Especially data transmission protocol, applicative occasion and connective means with field intelligent devices of PROFIBUS-PA are studied.
着重研究了现场总线profibus - PA采用的数据传输协议、适用的场合和与现场智能设备连接的方法。
None of a real time maintenance system for field intelligent devices has been developed in China till now, and people maintain these field devices according to their experience in a traditional way.
目前国内还没有现场设备实时维护系统，传统工厂设备的管理维护工作一般均是基于经验进行的。
Fieldbus intelligent field devices are connected and digital automation system, two-way transmission, multi-branch structure of the communications network, based on smart meters.
现场总线则是衔接智能现场设备和主动化系统地数字式、双向传输、多分支构造地通讯收集，其根底是智能仪表。
Fieldbus intelligent field devices are connected and digital automation system, two-way transmission, multi-branch structure of the communications network, based on smart meters.
现场总线则是衔接智能现场设备和主动化系统地数字式、双向传输、多分支构造地通讯收集，其根底是智能仪表。
应用推荐