HMS A8NDPV1 Instruction Manual page 66

GX Works2 (Q-CPU) Simple Ladder Acyclic communication example
In the program there is a delay of 500ms between receiving confirmation of the write request,
and executing the read request. Due to the nature of Profidrive acyclic communication, the re-
sponse may not be immediately available after execution of the request. Waiting a small amount
of time significantly increases the chance of receiving a response on the first try. Another solution
is to keep executing read requests, until a proper read request is received.
Finally include the code that executes the prepared request:
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Doc.Id. HMSI-216-127
Doc.Rev. 1.01