opc server

Kepware with a ControlLogix: the Tag Import, the Arrays, and What Breaks

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Five boxes in a row from Studio 5000 through the import route, the server group and the server tag to the client item, with four numbered red points marking where each join fails

Automatic tag generation against one 1756-L83E produced 5537 server tags in about ninety seconds, and the clients on that site reference 684 of them. The other 4853 are array elements nobody reads, structure members nobody reads, and a full PID_ENHANCED nobody has looked at since commissioning. They cost project load time, they cost browse time … Read more

Kepware Channels, Devices and Tags: the Structure to Get Right Before the First Tag

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Five boxes in a row showing one value walking from the controller through the channel, the device, the tag group and the server tag, with four numbered red points below marking where the chain breaks

A SCADA client stores one string for every value it reads, and on the line I am about to describe that string is CLX_Line1.Bagger.Infeed.Belt1_Run. Four names, each chosen by a different person on a different day, and 684 more strings on that one device built the same way. Rename the tag group on a Friday … Read more

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