPU. The output unit carries out the commands that the CPU performed via the program stored in the PLC’s memory. The input and output units each have slots that holds the wires from the different input and output devices. These arrays of slots are called a rack. The rack creates a physical connection from the input and output devices to the CPU. Examples of input devices include switches, push buttons and measurement devices. Output devices include lights, horns, valves, motors etc. There are two types of input and output devices:  Discrete  Analog Discrete input and output devices are very simple devices. They can either be on or off. The coding for these types of devices consists of 1’s and 0’s 1 representing on and 0 representing

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