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BUS COMPARISON MATRIX 2002 R.A. Hulsebos ([email protected])Only for personal use vendors & publishers contact me first for other usage!

Item Profibus AS-Interface Interbus Modbus-1 Ethernet

General

Abbreviation Process Field Bus Actuator Sensor Interface - Modicon Bus -Available since Ca. 1990 Ca. 1995 Ca. 1988 Ca. 1979. Ca. 1975Developer Profibus Consortium

(Germany)AS-Interface Consortium(Germany)

Phoenix (Germany) Modicon / Gould / GroupeSchneider

Xerox (US)

Standards DIN 19245, EN 13321/1(FMS), EN 50254/2, EN50170/2, IEC 61158 Type3, SEMI E54.8 (DP)

EN 50295, IEC 62026/2,IEC 947

DIN 19258, EN 50254/1,IEC 61158 Type 8

No (inter)nationalstandard.

IEEE 802.3

Website www.profibus.com www.as-interface.net www.interbusclub.com www.modbus.org

Variants FMS, PA, FDL, DP (withsubversions DP/E, DP/V1and DP/V2)

V1.0, V2.0, V2.10, V2.11and higher

V1, V2, V3, V4Interbus/Loop

ASCII, RTU (RemoteTerminal Unit)

10Base2 (Coax)10Base5 (Coax)10BaseT (Twisted-pair)100BaseTX (idem)

Other protocols whichresemble it

MPI (Multipoint Interface)from Siemens (like FDL)

- - The French Jbus is notofficially a Modbus-1variant, but for 99%compatible.

-

Applicable forsensor/actuator I/O?

No (too complex, andhardware too large)

Yes (especiallydeveloped for it)

Yes (via Interbus/Loop) No No (hardware too large)

Applicable for remoteI/O ?

Yes (DP only) Limited (can only have 4digital I/O channels or 2analog channels perparticipant)

Yes Yes Yes

Applicable forcommunication

between controllersand/or intelligentequipment?

Yes (FMS forcommunication between

controllers, PA for fieldinstruments)

No. Limited. Yes, but officially only forModicon / Groupe

Schneider controllers,although many othercontroller vendors alsosupport Modbus.

Yes

Most often used variantat this moment

DP/V1 V2.0 V4 RTU 10BaseT, 100BaseTX

Variants that are notused anymore or areseldom used

FDL, FMS V1.0 V1, V2 ASCII 10Base210Base5

Compatibility between FMS and DP and FDL Backwards compatible. Backwards compatible. Both variants have a Compatible by using hubs or switches


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Diagnostics at the node

level

Part standard diagnostics

bits (specified by DP),remainder is supplier-specific or profile-specific.

Presence; configured; in

use.

Periphery error. A diagnostic command is

specified, although veryoften it is not implemented.

None (handled by higher protocol

layers).

Vulnerabilities Nodes with terminatorsthat are removed orswitched off; short-circuiton the bus; dual use ofnetwork addresses.

Failure power-supply;dual use of networkaddresses (especiallyaddress 0).

Ring broken. Nodes with terminatorsthat are removed orswitched off; short-circuiton the bus; dual use ofnetwork addresses.

Failure of hub/switch (10BaseT,100BaseTX). Failure of power supply ofhub/switch.

Can I/O nodes beremoved from runningnetwork?

Yes; this is detected. Yes; this is detected. Yes; after switching offnode.

Yes; this is detected if themaster regularlycommunicates with thatnode (a timeout is theresult).

Yes. Detection depends on capabilitiesof higher protocol layers.

Can I/O nodes beconnected to a runningsystem?

Yes. If node wasconfigured earlier, it isactivated again.



Yes. Is possible when supported by higherprotocol layers.

What happens when anode is connected thatis not configured?

Ignored. Ignored, after beingreported to application.

Reported to application. Ignored. Depends on higher protocol layers.

Synchronous readingof inputs possible?

Yes; but only if supportedby supplier (is an optionin DP, not possible inFMS).

No. Yes (standard). - Is possible when supported by higherprotocol layers

Synchronous activationof outputs possible?

Yes; but only if supportedby supplier (is an option

in DP, not possible inFMS).

No. Yes (standard). - Is possible when supported by higherprotocol layers

16-May-2002

comparacion de buses de campo

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