1.2. Aboutfieldbus

1.2. Aboutfieldbus

 

Fieldbus is an open industry standard for operating devices, including sensors, buttons, motor drivers and control interfaces, by connecting these devices to a PLC (Programmable Logic Controller) via a single cable.

 

Fieldbus provides intelligent services, such as monitoring the status of the whole network or reconstructing the whole network from the central host. For example, it has the advantage of being able to exchange information (operating mode setting, faulty sensor, etc.) in detail through sensors or switches.

As Fieldbus uses a single cable, the time and expense required for wiring can be reduced, and maintenance is made easier by the simplicity of the wiring formation. Also, unlike protocols with non-deterministic response characteristics such as Ethernet, the data response speed of fieldbus is secured, making it appropriate for industrial purposes where timing is critical.

 

 

Figure 1.1 Fieldbus network and master, slave devices

 

1 master device and various slave devices are connected in 1 Fieldbus network. The master device scans and controls the whole network, and exchanges data with slave devices. Generally, PLC is the master device, and the other sensors, buttons and controllers are slave devices.