Bronkhorst DeviceNet slave interface Uživatelský manuál stáhnout pdf (Strana 10)

BRONKHORST®

Page10DeviceNetinterface   9.17.026

Thedistancebetweenanytwopointsmustnotexceedthemaximumcabledistanceallowedforthedatarateused.

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Datarate

Maximumdistance

(flatcable)

Maximum distance

(thickcable)

Maximum distance

(midcable)

Maximumdistance

(thincable)

125kbit/s 420m 500m 300m 100m

250kbit/s 200m 250m 250m 100m

500kbit/s 75m 100m 100m 100m

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2.5 DROPLINESWITHDEVICENET

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Thecumulativedroplinelengthreferstothesumofalldroplines,thick,thin,ormidcable,inthecablesystem.This

sumcannotexceedthemaximumcumulativelengthallowedforthedatarateused.

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Datarate Cumulativedroplinelength

125kbit/s 156m

250kbit/s 78m

500kbit/s 39m

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Themaximumcabledistancefromanydeviceonabranchingdroplinetothetrunklineis6m.

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2.6 NETWORKTERMINATION

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Youmustterminatethetrunklineatbothendswith121Ohms,1%,1/4Wterminatingresistors.

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2.7 POWERSUPPLY

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Thecablesystemrequiresthepowersupplytohavearisetimeoflessthan250millisecondstowithin5%ofitsrated

outputvoltage.Youshouldverifythefollowing:

 Thepowersupplyhasitsowncurrentlimitprotection

 Fuseprotectionisprovidedforeachsegmentofthe

cablesystem

 Anysectionleadingawayfromapowersupplymusthaveprotection

 Thepowersupplyissizedcorrectlytoprovideeachdevicewithits

 Requiredpower

 De‐ratethesupplyfortemperatureusingthemanufacturer’sguidelines

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UsethepowersupplytopowertheDeviceNetcablesystemonly.Ifadevicerequiresaseparate24V

powersourceotherthantheDeviceNetpowersource,youshoulduseanadditional24Vpowersource.

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ChoosingaPowerSupply

Thetotalofallofthefollowingfactorsmustnotexceed3.25%ofthenominal24VneededforaDeviceNetsystem.

initialpowersupplysetting 1.00%

lineregulation 0.30%

temperaturedrift(total) 0.60%

timedrift 1.05%

loadregulation 0.30%

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Themaximumcabledistanceisnotnecessarilythetrunklengthonly.Itisthemaximumdistance

betweenanytwodevices.

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