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Problem with UDS OPC connecting to RSLinx OPC Server

Former Member
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We're experiencing issues with the response time for our OPC UDSs fetching data from RSLinx. The problem is that for each tag configured in UDS Admin the OPC UDSs subscribes to the RSLinx OPC server, retrieves the tag data, and promptly unsubscribes, which is unlike any other OPC client we've tried. Retrieving data from 30 tags takes roughly 150 seconds using the OPC UDS, while a regular OPC client does the same job in 200ms. Is there any configuration parameter available to modify this behaviour?

thanks

Lionel

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Answers (1)

Answers (1)

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Lionel,

What are your current RSLinx settings?

Also, keep a watch out on Service Marketplace as the new UDSes will be released in the near future. Once they are you should begin using them immediately.

Sam

Former Member
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The RSLinx is connected to a SLC500 with an ethernet module.

The DDE/OPC Topic Configuration is:

Processor Type: SLC503+

Polled Messages: 10 msec.

Unsolicited Messages: Send all unsolicited updates.

Communication time out: 5 sec.

Limit maximum packets: 200

Optimize poke packets

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Lionel,

The RSLinx configuration looks ok, do you have any messages in the Windows Event Viewer associated with the SAP UDS instance? What is the UDS configuration you are using?

Sam

Former Member
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I don't have any messagge in the Windows Event Vierwer associated with the SAP UDS instance. The configuration of the UDS is:

Datasource OPCConnector.Datasource

Port 8085

Debug False

OPCServerName RSLinx OPC Server

ReadDescriptions False

LookUpItemID True

CacheMode Alias

NamespaceBrowsing False

NamespacePathDelimiter .

BrowseMask *

BrowseMode Hierarchical

DemandLoadMetaData False

ReadMode Async

ReadDelay 0

ReadSource Device

AcceptableDataQuality Good

Synchronize False

Any suggestions?

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Lionel,

Yes, change the ReadSource to Cache...

Also you will want to change the BrowseMode to Flat...

Hope this helps.

Sam