In these critical fields, the system generally has large scale and complicated logic function, and requires very high reliability and safety of the software.
在这些领域中，软件系统规模庞大，逻辑复杂，其可靠性和安全性往往有很高的要求。
The design of control program is a very important link in the develop study of PLC's application system, especially in its large -scale application system.
控制程序的设计是PLC应用系统研制的重要环节，特别在大型PLC应用系统中，其重要性就更为突出。
Power plant of modern power system has large capacity and the proportion of large-scale power plant is very big.
现代电力系统发电厂容量很大，大型发电厂在系统中所占容量比例很高；
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