Property Transfer

Need to transfer data from an IEC61850 OPC network within 800xA, to the Control Network. I know i can do this with a property transfer definition, is there a better way to do it? or is that the preferred method. have had issues with property transfers working reliably in the past, generally use them as a last resort. it is my understanding that property translations cannot move data across networks? 800xa 5.1-4

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asked 7 months ago



I've written many answers on the Property Transfer (PT) service here on AKS, try searching for them.

PT can move data in any direction between any two OPC items in the address space of a system.

PT is often incorrectly put in focus when it comes to performance. The PT service can not perform better than the destination OPC server's ability to accept asynchronous writes.

Imaging filling up your lawn mower from a petrol can - unless you keep the rate of flow at or below the capacity of the funnel, you will spill. The spill is not the funnel's nor the lawn mower's fault, it is the person holding the petrol can.

As a system's engineer, you need to find out the maximum capacity of your destination OPC server and keep the pace of writes at or below.

A failed write may be retried at the cost of more writes

A cyclic scheduled write (write even if no change) will also add volume of writes.

The maximum capacity is difficult to gauge.

Work with the available settings (Update Rate, Retry Failed, Cyclic Rewrite and Min Time Between Writes) until you see no "Transaction overrun". Remember to test all running conditions (startup, shutdown, failover, etc). The last settings mentioned was added late in the 5.1 era.

Stefan Stromqvist   

answered 7 months ago


By BK_REIS on 7/4/2017 | Like (0) | Report

makes sense, thanks

By Harsha.D on 7/6/2017 | Like (1) | Report

You can use OPC datalink to transfer data between OPC servers.
But it needs separate licenses for PPOPC_P and PPOPC_R

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Cogent datahub can be utilized to transfer data from AC800M to IEC61850 OPC network. This has been done in a project before.


answered 7 months ago


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