access plc on client machine from a server connected plc

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Dear engineers and software developers.
my name is Jan Makopa. I am at a critical stage in the development of a HMI software.
problem statement;
at this stage, i am designing an interface were a user can select the type of station which the development pc is going to
be.
if the user selects "operator station" then the pc will not be configured any plc drivers.instead the pc will access data from a server connected to plc.
i dont know how i can access e plc nodes on the server.is there an easy way i can access the data frm a server
thank you in advance

Posted 30-Dec-14 5:35am

PCOMM Engineering

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**Zoltán Zörgő** · Answer 1 · 2014-12-30T11:46:00

Sorry, but there is no general method for that. The connection of the server to the PLC is not running on OS level. It is managed by SCADA server applications using different drivers for different PLC manufactures. TAGSs are registered for the different DB fields on the PLC. But the SCADA most likely won't expose these interfaces directly, so you have little chances to access PLC DB's via a SCADA - and there are many of them out there, thus even if some have such interfaces, won't be standard. You might not have any SCADA polling the PLC, you might have a custom application there. The best option is when you have an OPC server polling the PLCs since as that is hiding the drivers and will present a common interface you can use - see: https://opcfoundation.org/products/view/86[^].