IS200SPROH1A
IS200SPROH1A
IS200SPROH1A
which is expected to become the mainstream product of control system in the 21st century. After the emergence of computer control system, sensors, transmitters and actuators in analog instrument system are widely used in engineering practice. The signal transmission is generally in the form of 4-20mA current signal. A transmitter or actuator needs a pair of transmission lines to transmit an analog signal in
one direction. This transmission method uses many wires, the field installation and debugging of the workload is large, high investment, transmission accuracy and anti-interference ability is low, inconvenient maintenance. The main control room staff can not understand the actual situation of the field instrument, can not adjust the parameters and fault diagnosis, so at the bottom of the simulation transmitter and the actuator has become the weakest link in the computer control system, namely the development bottleneck of the so-called DCS system. Fieldbus is born in this situation.
Fieldbus technology and its characteristics
The fieldbus technology is developed in the late 80 s the scene of an advanced industrial control technology, it combines digital communication technology, computer technology, automatic control technology, network technology and intelligent instruments such as a variety of technical means, fundamentally breaks through the traditional “point to point” the limitations of analog signal or a digital analog signal control, A
