Read a data type from Siemens PLC via OPC-UA

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1

Hello, We are testing to read both STRUCT types and PLC DATA TYPES (created by user) in a S7-1500 PLC. For the STRUCT everything works correctly, we can read the atomic STRUCT as json or import tag by tag. But for PLC DATA TYPES it seems that we can not read it (Bad), and no tags below are shown. PLC guy saids everything is correctly configured within the PLC...
Had someone the same problem?

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2

Can you give more detail what you mean by PLC DATA TYPES? Examples? Screenshots from TIA Portal?

3

Hello,

Yes, they are these types:

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And this is the example we are trying to read (64 bools):

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4

Can you read them from another OPC UA client like UaExpert?

The Bad_NotReadable StatusCode suggests this is the Server not allowing them to be read, not a problem on the Client side.

5

Yes, we tested with UaExpert and received the same error, not readble. Could it be some configuration of that data type in TIA Poratl?

6

It might be that the data type contains unreadable types.

A single unreadable member will cause the entire read to fail. I would have preferred the OPC UA server to simple omit that member.

IEC timers is one example that cause such a failure.

1 Like
7

Hello,

We have already solved the problem.
On the one hand "Active TypeDictionary" must be actived.

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and on the other hand in the DATA TYPES configuration the accesible colum must the actived.

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Thanks so much for your support.