logic controller (PLC) is a
digital computer used for automation of
electromechanical processes, such as control
of machinery on factory assembly lines,
control of amusement rides, or control of
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Selecting a PLC:
Number of logical inputs and O/P.
Number of special I/O modules
HMI (Human Machine Interface) is a medium for information exchange
and mutual communication between electromechanical system's and
the user. It allows the user to complete settings through touchable
images or keys on the user-friendly window. This not only offer's fast
and convenient control of manufacturing automation, but also has
replaced traditional controlling panel's which need extensive wiring
Introduction (What Is SCADA?)
1.Stands for supervisory control And data
2.SCADA systems are used in industrial
processes: steel making, power generation
(conventional and nuclear) and distribution.
3.There Are 4 Components In the SCADA
Sensors, devices to control.
Remote Terminal Units.
RTU Vs. PLC
Equipment needed to transfer data to and from different sites
Central Monitoring Station
Collecting information gathered by the remote stations to
generate the necessary action
PLC Vs Computer
Designed for extreme
Can operation in high
temperature and humidity
High immunity to noise
No secondary memory
available (in the PLC)
Optimized for Single task
Designed mainly for data
Optimized for speed
Can’t operate in extreme
Can be programmed in
Lost of secondary
Why PLC ?
The controller is designed in modular form, so
that sub-assemblies could be removed easily for
replacement or repair.
The control system needs the capability to
pass data collection to a central system.
The system becomes reusable.
The method used to program the controller is
simple, so that it can be easily understood by
Advantages of PLCs:
Wiring between devices and relay
contacts are done in the PLC program.
Easier and faster to make changes.
Trouble shooting aids make programming
easier and reduce downtime.
Reliable components make these likely
to operate for years before failure
Areas of Application