What is the Difference Between PLC and DCS?
What is the Difference Between PLC and DCS?
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In a nutshell, a PLC or programmable logic controller is a ruggedized computer used for automating processes.
A DCS or distributed control system is similar to a PLC in that is has rugged computer controllers however the DCS contains multiple autonomous controllers that are distributed throughout a system, also used for automating processes.
As you can tell, there are likely advantages and disadvantages in both systems. The take away is that with today’s technologies, either system can control an entire plant. Which system is chosen will likely take the advantages and disadvantages into account as well as system costs.
In summation, the DCS has autonomous controllers dispersed throughout the entire plant. If a controller fails, the entire plant doesn’t necessarily get impacted. It also has the onboard monitoring and control that saves development time. A single PLC is a single point of failure. You surely wouldn’t want to control an entire plant with a single PLC, however; a connected PLC system can have nearly the same security and robustness as a DCS.
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What is the Difference Between PLC and DCS?
What is the Difference Between PLC and DCS?
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Perfect 👍👍
So many process sir…nice video
@7:59 so true – used to work at a plant that had an old DCS that was slowly being made obsolete via ABB acquisition (to push there DCS platforms). One contractor with specific programming/hardware experience had 3rd party near monopoly for a good chunk of West coast US, made a career out of it.
Excellent video will definitely recommend this channel to others!!
A PLC could have a Primary Processor fail and take out a whole system as compared to one system in a DCS that goes down. But I guess if you maybe build the PLC system right and add redundancy with a Primary & Secondary Processor network, if that system ever going down it should be far less an issue. It should switch and barely skip a beat.
Great video. That fact that you missed was the DCS was used more in the past in large control systems because early PLC's were not capable of handling analog values. I saw a Honeywell DCS system completely replaced with Rockwell PLC's and a PC based HMI system. The 2 systems were almost identical to the process operator.
Korean subtitles are required.
You got a lot of things right on this video, but a lot of this information is extremely misleading. "You wouldn't want to control a single plant with one PLC," you said. I've never seen an entire plant small enough for a single PLC to control it, but PLCs are far more scalable than a DCS. Often a single PLC will be employed for a very limited system and will communicate with other such PLCs, creating a network of PLCs that is far more "distributed" than a DCS (Distributed Control System). And any DCS can have a controller fail, which would bring down a significant part of the process and other parts that relied on it in the flow of product. The platform you use is essentially irrelevant. You suggest that PLC programming is something of a commodity while DCS programming is highly specialized. That just isn't true; it's platform dependent. There are thousands of Rockwell programmers in the US, but far less Mitsubishi programmers, but both are PLCs. And for DCSs that have been around a while, you can find plenty of engineers with applicable experience. The thing you got most correct is that with the technology available today, almost any process can be successfully controlled with either a PLC or a DCS. The selection mostly depends on specific plant applications and company preferences.
Exelent information
👍👏👏
I'd like to know if all this youtubes videos are included in the Realpars website courses?
For simplifying plc is an industrial version of arduino👍👍👍👍
Thanks friend. I want to working with you. How to have opportunity?
Thank you for creating such a wonderful video
And whats the difference btween SCADA and DCS? Is its their database size?
Many aspects are not mentioned. The DCS has been process oriented from day one where PLCs more discrete. PLC vendors are trying to get there and are better in process but still not equal. Redundant control processors for example whereby a control processor in a DCS can be removed during operation, fail over with no affect on process – have done it many times. Communications capabilities of the DCS vs most PLCs, network redundancy, as well as incremental downloads and online programming of the DCS. I have seen PLCs that will go offline with down load – and fault on divide by 0!. For plants that have maintenance shut downs measured in years this is unacceptable. Also, cost. A DCS was once much more expensive where now a PLC based system that comes close to capabilities of a DCS with redundancy on network and control levels is often more expensive in PLCs and much more difficult to implement. Depends on your needs.
Thanks Realpars
Can please make videos related to calibration of field instruments
Thank you for the free educational material provided for us and the wonderful style of explanation could you please told me what the program you use to create these great videos to do the same for my channel
Nice video
Thanks for sharing
i love too much
thanks from peru
I worked with Modicon PLC controllers 184, 384 ,484 and finally 1084 systems. They were really reliable and easy to program.Hats off to the rugged design . We had 25 systems and i should proudly say none of the I/O modules nor CPUs failed for 25 years ,except few power supplies and RIO interface.