Compared with a traditional 4-20 mA loop, what is a key benefit of using Fieldbus protocols?

• A. Digital communication and multi-drop topology.
• B. Requires more wiring.
• C. Lacks diagnostics.
• D. Increases latency.

Answer: (A)

Digital communication replaces the analog loop, letting many devices be addressed and exchange data on a single fieldbus. With a multi-drop topology, several instruments, sensors, and controllers share the same bus, which reduces wiring and simplifies network maintenance. This combination provides richer information flow—status, diagnostics, and configuration data—across all devices on the network. That’s why the best choice highlights digital communication and a shared bus. The other options don’t fit: fieldbus does not require more wiring, it typically adds diagnostics, and while there may be some communication overhead, it isn’t defined by an inherent increase in latency.