Foundation Fieldbus, a digital protocol enables two-way communication between field devices and control system. It also simplifies startup and configuration as well as allows access to diagnostic data, which can save money and time.

So we can support a new application or even an entire plant using this technology. Let’s now take a look at how it works and its two types, FOUNDATION Fieldbus H1 and HSE level. Both networks offer the same benefits, but they each have specific uses, so that’s the difference.

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FOUNDATION Fieldbus H1 vs HSE level


FOUNDATION Fieldbus H1 operates at 31.25 kilobits per second and typically connects the field devices and host systems. It provides communication and power over the same cables and will work in conventional and intrinsic safety applications.


On the other hand, the FOUNDATION Fieldbus HSE (High-Speed Ethernet)  operates at 100/1000 megabits per second and connects the host systems, linking devices, input and output subsystem, and gateways. It usually won’t allow power over the cable, although FOUNDATION Fieldbus has begun work on a Power over Ethernet (PoE) standard.

How to connect H1 to HSE?

We call the connection between H1 and HSE a bridge; this application creates a standard network topology that you can see here:

The bridges connect the H1 network to the high-speed Ethernet, converting data telegrams and data transfer rates depending on the direction of the transmission.

To know more about Foundation Fieldbus, you can read our article on FOUNDATION Fieldbus vs HART 


Today, FOUNDATION Fieldbus has to fight for its spot in a new application against newer protocols that have begun popping up in the automation world. However, the protocol still brings a lot of benefits and unique features that can improve your process control.

To know more about FOUNDATION Fieldbus, you can get in touch with our engineers!

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