Abstract
In this report we will
learn about what is the programmed logical control (plc) ; also we will talk about the advantages
and disadvantages of this system and the sequence that is inside it then we
will mention some of the applications and not all of the applications because
its applications are very many this research is not enough for us
Introduction and Research Objectives
Nowadays,
the PLCs have substituted most of the control elements used to conduct the
device logic. The word logic is used because the programming relates primarily
to logic implementation and switching operations. Controlled input devices such
as switches and output devices such as motors are connected to the PLC and then
the controller monitors the machine or process inputs and outputs. PLCs were
originally developed as a replacement for forward wired relay and timer logic
control systems.(Hard cabling means all the components were connected manually
by wires).Technological progress in recent years has led to the development of
a programmable logic control unit (PLC) and a subsequent revolution in control
engineering.
This
research explains some applications to show the developed programs
To
complete specific tasks. These include tasks that include filling bottles and
operating the parking barrier using valves.
But before all this, several important elements must be known before
speaking. Applications are the definition of programmatic logic control and its
different types.
Definition of PLC’s
PLC's can be defined as a digital electronic
device that uses a programmable memory to store information
(commands) that performs specific instructions (logical, sequential, time,
numerical, and mathematical) to control industrial machinery and equipment
Advantages of PLC’s
Reliability.
The programming
and reprogramming be Flexibility.
Cost-efficient
to control complex systems.
Physical size
small, project time shorter.
Fast Running
speed.
Able to
connect with the plant's computer systems.
Simple to
manage/troubleshoot.
Reduced
space.
saving energy
Less cabling.
In the PLC
program, cabling between devices and relay contacts is done. Make improvements
simpler and cheaper.
Helps to
troubleshoot improve planning and reduce downtime.
Durable
components allow such components possible to work for years before failure.
Disadvantages
PLC devices
are proprietary, meaning that one manufacturer's part or software can not be
used in combination with other manufacturer's parts.
Choice for
small size and expense
fixed Operations Chain.
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