GE VersaPoint IC220PBI002, Руководство пользователя

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GFK-1911B Chapter 2 The Profibus NIU 2-11
2
DPV1 Communications for Profibus NIU IC220PBI002
If the DP/V 1 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/V
1 communications with the master.
DP/V 1 expands the cyclic data exchange function according to IEC 6 11 58 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/V
1 from the
master, and provides them to the specified modules in the I/O Station. The NIU
converts data from the modules into DP/V
1 telegrams for the Profibus master.
Masters with DP/V 1 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 Performs a DPV 1 read request from a slave device
(such as the Profibus NIU).
DPV1 Write Request Performs a DPV 1 write request to a slave device.
DPV1 Alarm Request Acknowledges a DPV 1 alarm request.