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Characteristics of DCS

(1) Strong control function. It can achieve complex control laws, such as cascade, feedforward, decoupling, adaptive, and nonlinear control. Sequential control can also be achieved.

(2) High system reliability.

(3) The CRT operation station has a good human-machine interface.

(4) The software and hardware adopt a modular building block structure.

(5) The system is easy to develop.

(6) Using configuration software, programming is simple and operation is convenient.

(7) Having good * * *.

Programming convenience: Although there are no actual relays, time relays, or counters inside the PLC, these devices actually exist through the program (software) and system memory. The number of them is unimaginable for relay control systems. Even for small PLCs, the number of internal relays can be counted in thousands, while time relays and counts can also be counted in hundreds. Moreover, the contacts of these relays can be used * * * times. There are so many internal logic devices in PLC that users no longer feel any restrictions when using them. All that is considered is the entry and exit points. And it doesn't matter how much internal entry and exit points are used. The control points of a large PLC can reach over ten thousand, how can there be such a large real-world system? If it is not enough, it can be controlled online without any restrictions. The instruction system of PLC is also very rich, which can easily achieve control of various switching values and analog quantities. The PLC also has a memory area for storing data, which can store all the information to be saved during the control process In short, due to the strong functionality of PLC, its role in the control system is no longer limited by the PLC itself, but by people's imagination or other hardware facilities associated with it.

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