Dpv1 Communications For Profibus Niu Ic220Pbi002 - GE VersaPoint IC220PBI002 User Manual

DPV1 Communications for Profibus NIU IC220PBI002

If the DP/V1 communications features of Profibus NIU IC220PBI002 are enabled
by configuration and if DIP switch 8 on the module is set to the On position, the
NIU supports enhanced DP/V1 communications with the master.
DP/V1 expands the cyclic data exchange function according to IEC 61158 to
include acyclic services. This makes it easy to operate even complex devices.
The Profibus NIU prepares the data records, which are sent via DP/V1 from the
master, and provides them to the specified modules in the I/O Station. The NIU
converts data from the modules into DP/V1 telegrams for the Profibus master.
Masters with DP/V1 ability include the PACSystems RX3i Profibus Master Module,
IC695PBM300, and the Series 90-30 CPU model IC693CPU366. Both of these
masters can use three types of COMMREQ (Communications Request) functions
in the application program to communicate with the Profibus NIU:
DPV1 Read Request
DPV1 Write Request
DPV1 Alarm Request
GFK-1911B Chapter 2 The Profibus NIU
Performs a DPV1 read request from a slave device
(such as the Profibus NIU).
Performs a DPV1 write request to a slave device.
Acknowledges a DPV1 alarm request.
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