Ns=2;s= in front of OPC Item Path?

Ignition
1

Hi,

I set up a OPC-UA type connection in Ignition to connect to KEPServer EX V6. The previous configuration is OPC-DA COM connection to KEPServer EX V5.

However, now all the OPC tags need to have “ns=2;s=” as a prefix of their OPC Item Paths. The OPC tags would have “Config Error” without this prefix.

Has anyone encountered this and know what “ns=2;s=” mean? The Ignition version I’m using is 7.9.4.

Thanks!
JT

2

When an OPC tag belongs to an OPC UA connection, the OPC Item Path is specifying the NodeId.

That prefix specifies the namespace index a NodeId belongs to.

For weird historical reasons, we assume ns=1 if it’s not explicitly present. Kepware’s Nodes are all in ns=2, so, it must be specified.

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