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TN_107516704-Participant
4-Participant
July 23, 2026
Question

Read tags from kepware OPC UA server on s7 1500

  • July 23, 2026
  • 1 reply
  • 38 views

Hi. I want to use my s7 1500 as an OPC UA client over online connection. I am able to browse all OPC UA server tags, but I still can’t read the values. Note that I used OPC UA readlist instruction and the status is false for error, done or busy and the status itself shows 16#0070_0000.

Please, assist me on what I might be doing wrong.

1 reply

M
MRohillaCommunity Manager
Support
August 3, 2026

greetings ​@TN_10751670,

Since you can browse the Kepware OPC UA server, connectivity is likely working. The status 16#0070_0000 is typically an idle/no-action state rather than a read error, meaning the OPC_UA_ReadList request is not actually being executed.

Please verify:

REQ receives a rising edge and BUSY briefly goes TRUE.

A valid Connection Handle and Node Handle(s) have been obtained before calling OPC_UA_ReadList.

The correct NodeIds/namespace indexes are being used.

Kepware tag permissions allow read access.

If possible, Kindly raise a ticket at Kepware portal and share a screenshot of the OPC_UA_ReadList call (inputs/outputs) and the Node Handle configuration so we can help identify the issue more precisely.

Regards,

Mohit

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