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计算机控制系统中广泛使用模拟仪表系统中的传感器、变送器和执行机构。它们一般通过4～20mA的电流信号与计算机交换信息,这种传输方法使用的导线多,现场安装工作量大,投资高,传输精度低,易受干扰。计算机和操作人员在控制室不了解现场装置的工作情况,不能对其进行参数调整和故障测试,因此它们成了系统中最薄弱的环节。为解决上述问题,现场总线应运而生。
Computer control systems are widely used in analog instrumentation systems sensors, transmitters and actuators. They generally exchange information with the computer through the 4 ~ 20mA current signal, this kind of transmission method uses many wires, the on-site installation workload is heavy, the investment is high, the transmission accuracy is low, it is apt to suffer the interference. Computers and operators are not aware of the operation of field devices in the control room and can not parameterize and troubleshoot them, making them the weakest link in the system. In order to solve the above problems, the field bus came into being.