Room Temperature Control Us

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  • Topic: Programmable logic controller, Ladder logic, Relay
  • Pages : 7 (1618 words )
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  • Published : May 18, 2013
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International Burch University Faculty of Engineering and IT Electrical and Electronics Engineering Department

EEE 307 Industrial Electronic Final Project Topic: ROOM TEMPERATURE REGULATION

Prepared by: Ribić Emir, Smajkić Sadžid

May 2013

Table of contents

Abstract…………………………………………………………………………2 Overview………………………………………………………………………..3 Goal……………………………………………………………………………..7 Scope…………………………………………………………………………....7 Hardware………………………………………………………………………..8 Software…………………………………………………………………………10 Conclusion………………………………………………………………………14 Appendix………………………………………………………………………….15

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Abstract
Room temperature regulation using Programmable Logic Controller (PLC) The goal of this project is to develop a fully functional and controllable automated system which is able to control and maintain the stability of the ambient temperature of a room. Similar systems are usually found in industry where i.e. maintenance of a storage room temperature is needed. The simulation was done by using Schneider Electric Zelio Soft 2 software. The particular model used was Zelio PLC Schneider SR2 B121 BD (24 V DC) with analog inputs. Pushbutton and Selector switch are used from discrete inputs which are assigned as ON/OFF Switch and Mode Selection Switch respectively. Two analog inputs are also used which are assigned as Ambient temperature and Setpoint. On the output side of the PLC a heater and a fan are used to simulate the entire process. Using software, Function Block Diagrams (FBD) are programmed to control the system.

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Overview About PLC (Programmable Logic Controller)
In general, a PLC is an industrialized computer that includes the hardware and software required to automatically control production equipment, machinery, processes, and other types of mechanical, electrical, and electronic devices typically found in industry. On the other words a PLC is the key element behind today‘s industrial automation. The PLC is mostly recognized as being introduced by Bradford Associates in nineteen sixty eight. Because it is programmable, the PLC also allows quicker changes to the equipment‘s control behavior. What to the individual words in PLC mean? It may make more sense to take the words in reverse order. Controller is the key word in programmable logic controller. The PLC monitors various conditions and based on these condition determine an outcome. In other words it has ability to control devices wired to its output terminals based on the statute of the devices wired to its input terminals Logic is how we treat the various conditions we monitored which determines our final outcome. The decisions are based on logical rules that we teach the PLC by way of its programming software. Programmable – The PLC is taught rules to how it should use the input condition to create an outcome though it’s programming software. Being programmable makes it versatile, so if needs or conditions changes, the PLC can be reprogrammed to meet these changes. It also includes the flexibility to reprogram its decision making behavior trough the software as often as needed. PLC hardware and software allows it to monitor the status of incoming events and control the outcomes. Aside from their primary use in automating factories and processes PLC are also used in simple applications such as elevators, car washes, traffic lights. More complex PLC application includes water plants manufactories, assembly lines, machinery and bottling lines etc.

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Internal structure of PLC

Input devices:           Pushbuttons Limit switches Level switches Photoelectric sensors Proximity sensors Motor starter contacts Relay contacts Thumbwheel switches 120/230 VAC 24 VDC

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Output devices:            Valves Motor starters Solenoids Control relays Alarms Lights Fans Horns Relays Triac Transistor/MOSFET

PLC Advantages        Eliminates much of the hard wiring, it can be observed visually Safe Increased Reliability (very fast) More...
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