Hi all,

Which CPU supports OPC-DA Client? For CPUs that do not support OPC-DA Client, is there any way to support it?

Thanks in advance.

Kind Regards

Ugo Fabrizi

Hello drugo85

What do you mean exactly with OPC -DA ?

Do you mean:

- OPC Data Access (DCOM based)? -> NO, as the name says, DCOM Based needs a Windows OS

To get access to a PLC with OPC DA (DCOM) you would need a PC Based OPC Server that accesses the PLCs with S7 communication like (LINK)

- OPC UA DA(DataAccess)-> S71500 Support a direct OPC UA Client on the Controller (LINK)

Bye Murof

Thanks a lot for your kind reply.

Basically some PLCs of the s7200/s7300/s7400 needs to talk with a kepware server in my understanding of the application.

What kind of protocol I can use to talk with Kepware server with these kind of PLCs?

S7 protocol put/get is supported?

Thanks in advance.

Best Regards

Ugo Fabrizi

Furthermore what if we substitute the PLCs to s1500 cpu 1515 what kind of protocol do you suggest to communicate with kepware server?

Regards

Ugo Fabrizi

I have this cryptic sentence on the specifications of a supplier of an automatic storage with LGVs and says:

E80 communicates withthe customer field devices through E80 SMILE which resides in the Virtual Machines provided by the customer. E80 provides and installs Kepware OPC server in the Virtual Machines which allows E80SMILE to read and write data to thecustomer PLCs through OPC DA protocol.

Can you help me decyphring it and understand it?

Thanks in advance.

Kind Regards

Ugo Fabrizi

Hello drugo85

so the classic PLCs do not have an integrated OPC Server/client, so you would need an OPc Server that can do S7 communication to get access to the PLC tags.

If you have S7-1500 then you can use OPC UA Server and Client directly on the Server.

If you have to access these PLCs from a OPC DA (DCOM based) Client then you can use this:

https://support.industry.siemens.com/cs/de/en/view/109474300

If you have only a OPC DA Server (and this Server can not directly communicate to the S7 Stations) then you will need something in the middle (some kind of OPC gateway)

Bye Murof