Technical data

➣
If you have selected the CYCLE-SYNCHRONIZED update mode, the
complete ZP should be received at the end of a start-up OB
The SEND synchronization point is indicated by the SEND-HDB (ANR 210).
The parameter QTYP must be assigned the value "NN". DBNR, QANF,
QLAE are irrelevant. The ANZW should be assigned to a data or flag word.
The RECEIVE synchronization point is indicated by the RECEIVE HDB in
the "direct mode" and ANR 211. The remaining assignment of parameters
to the HDBs is the same as for the SEND synchronization point.
The following figure (Fig. 10.6) illustrates one way of integrating the HDBs
in the cold or warm restart branch of the PLC.
(OB 20, OB21, OB 22)
With this HDB call (job number
202), the station list is read in
by the CP 5430 TF.
The station list contains the
statuses of the CPs of all slaves
addressed by the ZP.
HDB SYNCHRON call
for the SSNR of the CP 5430 TF
yes
ZP of
stations
1and 2 ok?
no
end
Evaluation of the station list
i.e. interrogation of the statuses
of all slaves which must have
started up.
HDB RECEIVE call with
ANR 211
HDB RECEIVE call with
ANR 202
This HDB call (job number 211)
causes the ZP to be received
the first time, i.e. the inputs and
station list are updated. (only
required in CYCLE-SYNCHR.
mode).
Fig. 10.6: HDBs in Cold or Warm Restart of the PLC
B8976060/02 Communication with Cyclic I/Os
10 - 13 Volume 1