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A simplified block diagram of a PLC revealed in
preceding Fig. It's three significant units/sections.
1.
Input/Output Modules.
2.
CPU (Central Processing Units).
3.
Programmer/Monitor.
·
The input converts the area signs provided by
input devices/sensors into logic-level symbols the PLC's CPU may see.
·
The Processor Section reads the inputs,
Procedures the sign, and prepares the output signals.
·
The output segment extends the logic level
output signals coming from the chip section to elevated level signs and
utilized to actuate different output field apparatus.
The programmer/monitor can utilize to go into the
consumer's program into memory and also to track the implementation of this
program.
The input has a bank of terminals to get physically
connecting input devices, such as pushbuttons, limit switches etc. into some
PLC. that the function of an input module will be to translate signals from
input into a form which the PLC's CPU will comprehend.
The Output module also includes a bank of terminals
which connect output devices such as solenoids, motor starters, signalling
lamps etc. into some PLC... The part of an output signal module would be to
interpret signals from the PLC's CPU to a form which the output device could utilize.
The activities of this I/O section could categorize as:
·
Conditioning
·
Isolation
·
Termination
·
Indication
A digital system for linking I/O modules to remotely
situated I/O apparatus can add if necessary. The correct operating procedure
under PLC Control maybe tens of thousands of feet in the CPU and its own I/O
modules.
Please read more about PLC hardware NZ &
How to Sell Your Surplus NZ
with us in the next Article.
Next Continuous Article link: CPU- Brain of PLC and Programming unit
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