Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 60)

Communication
3.4 DPV1
CPU 31xC and CPU 31x, Technical data
3-32
Manual, Edition 08/2004, A5E00105475-05
3.4 DPV1
New automation and process engineering tasks require the range of functions performed by
the existing DP protocol to be extended. In addition to cyclical communication functions,
acyclical access to non-S7 field devices is another important requirement of our customers,
and was implemented in the standard EN 50170. In the past, acyclical access was only
possible with S7 slaves. The distributed I/O standard EN 50170 has been further developed.
All the changes concerning new DPV1 functions are included in IEC 61158/ EN 50170,
volume 2, PROFIBUS.
Definition DPV1
The term DPV1 is defined as a functional extension of the acyclical services (to include new
interrupts, for example) provided by the DP protocol.
Availability
All CPUs with DP interface(s) and serving as DP masters feature the enhanced DPV1
functionality.
Note
If you want to use the CPU as an intelligent slave, remember that it does not have DPV1
functionality.
Requirement for using the DPV1 functionality with DP slaves
For DPV1 slaves from other vendors, you will need a GSD file conforming to EN 50170,
revision 3 or later.
Extended functions of DPV1
• Use of any DPV1 slaves from external vendors (in addition to the existing DPV0 and
S7 slaves, of course).
• Selective handling of DPV1-specific interrupt events by new interrupt blocks.
• Reading/writing SFBs that conform to standards to the data record (although this can only
be used for centralized modules).
• User-friendly SFB for reading diagnostics.