What are the common communication methods of TAS with field instruments?

One of the common communication methods used by a process automation system (TAS) to communicate with field instruments is through analog signals. Analog signals are widely used for transmitting measured process variables such as temperature, pressure, and flow rate. The field instruments, such as transmitters or sensors, convert these process variables into continuous electrical signals, which are then sent to the TAS through analog input cards. Another commonly employed communication method is called digital communication. This involves the use of protocols such as HART (Highway Addressable Remote Transducer) or Modbus to enable bi-directional communication between the TAS and field instruments. With digital communication, not only can the process variables be transmitted, but also diagnostic information and configuration commands can be exchanged, allowing for greater control and monitoring of the field instruments.

This mind map was published on 17 October 2023 and has been viewed 134 times.