Answer / ahmed assem

PLCis a device which makes control on machines,DCS is a
system not a device which makes you mentoring what the
controllers are doing and it allows you to control
it.(that's in a simple way)

Answer / kesavan

PLC MEANS PROGRAMMING LOGIC COTROL
DCS MEANS DISTRIBUTED CONTROL SYSTEM

Answer / bhaveshsavaliya

As we define PLC as programmable logic control,it has some
limitation related to its features like limitation of its
input/outputs,No.of Analog/digital interface and many other
which are applicable for only one particular application.

While DCS is also a control used for same application as
PLC,but when it Comes to your applications,you must know
difference between this ,For Example Like mega Power plant
or big capacity Refinery,where multiple task where
controlling at same time, which could not possible via
PLC,but we have to make mass communication between such PLC
modules which controlling such different task and give
feedback to masters,this will then define as Distributed
control system and make a huge task possible without any
Complication,consumption and failure.

Answer / arumugam

PLC is a Controller in which used to operate the
mechanical or electrical components like water pump. For
example, If the water level goes low in the water tank, The
low level sensor give the signal to the PLC,then the PLC On
Commamnd singnal goes to Electrical panel to start the
water pump. It is called give and take command

DCS is device which is used to operate the mechanical or
electrical components through your PC. From the PLC HMI
Display controller, take the all command to DCS which is
programmed in your PC. So It is easy to identify or check
mechanical or electrical components running condition and
also it can be run the motor through DCS which you are
sitting in PC.

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