Yildirimģ language similar to machine code, Ladder logic (LAD) for users who are accustomed to working with circuit diagrams, and Function Block Diagram (FBD) for users who are familiar with the logic boxes of Boolean algebra. There are three different programming languages in the STEP 7: statement list (STL) for users who prefer programming in a EE432 Industrial Electronics, Spring 2012 Experiment 2, page 2/12 Last updated February 22, :39 PM by D. Main parts of a S7-300 PLC STEP 7 software is used to program the PLC. Communication Module (CP) Programming with STEP 7: Figure 2. Analog Output Module: Voltage and Current.
Analog Input Module: Voltage, Current, Resistor and Thermocouple, 4. Digital Output Modules: 24 V DC transistor, 3. Digital Input Modules: 24 V DC transistor, 2. There are three different models for 2 A, 5 A, and 10 A max.
It includes the following components: Power Supply (PS): It is required to supply the modules connected to the PLC. The S7-300 mounted on a rack is shown in Figure 2. The general features of S7-300 are it has a modular PLC system developed for medium performance projects, it features different modules for different automation problems, it is easy to re-program the device when an improvement is needed for the process, it is possible to be connected to communication networks such as MPI, Profibus and Industrial Ethernet, it has a vast amount of command set for programming. YildirimĢ SIMATIC S7-300 PLC will be used to control the operation of a demand-actuated traffic light system in an intersection. EE432 Industrial Electronics, Spring 2012 Experiment 2, page 1/12 Last updated February 22, :39 PM by D. Today, PLCs are used in many "real world" applications such as machining, packaging, material handling, automated assembly or countless other industrial processes. The PLC works by looking at its inputs and depending upon their state, turning on/off its outputs as depicted in Figure 1. List of Equipments Traffic Light Crossing PLC Basic Unit 3SB A Normally Open (NO) Push-button switches (x3) General Information: Siemens SIMATIC S7-300 A Programmable Logic Controller (PLC) is a device that replaces the necessary sequential relay circuits for machine control.
Applying the PLC to control the operation of a demand-actuated traffic light system in an intersection. Programming the PLC with the STEP 7 software. 1 YEDITEPE UNIVERSITY ENGINEERING & ARCHITECTURE FACULTY INDUSTRIAL ELECTRONICS LABORATORY EE 432 INDUSTRIAL ELECTRONICS EXPERIMENT 2 TRAFFIC LIGHT CONTROL SYSTEM FOR AN INTERSECTION USING S7-300 PLC Introduction: The main objective in this experiment is to: Understanding the programmable logic controller and its peripherals.
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