Functions
5.2 Acyclical data exchange
PROFIBUS with STEP 7 V13
74
Function Manual, 12/2014, A5E03775446-AC
5.2
Acyclical data exchange
Additional functionality with DPV1 devices (DP master/DP slaves)
DP masters and DP slaves that support DPV1 have the following additional functions
compared to the devices that support only DPV0:
●
The acyclic data exchange between master and slave is supported.
●
Interrupts can be set by a DPV1 slave which ensure handling of the interrupt-triggering
event in the master CPU.
Acyclic data exchange
Read/write data record, for example, to change the parameters of a slave during operation.
The data records of a module and the structure of these data records is available in the
documentation for the respective module.
The table below contains the instructions with their functions for access to DPV1 slaves.
Detailed information is available in the STEP 7 online help.
Table 5- 2
Instructions for access to DPV1 slaves
Instructions
Function (DPV1)
RDREC
Read data record
WRREC
Write data record
RALRM
Receive interrupt from a DP slave.
(The instruction must be called in the OB that triggers the interrupt.)
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