FD-875 (Rev 2025

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In the world of industrial automation and control systems, choosing the right signal standard for transmitting data is critical. While 0-10 V signals are simple and inexpensive, they are often replaced by 4-20 mA current loops or Foundation Fieldbus communication protocols in industrial settings.
For brevity, FOUNDATION Fieldbus will be abbreviated as FF throughout the rest of this chapter. This particular industrial network standard was first proposed as a concept in 1984, and officially standardized by the Fieldbus Foundation (the organization overseeing all FF standards and validation) in 1996.
A fieldbus is a member of a family of industrial digital communication networks used for real-time distributed control. Fieldbus profiles are standardized by the International Electrotechnical Commission (IEC) as IEC 61784/61158.
Foundation Fieldbus H1 - Operates at 31.25 kbit/s and is generally used to connect to field devices and host systems.
FOUNDATION fieldbus H1 segments require 9-32 volts DC power and approximately 15-20 mA of current per device. They operate at a communication speed of 31.25 kbaud.
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Fieldbus is a bidirectional communication protocol that provides real-time, closed-loop control between intelligent field instruments and host systems. A host can be any software application: from a technicians handheld device or laptop, to a plants process control, asset management, or safety system.
The transfer rate of 31.25 kbit/s allows for long cable paths and a high degree of resistance to electromagnetic interference.
The Foundation Fieldbus organization recommends that overall cable length be limited to 1900 m (6234 ft) per segment with spur lengths limited to 120 m (390 ft) for 12 or fewer devices.

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