I am having an issue trying to read the tags from a PLC S7-1500.
I have access level set as “Full access (no protection” and the connection mechanism enabled for “permit access with PUT/GET communications from remote partner”.
Well… the error 8104 means that access to the address is not allowed. So there must be something with the “Permit access with PUT/GET…” in the HW configuration of the PLC.
Can you try to compile the PLC program again and download it to the PLC?
Is this (STRING) the only tag you can’t read?