Scada monitoring system
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This document describes a SCADA-based temperature monitoring system that uses 8 temperature sensors and an AT89S52 microcontroller to monitor temperatures. The microcontroller collects temperature readings from the sensors, converts them to digital with an ADC0808, and sends the values serially to a computer using a MAX32 IC. Software on the computer displays the readings, logs them to a database, and allows setting temperature setpoints. If temperatures exceed limits, the microcontroller controls a relay driver to turn heaters on or off.
Scada monitoring system
- 1. SCADA BASED TEMPERATURE MONITORING SYSTEM Submitted by: Vipul Mehta 06111503009 Manav Mittal 07211503009 Shaily Pal 07611503009 Sajal Jain 08911503009
- 2. INTRODUCTION • Temperature logging System with 8 temperature sensors in multiplexed mode fed to the MC through ADC 0808. • Values of the sensors sent serially by MC through Max 32 IC to the Computer. • Software “DAQ System” on the Computer takes these values, shows them on its front panel, logs them to the data base "daq.mdb". • Parameters like set point, low limit, and high limit on the computer screen can be set. • Increase in temperature beyond set point enables MC to control relay driver IC ULN2003. • The heaters are turned ON or OFF with the activation of alarm on temperature reaching above high limit or below low limit.
- 5. HARDWARE REQUIREMENTS Components Type Power Supply 5V DC Microcontroller AT89S52/AT89C51 ADC 0808 Serial Communication MAX232 Relays Connector DB9 Temperature Sensor LM35 ULN 2003 LED Resistor & Capacitor
- 6. POWER SUPPLY 230 V AC 50 Hz 5V DC 12V step down transformer Filter(470µf) 5v RegulatorBridge rectifier
- 7. MICROCONTROLLER 8051 Has on-chip RAM, ROM, I/O ports. A smaller computer
- 9. ADC 0808 • Data acquisition component,monolithic CMOS device. • 8-bit analog-to-digital converter, 8-channel multiplexer. • Uses successive approximation as the conversion technique. • Resolution 8 Bits • Total Unadjusted Error ±1⁄2 LSB and ±1 LSB • Single Supply 5 VDC
- 10. MAX 232 • Converts signals from an RS-232serial port to signals compatible in TTL digital logic circuit. • Dual driver/receiver. • Changes a TTL Logic 0 to between +3 and +15V, and TTL Logic 1 to between -3 to -15V, and vice versa for converting from RS232 to TTL.
- 11. DB9 CONNECTOR The DB9 (originally DE-9) connector is an analog 9-pin plug of the D-Sub miniature connector family (D-Sub or Sub-D).
- 12. TEMPERATURE SENSOR(LM35) • Precision integrated-circuit temperature sensors. • Output voltage is linearly proportional to the Celsius temperature. • No requirement of any external calibration or trimming to provide typical accuracies of ±1⁄4˚C at room temperature and ±3⁄4˚C over a full −55 to +150˚C temperature range.
- 13. RELAY DRIVER (ULN 2003) • A high voltage and high current Darlington transistor array. •Includes seven NPN Darlington pairs amalgamating high- voltage outputs with common-cathode Clamp diode for switching inductive loads. •Has 2.7kW series base resistor for each Darlington pair for operation directly with TTL or 5V CMOS devices.
- 14. RELAY •Electro magnetic switch •Used to control the electrical devices •Operation by copper core magnetic flux. •COM = Common, always connect to this; it is the moving part of the itch. •NC = Normally Closed, COM is connected to this when the relay coil is off. •NO = Normally Open, COM is connected to this when the relay coil is on
- 16. • Retrieves real time data from the high temperature furnaces on computer using LM35 sensors. • Data converted to digital through ADC0808. • As LM35 is heated the voltage at output pin increases, it is connected to the analog to digital convertor IC (ADC). • Now MC process this data and communicates with computer via RS232 communication and simultaneously switches ON & OFF the relays. • Max232 IC is used for RS232 communication and ULN2003 IC is used for relay control. • Software is used for keeping the real time records of heat sensors in computer. This software has a provision for eight sensors but only four have been used here. FUNCTION
- 18. SOFTWARE REQUIREMENTS Keil an ARM Company makes C compilers for ARM7/ARM9/Cortex-M3, XC16x/C16x/ST10, 251, and 8051 MCU families. Compilers are programs used to convert a High Level Language(source code) to object code. The programs written in one of the HLL like ‘C’ will compile the code to run on the system for a particular processor like x86 (underlying microprocessor in the computer).
- 20. APPLICATIONS Small ruggedized computer provides intelligence in the field and allows the central master to communicate with the field instruments. Used in process industries where there is a need for simultaneous and fast acquiring of data and control.
- 21. ADVANTAGES Allows us to view all the parameter readings simultaneously on the PC screen.
- 22. FUTURE SCOPE Food Monitoring Industry Temperature Control in a Multi-level Building Temperature Monitoring in a Mall
- 23. THANK YOU