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随着计算机在工业控制领域的广泛应用，控制局域网也深入应用到各种控制系统中。现行的控制系统往往是多机系统，即采用控制网络技术，将众多控制系统单机有机地连成一体，构成分布式控制系统。 目前我国较为流行的现场通信网络有RS232、RS485、HART、PROFIELBUS、CAN、LON
With the wide application of computer in the field of industrial control, the control area network is also deeply applied to various control systems. The current control system is often multi-machine system, that is, the use of control network technology, many of the control system will be a single organic integration, constitute a distributed control system. At present, China’s more popular on-site communication network RS 232, RS 485, HART, PROFIELBUS, CAN, LON