Foundation Fieldbus H1
Encyclopedia
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.
Using Half Duplex RS485 hardware connection the two wire communication is made possible.
The Foundation Fieldbus H1 has support for Intrinsically Safe Wiring with 4-6 devices per repeated segment depending on power requirements and other parameters.
The original concept was to connect as many as can be in forming a node,but limited by signal strength.
There is another level of protocol called HSE (for High-Speed Ethernet), catering to level 2 automation hierarchy.
FOUNDATION fieldbus
Foundation Fieldbus is an all-digital, serial, two-way communications system that serves as the base-level network in a plant or factory automation environment. It is an open architecture, developed and administered by the Fieldbus Foundation....
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.
Using Half Duplex RS485 hardware connection the two wire communication is made possible.
The Foundation Fieldbus H1 has support for Intrinsically Safe Wiring with 4-6 devices per repeated segment depending on power requirements and other parameters.
The original concept was to connect as many as can be in forming a node,but limited by signal strength.
There is another level of protocol called HSE (for High-Speed Ethernet), catering to level 2 automation hierarchy.
Parameters
The communication line can stretch 1900 meters without repeaters or 9500 meters with up to 4 allowed repeaters.Communication Methods
The communication methods supported are:- Client/Server
- Publisher/Subscriber
- Event
- Scheduled/Unscheduled
Use
This protocol is primarily used for analog and discrete process control devices.The primary advantage is configuration by functional block concept.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.Termination
The communication bus for this protocol requires two terminators (one near each end of the bus) in order to prevent signal reflections.See also
- Computer networkingComputer networkA computer network, often simply referred to as a network, is a collection of hardware components and computers interconnected by communication channels that allow sharing of resources and information....
- Computer scienceComputer scienceComputer science or computing science is the study of the theoretical foundations of information and computation and of practical techniques for their implementation and application in computer systems...