CHAPTER B Fieldbus Protocols

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Fieldbus requirements able to handle very short frames efficiently able to handle both periodic and aperiodic

traffic bounded response time no single point of failure error detection without retransmission or

correction short geographical scope with a limited

number of i/o’s low cost

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Classification

sensorbus devicebus fieldbus

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Fieldbus protocols Profibus WorldFIP Foundation Fieldbus Interbus-S DeviceNet CAN LonWorks SERCOS

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B.1 Fieldbus Architecture

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B.2 Profibus PROcess FIeldBUS DIN 19245 FMS (Fieldbus Message Specification) DP (Distributed Peripheral) PA (Process Automation)

32 stations per segment 9.6, 19.2, 93.75 kbps for segment length

less than 1200 m

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Medium access control token passing among master stations on

list of active station (LAS) transmission from slave stations only by

master station’s polling

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Priority mechanism

two priority classes: high and low TTR: target rotation time TRR: real rotation time TTH: token holding time, TTH =TTR - TRR

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at least one high priority message per token reception regardless of TTH

additional high priority messages only if TTH is still positive

low priority messages after high priority message transmission if TTH is still positive

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Fieldbus Message Specification (FMS)

application layer program invocation management variable access event management context management (connection

establishment) virtual fieldbus device object object dictionary management

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B.3 WorldFIP Field Instrumentation Protocol

French standard network configuration and transmission

speed

32 stations per segment up to 256 stations 31.25 kbps, 1Mbps, 2.5 Mbps

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Medium access control centralized polling bus arbitrator producer-consumer model bus arbitrator transmitting an ID frame for a

certain pair of producer and consumers

elementary cycle with a period equal to that of most frequent message

aperiodic variable and message exchange after periodic data transmission

filling for excess time

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B.4 표준화 동향 IEC 61158 Fieldbus standard for use in

industrial control systems (IEC/SC/65C) Type 1: IEC Fieldbus Technical Specifications Type 2: Control Net Type 3: Profibus Type 4: Pnet Type 5: HSE of the Fieldbus Foundation Type 6: SwiftNet Type 7: WorldFip Type 8: Interbus

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표준화 동향 II IEC 61784-1 Digital data communications for measurement

and control, Part 1: Profile sets for continuous and discrete manufacturing relative to fieldbus use in industrial control systems

set of communication profiles based on IEC 61158 to correctly state the compliance to IEC 61158 to avoid divergent implementations

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Communication Profile Family CPF 1: Foundation Fieldbus CPF 2: ControlNet, EtherNet/IP, DeviceNet CPF 3: PROFIBUS DP, PA, Profinet CPF 4: P-NET CPF 5: WorldFIP CPF 6: INTERBUS CPF 7: SwiftNet (dropped)

CPF 8: CC-Link CPF 9: HART CPF 10: Vnet/IP CPF 11: TCnet CPF 12: EtherCAT CPF 13: Ethernet Powerlink CPF 14: EPA CPF 15: MODBUS CPF 16: SERCOS

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표준화 동향 II ISO 15745 Industrial automation systems

and integration - Open systems application integration frameworks (TC 184 SC5) Part 2: ISO 11898 based control systems DeviceNet, CANKingdom, CANOpen

Part 3: IEC 61158-based control systems P-Net, Profibus, WorldFIP, ControlNet,

Interbus Part 4: Ethernet-based control systems Ethernet/IP, ADS-net, FL-net, Profinet,

Modbus TCP, EtherCAT, Ethernet Powerlink

Part 5: HDLC-based control systems

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표준화 동향 III SEMI (Semiconductor Equipment and Materials

International) Sensor/actuator network standards DeviceNet SDS(Smart Distributed System) LonWorks Seriplex Profibus-DP Modbus/TCP over TCP/IP CC-Link Ethernet/IP

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표준화 동향 IV 국내 필드버스 관련 단체 Profibus 협회 ODVA Interbus 협회 CC-Link 협회

한국자동화표준시스템연구조합 ISO TC184 SC5 WG5 간사기관 IEC SC 65C 간사기관