Seek help on setting up an OPC UA tag connection to access data within DB in Siemens S7-300 PLC

Ignition
1

Hi folks,

I am trying to establish a tag connection to access some data within a S7- 300 DB, and no success in getting it to work. It seems none of the syntax listed in the document here (Siemens Enhanced Driver | Ignition User Manual) would never work for me… e.g. DB202.DBX24, DB202.X24.0, DB202.24, DB202.DBREAL24.

Anybody has some insight to share? Would appreciate your help and thanks in advance.

HW

2

This isn't the syntax described in the manual... this is: DB202,X24.0

Have you just got the wrong syntax or have you actually tried that as well?

3

Thanks Kevin for your quick response.

I tested both cases, i.e. with a period sign AND with a comma as the separator as you mentioned here. Unfortunately, the results are the same. The diagnostics message is here: Error("CreateMonitoredItems failed: Bad_NodeIdUnknown: The node id refers to a node that does not exist in the server address space.")

FYI, accessing to the input and output points in the same PLC works fine.

4

image
image1285×857 42.2 KB

I made a screen shot of the manual page fyi.

5

Ah, are you actually using the new Siemens Enhanced driver, or the old one?

6

Hi Kevin, I’ve used the new one, rev 8.3. Figured out that the appropriate syntax should be DB202, REAL24. Tested ok. Thank you again for your help. Have a great weekend.

7

The syntaxes with the period should work with the Siemens Enhanced Driver. Are you sure you are not using the S7-300 driver?