Lem - Fieldbus based Network Sensor - Manufacturer [Weikewei]

field bus It is precisely under the demand for intelligent field instruments and fully digital control systems that a digital, bidirectional transmission, multi branch communication network connecting intelligent field devices and automation systems has emerged. Its key feature is support for all digital communication, and its main characteristic is high reliability. It can connect all on-site devices (instruments, sensors, and actuators) with the controller through a single cable, forming a digital communication network at the on-site device level and workshop level, which can complete functions such as on-site status monitoring, control, and remote transmission.sensorThe goal of intelligent instrumentation is the on-site processing of information, which is also the goal of fieldbus technology and a symbol that distinguishes fieldbus from other computer communication technologies.

Due to on-site reasons总线The obvious superiority of technology has become a hot research and development topic internationally. Major companies have developed their own fieldbus products and established their own standards. At present, there are dozens of common standards, each with its own characteristics, which have been well applied in their respective fields. However, based on fieldbus technologyNetwork sensorsIt also faces many problems. The main reason for the problem is the coexistence of multiple fieldbus standards. For example, current network sensors include those based on the Foundation fieldbus FF standard and those based on the ProfBus standard. In China, there is a lot of research on sensors based on the RS-485 bus.

Due to the incompatibility of dozens of existing fieldbus standards, the intelligence of different manufacturers传感器They all use their own bus standards, so currently the communication between smart sensors and control systems is mainly based on analog signals, or digital signals are superimposed on analog signals, which obviously greatly reduces communication speed. This seriously affects the application of fieldbus based intelligent sensors. To address this issue, IEEE has developed the IEEE1451 standard, which simplifies the connection between control networks and smart sensors. This standard provides a universal interface standard for smart sensors and various existing fieldbuses, which is beneficial for fieldbus based communication网络传感器Development and application.