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slwstctt

SQL to PLC Communications, Where to go from here?

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I'm very new to PLCs and this sort of thing, so bear with me... Right now I have an SQL server that contains data that I want available on an Allen Bradley PLC. I've already gotten the connection into KepServer working and it generated the tags from the data. I'm able to access all of the data and use it fine with an OPC Client that's on the computer, but I'm unsure of where to go from here. I want these tags populated on the PLC via this OPC server and to remain updated. How do I get the PLC to grab these tags and do that now that they're available via OPC?

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Here's two ideas: 1. You can get an OPC server for the Allen Bradley PLC and map some of it's registers to tags in the OPC server. You can then bridge the OPC servers using a tool like Linkmaster from Kepware http://www.kepware.com/Products/products_linkmaster.asp Or, 2. if the PLC is a control logix type, you could always use a custom block from SQL4automation.com might be a more streamlined (and cheaper) solution. Good luck!

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