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Robot Reference Interface (RRI) Huge communication Delay

Hello there,
I am looking for people that have worked with RRI.
I am currently sending one boolean to the Robot Controller from PLC and afterwards send the same data back to PLC from the controller.
Unfortunatelly the time between sending and receiving data is about 3-4 seconds!
Any help is very appreciated, as this setup allready was causing a lot of effort.
Many thanks in advance.
Bart