Technical data

Relationship between the HDB SEND 210 call and DP polling list cycle
The information transferred to the output area of the CP with the HDB
SEND 210 call, is only transferred to the bus as allowed by the processing
of the DP polling list.
DP polling list processing
PLC program processing
CPU
CP 5430 TF/CP 5431 FMS
L2 bus
Call HDB SEND 210
(with data information "X")
Call HDB SEND 210
(with data information "A")
Call HDB SEND 210
(with data information "B")
Call HDB SEND 210
(with data information "C")
Call HDB SEND 210
(with data information "D")
Transmitted
data information "X"
Transmitted
data information "C"
DP polling list cycle n+2
DP polling list cycle n+1
DP polling list cycle n
Fig. 11.9 Relationship Between HDB SEND 210 Call and DP Polling List Cycle
B8976060/02 Distributed I/Os (DP)
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