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OPCUA Read in Parallel

Background: I have two S7 PLCs that are connected in LAN from which I request to read data from LabVIEW using OPC UA toolkit. I could read the data correctly

 

Problem: I created preallocated clones of "Multiple Read" VI and tried to read them simultaneously. However when I check the communication with wireshark, it appears to be serial wherein the second request reaches the PLC only after first request is answered. I am unsure if I am actually making the request in parallel.

 

The LabVIEW PC's IP is 192.168.0.30 The PLCs end with 10 and 20

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