PLC vs DCS | What is the Difference Between PLC and DCS | What is PLC | What is DCS | DCS and PLC

PLC vs DCS | What is the Difference Between PLC and DCS | What is PLC | What is DCS | DCS and PLC

Hello friends Welcome to our Chanel MZD Tech.

Today we will discuss differences between P.L.C and D.C.S

I hope today you will learn and understand the difference between PLC and DCS.
Now A days PLC and D.C.S  both are used to control a process or a machine.
They monitor the field signals and operator inputs and make decisions based on how they are program.

 

First of all we will discuss basic introduction and then discuss difference.

 

The programmable logic controller, or PLC, is ubiquitous in every kind of process and manufacturing industry today.
PLCs were initially designed to replace electromechanical relay systems in order to offer a simpler solution for modifying the operation of a control system.
Rather than having to rewire a large bank of relays, a quick download from a PC or programming device enables changes to the control logic in a matter of seconds.

 

A PLC is composed of a few basic parts.
They might look slightly different from various manufacturers, but the purpose and scope of each component are the same.
These include a power supply, a central processing unit (CPU), input/output cards, and a backplane or rack that the input/output (I/O) cards are placed into.

 

 

(DCS) also known as Distributed Control System is the brain of the control system.
It is used mainly for the automation of a manufacturing process and manages the logic that exist for major unit operations.
A DCS in the past was tailor made for the process, plant or company that intended to use the structure to control and model it's process.
Before the beginning of the DCS era there were pneumatic devices that controlled process and engineers manually turned valves on the site. Modeling of the systems was made possible by DCS as it allowed the ability to record and manage process from comfort of a computer screen. Because of DCS we are able to control processes remotely and gain a better understanding of how the process operate and how they can be improved to both increase safety and increase profit possibilities.

Now time dime to discuss difference.
With emerging technologies, the difference between PLC and DCS has become quite marginal. In spite of that here are a few differences between them.

number one. Redundancy.
PLCs can be made redundant with additional hardwares which makes them expensive than DCS
and.
Redundancy is a default feature of distributed control system.

Number Two. Speed of response.
PLCs are can respond to a change within one-tenth of a second.
and.
DCS are slower than PLCs. Typical respond time of DCS is 30 mili second.

Number Three. IO capacity.
A PLC is capable of handling few hundred IOs. When it comes to analog IOs, it can handle tens of them.
and.
A DCS can handle thousands of IOs. It can handle hundreds or even thousands of analogs IOs and PID functions.

Number Four. Logic development.
PLC can programmed be programmed based on our application.
and.
DCS comes with built-in control functions that need to be configured based on the application.

Number Five. Architecture.
PLCs have a simple and flexible architecture. A PLC system consists of controllers, IO modules, HMIs and an engineering software.
and .
DCS systems are less flexible. They come with controllers, IO systems, database servers, engineering and operating servers.

Number Six . Application.
PLCs are best suited for dedicated applications that changes less often.
and.
DCS is suitable for complex processes that require advanced process control capability.

Number Seven. Cost.
programmable logic controllers are cheeper.
and D.C.S system is more expensive.

#plc
#dcs
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