集散控制系统的一个比较突出的优点是利用网络通信将分布在现场或附近的现场控制站连接起来,共同完成分散控制和集中管理的功能。这样一来,既可以大大提高整个系统的功能,又可以提高系统的可靠性,并降低了信号线的长度,便于维护。因此,现场控制级构成了DCS 的基础。一般,现场控制级完成物理信号的采集、处理(放大、隔离、滤波)、转换、越限和状态检 A more prominent advantage of distributed control system is the use of network communications will be distributed in the field or near the site control station connected together to complete the decentralized control and centralized management functions. In this way, the function of the entire system can be greatly enhanced, the reliability of the system can be improved, the length of the signal line can be reduced, and the maintenance can be conveniently performed. Therefore, the site control level constitutes the basis of DCS. In general, on-site control level to complete the physical signal acquisition, processing (amplification, isolation, filtering), conversion, overrun and state inspection