HMS A8NDPV1 Instruction Manual page 115

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To initiate the read request, set input REQ of function block RDREC. Enter state 4, and wait for the
BUSY output to turn off. Once this condition is met, enter state 5 to check the results of the read
request.
Expect to see either output DONE or ERROR of RDREC in an ON state. If DONE is ON, the read re-
quest was performed successfully, reset the REQ input, enter state 6 to process the response. If
the ERROR output is ON, check the STATUS output to read the error. If the status is equal to
0xDF80B500, the result is not yet ready. In this case, do nothing and wait for the actual result. In
every other case, save the status to tag readStatus and enter state 11, indicating that a read re-
quest error occurred.
A8NDPV1 PROFIBUS Option Board
TIA Portal Acyclic communication example
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