Choose DCS or PLC
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There is a project with 400 analog input points (of which 50 are for control valves) and 200 digital input points. So, should we choose a DCS or a PLC for this control system?
With a large number of control loops, it is more reasonable to use DCS; performing control loop calculations with PLC is rather complex, and the load on the PLC controller for 50 such loops is likely to be very high
It depends on whether your process control approach leans towards process control or on/off control. DCS is designed for process control, and it is recommended to use DCS for applications that require precise control over parameters such as setpoints and formulations. On the other hand, PLC can be used in such cases. Nowadays, domestic DCS systems are not expensive; for example, those produced by Zhejiang University Zhongkong. If the number of control points is low, the investment required will also be minimal.
Choose a domestic DCS; its price isn’t high either, after all, you have many analog input points here. Although current PLCs can meet your requirements, they are rather cumbersome to configure and maintain when there are many analog inputs. Although the manufacturer handles the setup initially, subsequent maintenance still has to be done by you.
It is recommended to choose between domestic DCS brands and foreign major PLC brands.
There are many control systems; it is recommended to use a DCS.
It is recommended to use a DCS system, as it facilitates maintenance later on, and it will also be convenient for any future modifications. The subsequent maintenance costs of PLCs are relatively high; it is recommended to use domestic DCS systems, such as Zhejiang University Zhongkong or HollySys.
DCS is easy to control, and fault handling is simple
DCS should be more convenient
It is recommended to use DCS. It has good scalability and a user-friendly interface; competition is fierce these days, yet the purchase price isn’t high. The accessories, however, are a bit more expensive.