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App.-56

IM 01R01A01-01E 9th Edition : May 31, 2013-00

AppendixI HowtoclearVCR(NI-FBUS

only)

 Outline

AlthoughFieldMatehasadoptedNI-FBUScommunicationcardofNationalInstrumentfor

FOUNDATIONeldbusH1,thecommunicationcarditselfcontainsthefollowingglitches.

Ifthespecicoperationcontinues,VCR,FOUNDATIONeldbusH1communicationresources,

mayreachthemaximumlimit(100)eventuallycommunicationwithFOUNDATIONeldbusH1

device cannont be established thereafter.

Note:thespecicoperation

AfterstartingNI-FBUSCommunicationsManager,PCisofforstand-by(notshutdown)andstart

again.ThenchangetheFOUNDATIONeldbusH1segmentconnection.

Iftheproblemaboveisencountered,clearVCRofNI-FBUScardbythistoolincorporatedin

FieldMate.

 VCR (Virtual Communication Relationship)

A Fieldbus device has many VCRs so that it can communicate with various devices or

applications at the same time. It is possible because the VCR guarantees the message goes

tothecorrectpartnerwithoutrisksoflosinginformation.AVCRisidentiedbyanapplication

withdevice-localidentiercalled“index”speciedinApplicationLayer.Itisalsoidentiedfrom

otherdeviceswithDL-addressspeciedinDataLinkLayer.AVCRhasaqueue(fast-in,fast-out

memory) or a buffer (memory to store data) to save messages.

ItistheresponsibilityofnetworkcongurationtogivethecorrectinformationoftheindexandDL-

address as well as other operating information to VCRs through Network Management.

 Screen

App.I01E.ai

It displays the port overview of NI-FBUS

card installed in PC. Max first index No,

used VCR, unused VCR.

Effective in 2 port type

Clear VCR

Exit thetool

Max VCR is displayed. The current NI-

FBUS card always shows 100.

The used VCR is displayed

Max 100.

The first Index No of unused VCR is

displayed.

The port overview of NI-FBUS card is displayed.

NI-FBUS with a port displays one.

Figure App.-I-1 FM NIFBUS Clear

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