What is the difference between DCS and PLC? !
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What is the difference between DCS and PLC? ! In principle, it’s the same! In fact, making good use of certain PLCs is not worse than DCS! !
Now, Siemens’ PCS7 is just like a DCS
The former integrates multiple small control systems, while the latter is a single small system
Well, that’s a way to put it too! Can a PLC be used for system integration? It should be okay, right? !
DCS stands for Distributed Control System (decentralized control, centralized management), while PLC stands for Programmable Logic Controller. DCS focuses on system control and analog input/output, while PLC emphasizes electrical control, mainly through digital output. However, the two are now merging with each other, and it is likely that they will become integrated in the future.
It used to be said that DCS places more emphasis on analog input/output and control, while PLCs are mainly used for controlling relays, that is, digital signals. Nowadays, the boundary between the two is becoming increasingly blurred. For large-scale equipment, where there are many control points, DCS seems to be the preferred choice; whereas for small-scale equipment with fewer digital control points, PLCs are chosen.
The number of points controlled by PLC should be smaller, while the scale of DCS control is relatively larger
Yes, the boundaries are becoming increasingly blurred! !
There was definitely a difference 20 years ago or even 10 years ago. However, PLCs are becoming increasingly capable of performing analog calculations, while DCS systems have stronger logical reasoning functions; as a result, the conceptual boundaries between these two systems have become quite blurred. For example, Siemens’ DCS is based on PLCs ； Many small DCS systems, in terms of price and actual functionality, also perform the functions of PLCs.
Put simply, their backgrounds are different: one is from a poor family while the other is from a wealthy family, although the one from a poor family often ends up doing the same work as those from wealthy families.
Haha, bird silk is the real useful one! ! !