Error reading S7-1500 DB through Kepware OPC

General Discussion
1

From a S7-1500 I have to read the bits of the last two bytes of a DB (bytes 3848, 3849). Ignition cannot read those bits: tag quality is Unknown. Going to the kepware log I see the following reading error:

Kepware_reading_error.JPG947×31 9.11 KB

It seems that Ignition is telling Kepware to read 3 bytes from 3848: is there any reason for that?
My bits are defined by using a UDT as follows (StartByte=3848):

Tag_definition.JPG747×523 55.6 KB

Any suggestion?

Thank you in advance

Regards

2

Is it possible that any of the other tags in your UDT are addressing past 3908?

3

Thank you Kevin. I’m quite sure that’s not the case: I double checked the tag database definition and all my variables are within DB addressable range - anyway I will check it again.

Regards