电动执行器走向总线化与网络化

Bus and network development trends of electric actuator

在，以*域网技术为基础的工厂自动化工程技术在近十年来得到了长足的发展，作为自动控制中自动化仪表之一的电动执行器为适应这一发展趋势，也应具有标准的串行通信接口,如RS-232或RS-422接口等,和的局域网接口，以增强其与其它控制设备间的互联能力，只需要一根电缆或光缆，就可以将数台、甚至数十台电动执行器与上位计算机连接成为整个数控系统。现场总线是安装在生产过程区域的现场设备/仪表与控制室内的自动控制装置/系统之间的一种串行、数字式、多点通信的数据总线。

In the world, the factory automation engineering technology based on industrial LAN technology has achieved considerable development in the last ten years. As one of the automation instruments in automatic control, the electric actuator should have a standard serial communication interface to meet this development trend, such as RS-232 or RS-422 interfaces, and dedicated LAN interfaces to enhance their ability to interconnect with other control devices. There is only required a single cable or optical cable, and several or even dozens of electric actuators can be connected with the upper computer to become the whole CNC system. The field bus is a serial, digital, multi-point communication data bus between the field device/instrument and the automatic control device/system in the control room installed in the production process area.

现场总线企业网作为今后控制系统的发展方向，以其所具有的开放性，网络化等优点，使它与Interent的结合成为可能，现场总线技术应用于电动执行器成为必然趋势 。

Fieldbus enterprise network as the development direction of future control system, with its advantages of openness, networking, etc., make it possible to integrate it with Internet. Fieldbus technology applied to electric actuators will become an inevitable trend.

现场总线技术的应用，取代了传统的4～20mA模拟信号，实现了电动执行器的远程监控，状态、故障、参数信息传送，完成远程参数化工作，提高了它的可靠性，降低了系统及工程成本。目前有影响的现场总线主要有PROFIBUS，FF，HART，CAN等，其实，国外目前的智能电动执行器一般都带有现场总线接口，我国也开发了一些带现场总线接口的智能型电动执行器。

The application of fieldbus technology replaces the traditional 4-20mA analog signal, realizes the state, fault and parameter information transmission of remote monitoring of electric actuator, completes the remote parameterization work, improves its reliability, reduces the system and project cost. At present, the influential fieldbuses are PROFIBUS, FF, HART, CAN and so on. Actually, foreign current intelligent electric actuators generally have field bus interfaces, and China has also developed some smart actuators with field bus interfaces.