Siemens SIMATIC NET CP 5613 Manual page 61

Polling Productive Operation
The user program can access data in the process image but must be prepared to
process parameter and configuration frames. This is the case when the master
wants to include the slave module in data exchange (for example,when the master
starts up or after the bus connector has been removed and reinserted, ...). The
following sequence must be executed cyclically in a main program loop.
Step
1
2a
2b
3
4
Note
After positive confirmation of configuration data, the input data in the process
image table of the slave module must be written at least once (initialization), before
the slave module can change to data exchange.
DP Base Programming Interface for CP 5613/CP 5614
C79000-G8976-C108-02
Action
DPS_get_ind
If DPS_CHK_PRM:
DPS_set_resp
If DPS_CHK_CFG:
DPS_set_resp
Access to PI
(PI - P rocess I mage)
Go to Step 1.
Overview of the DP Base Interface
Meaning
Query whether indications have
arrived.
If a new parameter assignment has
arrived:
Check user parameter data and
Acknowledge positively or
negatively
If a new configuration has arrived:
Check configuration data and
Acknowledge positively or
negatively.
Read and write data in the process
image (access as necessary)
DPS_get_ind must be called cyclically.
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