Field or fieldbus networks are computer network implementations for connecting control devices, such as PLCs, and devices on the workshop or field, such as sensors or actuators. In a typical scenario, sensors and actuators are connected to the controller either directly, through the input or output modules of its cabinet, or through a serial line from the remote input and output cabinets. Using a field network, however, such devices become the nodes of a computer network and so they must have some processing capacity to be able to communicate through the network.
These networks differ from the preceding networks because of the following points:
- They have very short messages that are exchanged frequently.
- They deliver the messages ...
