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. Time delay of 5s has given using timers which will make each cycle with 5s delay.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. Program runs continuously until STOP PB is pressed Timer 7 (T7) done bit is used to restart the cycle from beginning

Same procedures followed to turn on further outputs.( Refer Tabular column for sequence of operation) Network 8 Parallel circuits are added to turn ON/OFF the output in up next sequence.

Starting the timer to turn on output East Green, North-South-West is in red. Latching rung to operate the system through Master Start and Stop PB. You can build your own concept for making logic for this example.įollow below tabular column – Logic for the four way traffic light List of Inputs and Outputs Traffic Light Control using PLC Logic Explanation Network 1 We can take four directions (North, South, west, and east) with three output lamps (Green, Red, and Yellow). The traffic light is one of the classic examples in PLC ladder logic. Design ladder logic for 4 way-traffic light control system

2 way traffic light plc in logixpro