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PROFIBUS-DPV1 functions
117
11/04 MN01219002Z-EN
Access to objects
Access to the Process Data Objects in the NZM-XDMI-DPV1
using the DPV1 Read and Write services is implemented with
the aid of the functions provided by the DP master system.
Please refer to the manufacturers documentation. Usually,
function blocks are provided for access. In IEC 61131-3
based systems, the “RDREC” (Read) and “WRREC” (Write)
function blocks which are defined by the Profibus User
Organization (PNO) in guideline 2.182 are often provided to
also ensure optimum access to complex data structures.
You require the following details to address the objects:
• The address of the local DPV1 master interface,
• The station address of the NZM-XDMI-DPV1 to be
contacted,
• The identifier of the application (API) in the
NZM-XDMI-DPV1 (specification only required with class 2
DPV1 master),
• The module of the NZM-XDMI-DPV1 (slot number) to be
addressed,
NZM-XDMI-DPV1
device identification
0
0
29
8
R
a
176
Object compilation
A
0
0
50
31
R
a
179
Object compilation
B
0
0
51
19
R
a
185
Object name
API
Slot
number
Index
Data
length
(Octets)
Readable
(R)
Writable
(W)
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