Hi @Hoser (Customer)​ 

PLC-499 Error Code 0x8104

https://www.automationdirect.com/microsites/c-more/software-help/Content/064.htm

This PLC error indicates that access to the address is not allowed. So there are a few things you can check:

1) Do the requested addresses exist?

2) With the Siemens S7-1200/1500, “Permit access with PUT/GET communication from the remote partner” needs to be enabled.

Regards,

Garry

https://accautomation.ca/series/c-more-hmi-series-panel/

The following information was found here:

http://snap7.sourceforge.net/snap7_client.html

"Particularly to access a DB in S71500 some additional setting plc-side are needed.

1. Only global DBs can be accessed.
2. The optimized block access must be turned off.
3. The access level must be “full” and the “connection mechanism” must allow GET/PUT."

Hopefully this helps.

My block is Global

Optimized block access is not checked

DB accessible from OPC UA is checked

Access level is set to Full

Permit access with PUT/GET Communication from remote partner is checked

Exactly how I'm set, no joy.

Hoser

I believe your next steps are going to be:

1) CREATE A SIMPLE TEST PROJECT:

Create a single numeric display object using an internal 16-bit register (e.g., MW0) and test communications.

2) SHARE PROJECTS:

Share your simple test projects (HMI and PLC) so that others in the Community can evaluate and help you.

3) CONTACT SIEMENS SUPPORT

Since the error you are seeing is generated by the PLC, you might need to contact Siemens and discuss the various access settings you've discussed here and see if there are any other settings within the PLC project that would inhibit external access.