Foundation Fieldbus H1
From Wikipedia, the free encyclopedia
| Foundation Fieldbus H1 | ||
|---|---|---|
| Protocol Information | ||
| Type of Network | Process Control | |
| Physical Media | Twisted Pair, fiber | |
| Network Topology | Star, Bus | |
| Maximum Devices | 32 nodes/segment | |
| Maximum Distance | 9500 meters with 4 repeaters | |
| Device Addressing | Automatic when connected to segment | |
| Governing Body | Fieldbus Foundation | |
| Website | www.fieldbus.org | |
Contents |
[edit] Description
Foundation Fieldbus H1 is one of the Foundation Fieldbus protocol versions. It utilises either twisted pair, or fiber media to communicate between multiple nodes (devices) and the controller. The controller requires only one communication point to communicate with up to 32 nodes, this is a drastic improvement over the standard 4-20mA communication method which required a separate communication point for each communication device on the controller system.
The Foundation Fieldbus H1 has support for Intrinsically Safe Wiring with 4-6 devices per repeated segment depending on power requirements and other parameters.
[edit] Parameters
The communication line can stretch 1900 meters without repeaters or 9500 meters with up to 4 allowed repeaters.
[edit] Communication Methods
The communication methods supported are:
- Client/Server
- Publisher/Subscriber
- Event
- Scheduled/Unscheduled
[edit] Use
This protocol is primarily used for analog and discrete process control devices.
[edit] Power Supply
The big advantage of Foundation Fieldbus is that it allows power to be transferred over the communication bus to the controlled devices, this requires a Foundation Fieldbus power supply.
[edit] Termination
The communication bus in for this protocol requires two terminators one near each end of the bus.
[edit] Development
This protocol was developed and is supported by Fieldbus Foundation
