DCS:
The distributed control system DCS is a monitoring technology integrating 4C(Communication,Computer,Control,CRT)technology.
A large system of tree topology from top to bottom,in which communication is the key.
PID in the interruption station,the interruption station connects the computer with the field instrumentation and the control device is a tree topology and a parallel continuous link structure,and there are also a large number of cables from the relay station to the field instrumentation in parallel.
Analog signal,A/D-D/A,mix with microprocessor.
One instrument is connected to the I/O by a pair of lines,and is connected to the local area network LAN by the control station.
DCS is a three-level structure of control(engineer station),operation(operator station),and field instrument(field measurement and control station).For large-scale continuous process control,such as petrochemical,etc.
DCS：
分散控制系统DCS集4C（Communication，Computer，Control、CRT）技术于一身的监控技术。
从上到下的树状拓扑大系统，其中通信（Communication）是关键。
PID在中断站中，中断站联接计算机与现场仪器仪表与控制装置是树状拓扑和并行连续的链路结构，也有大量电缆从中继站并行到现场仪器仪表。
模拟信号，A/D—D/A、带微处理器的混合。
一台仪表一对线接到I/O，由控制站挂到局域网LAN。
DCS是控制（工程师站）、操作（操作员站）、现场仪表（现场测控站）的3级结构。用于大规模的连续过程控制，如石化等。
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