IS200TTRUH1C
IS200TTRUH1C
IS200TTRUH1C
distributed control system from this point of view is essentially a closed and special, not interoperable distributed control system and DCS cost is expensive. In this case, the users of the network control system to open and reduce the cost of urgent requirements.
4. Fieldbus control system (FCS) : FCS is born in accordance with the above trend, it uses fieldbus this open, with interoperable network will be the field controller and instrument equipment interconnection, constitute fieldbus control system, at the same time the control function is completely down to the site, reduce the installation cost and maintenance cost. Therefore, FCS is essentially an open, interoperable, completely decentralized distributed control system, 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 bottlene
