Hi Vishnuprasad Prachandabhanu,
The problem might be, that your fieldbus is not running when you are trying to access the RT-data. After you installed your snap you have to switch back into operating mode, so your fieldbus (EtherCAT) gets switched into "Running".
Please have a look into this Post. This blog-poster had a similar problem. (Note: but you don't have to deactivate the watchdog since you don't run in sync with the scheduler)
Best regards,
Nick
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