Technical data

In the CYCLE-SYNCHRONIZED mode, you as user decide when the DP
input and output data is accepted or transferred by the CP by calling the
HDB checkpoints SEND 210/RECEIVE 211.
As can be seen in Figs. 11.9 and 11.10, in the CYCLE-SYNCHRONIZED
mode for DP, the processing of the DP polling list and the calls for the HDB
checkpoints (PLC cycle) are independent of each other.
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The processing of the DP polling list in the
CYCLE-SYNCHRONIZED mode is only started after the first
call of one of the HDB checkpoints (SEND 210/RECEIVE 211).
Distributed I/Os (DP) B89060/02
Volume 1 11 - 18