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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(depending on minimum signal strength and power to reach the field devices) Device Addressing Automatic when connected to segment Governing Body Fieldbus Foundation Website Contents 1 Description 2 Parameters 3 Communication Methods 4 Use 5 Power Supply 6 Termination 7 Development 8 References 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. 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. Development This protocol was developed and is supported by Fieldbus Foundation References v · d · eList of automation protocols Process automation protocols DF-1  • FOUNDATION fieldbus ( H1, HSE)  • Profibus  • PROFINET IO  • CC-Link Industrial Networks  • CIP  • Controller area network  • ControlNet  • DeviceNet  • DirectNET  • EtherNet/IP  • Ethernet Powerlink  • EtherCAT  • Interbus  • HART Protocol  • Modbus  • Ethernet Global Data (EGD)  • FINS  • HostLink  • MECHATROLINK  • MelsecNet  • Optomux  • Honeywell SDS  • GE SRTP  • SERCOS interface  • SERCOS III  • Sinec H1  • SynqNet  • TTEthernet  • PieP  • BSAP Building automation protocols 1-Wire  • BACnet  • C-Bus  • DALI  • DSI  • Konnex  • LonTalk  • Modbus  • oBIX  • ZigBee  • xAP Substation automation protocols IEC 61850  • IEC 60870-5-101  • IEC 60870-5-104  • IEC 60870-5-103  • Modbus  • DNP3  • Profibus  • IEC 62351 Automatic meter reading protocols DLMS/IEC 62056 • ANSI C12.18  • IEC 61107  • Modbus • M-Bus  • ZigBee Smart Energy 2.0 Automobile / Vehicle protocol buses Local Interconnect Network  • Controller area network  • J1939  • FlexRay  • Media Oriented Systems Transport  • Keyword Protocol 2000  • Vehicle Area Network  • J1708 This computer networking article is a stub. You can help Wikipedia by expanding it.v · d · e