scada for remote industrial plant

SCADA for Remote Industrial Plant

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Introduction


SCADA (Supervisory Control And Data Acquisition) for Remote Industrial Plant is designed for achieving and controlling the real time data remotely by the administration for large scale industries. Many processes are going on in the large scale industries where monitoring and controlling all the processes at a time is not possible manually . It is achieved by the adapting technology like SCADA.

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Block Diagram







Hardware Components• 8051 series Microcontroller

• ADC

• Temperature sensors

• Max232

• Relay Driver IC

• Crystal

• DB9 connector








• Resistors

• Capacitors

• Diodes

• Transformer

• Voltage Regulator

• Relays

• Transistors

Hardware Components






Software Components

Keil compiler

Language: Embedded C or Assembly







MAX 232

MAX232 is an integrated circuit that converts signals from an RS-232 serial port to signal suitable for use in TTL compatible digital logic circuit.

The MAX232 is a dual driver/receiver and typically converts the RX, TX, CTS and RTS signals.

When a MAX232 IC receives a TTL level to convert, it changes a TTL logic 0 to between +3 and +15V.







Microcontroller AT89S51/52

AT 89S51 IC has an internal program that is easy to remove and re-programmed over and over - again.

AT 89S51 IC is also used as modifiers for the thermal sensor temperature.







Microcontroller Features It consist of 8K bytes of In- System Programmable (ISP) Flash Memory.

Endurance: 10,000 Write/Erase Cycles.

4.0 V to 5.5V operating range.

Fully Static Operation: 0Hz to 33MHz.

Three 16 bit timer or counters.

Eight Interrupt Sources.








Voltage Regulators

A voltage regulator is an electronic circuit which maintains the output voltage (almost) constant in spite of changes within some specified limits in the load current, input voltage, temperature, etc.

An IC based voltage regulator can be classified in different ways. A common type of classification is 3 terminal voltage regulator and 5 or multi terminal voltage regulator.






System Operation

Temperature sensors are befittingly interfaced to the 8051 micro-controller which is in turn connected to a PC.

On the front end, “DAQ System” (software) loaded in the computer which takes these values and displays them on its front panel, and also logs then in the database.

One can set parameters like set point, low limit and high limits on the computer screen.

When temperature of a sensor goes above the set point the micro-controller sends a command to the corresponding relay.







The heaters are connected through relay contacts (corresponding to their sensors) are turned OFF.

And are available for generating an AV alarm on the PC in the event of system failure.

Hence, processes at hazardous area can be controlled accurately and better safety using Supervisory Control and Data Acquisition.

Adapting such a technology will save both money and time.

System Operation







Working Principle

For achieving the real time scenario for SCADA, a temperature logging system for a remote plant operation is taken.

Here temperature sensors are interfaced to the 8051 microcontroller with help of a 8 channel ADC device.

Where the temperature sensors collect the data and send them to the microcontroller.

The heaters (shown as lamps) are connected to relay contacts corresponding to their sensors which are controlled by the relay driver IC.


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Working Principle This system is interfaced to the PC using RS-232 cable having a GUI

for interactive actions by the operator.

Whenever temperature of a sensor increases from set point of the GUI, the microcontroller sends a command to the corresponding relay.

The relay is made to switch ON and OFF the heater (a lamp load) to maintain the set temperature.

Hence, the high limit and low limit features are available for generating an AV alarm on the PC in the event of any abnormal situation.







Working Principle

At the front end, “DAQ System” software is loaded on the computer which takes sensor values.

And display those values in front of the panel and also logs them in a database.

The software has the provision for setting of the sensor parameters such as set point, low limit and high limit on the computer screen.

Hence, in the large scale industrial plants control many processes with more accuracy and better safety using SCADA.







Advantages

Continuous monitoring of process

Automation and protection

Remote control and operation

Real time control







Applications

A SCADA application has two elements:

The process or system that needs to be monitored and controlled.

Devices you will use to perform monitoring and controlling functions.







Conclusion

SCADA for Remote Industrial Plant circuit has been designed and data from different analog loads has been acquisitively and digitally displayed on PC. Several loads have been monitored on PC in real time. These systems are used to monitor and control a plant and equipment in industries.


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scada for remote industrial plant

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