Property Transfer Write From FD to PLC
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It is possible to use Property Transfer in any direction between two OPC servers that accept writing.
Put the PT aspect on the destination object, select property to write to and finally write an expression to read some property from the source.
Just keep in mind that the reliability of a PT is "low" and that the destination OPC server is often the bottleneck.
Keep a close watch on the System Event and Operator Message lists located at the [Workplace Structure]Web System Workplace object.
Fight overruns and failed writes with increasing the Update Rate on the PT. Later xA versions allow "Retry on failed write" and "Transfer of last known value without having received an update from the source". Use these options with caution, if destination is weak, increasing the number of writes is probably contra productive.
Obviously, do not use PT for protection, interlocks, etc. and other important signalling where a loss of contact could lead to damaged machinery, property or human life.
At first: what system we are talking about?
"PLC Connect" reminds me to 800xA with 3rd party PLC hardware. Correct?
800xA is an open system and you can do nearly EVERYTHING. The question is how deep you want to grip in your toolbox, how many knowledge and how many time you have.
You say you transfer values from PLC Connect to an function diagram. Is "function diagram" just the internal trend display? If yes there is no easy way to write trend data back to a property. If "function diagram" is an external tool like excel, so it uses an common interface - maybe the surrogate opc server, or some 800xA activex controls. In this case it should be possible to use the "read" interface to "write" too.
All PLC systems i know have some kind of function generators too. Are you sure your PLC system have no function generator? Or does this one not match your requirements?
After all, everythig i say is speculation. We need more information about your system, and what you exactly want to do.