Scada for remote industrial plant

SCADA for Remote
Industrial Plant

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Introduction
SCADA for Remote Industrial Plant
 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.

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.

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.

Scada for remote industrial plant

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