Siemens PLC Communication to ABB800xA
Ping only means that your Cable and IP adresses are OK. Nothing else.
ABB dont make a "Siemens" OPC Server, the 800xA system is only a client. You dont say where you Siemens OPC server is installed, what server you are using and whether that siemens server can see any data from the PLC.
Firstly test that the Siemens OPC server is getting data from the PLC. Use this test client ... https://advosol.com/pc-42-15-test-cli...
If the server isnt getting data then this isnt an 800xA problem. Talk to your Server supplier.
If the Siemens OPC server can get data from the PLC but you cannot see that data in 800xA, its probably OPC permissions and security related. OPC security problems can be awkward to solve. Use this security analyzer ... https://advosol.com/p-22-opc-security...