Prosoft-technology MVI69-DNP Bedienungsanleitung PDF herunterladen (Seite 44)

MVI69-DNP ♦ CompactLogix or MicroLogix Platform Ladder Logic

DNP 3.0 Master/Slave Communication Module

Page 44 of 129 ProSoft Technology, Inc.

November 3, 2008

3.1.3 DNPBackplane Object

The DNPBackplane object stores the variables required for backplane data

transfer between the module and the processor. The structure of the object is

displayed in the following example:

Tag Name Data Type Description

LastRead INT Index of last read block

LastWrite INT Index of last write block

BlockIndex INT Computed block offset for data table

3.1.4 DNPData Object

The DNPData object stores all the data for an MVI69-DNP module. This includes

the data to interface with the DNP slave port (DNP data set) and the DNP master

port (IED data set). Contained within the object is an array for each data type that

can exist for each of the two data sets. The array sizes are set to match the

configuration set for the module. If multiple MVI69-DNP modules are used within

a rack, a copy of this structure may have to be made to permit each module to

have its own database sizes. Ladder logic is required to transfer the data in this

structure between the module and the processor. Each data type has its own set

of unique block identification codes to distinguish the data contained in the read

or write block.

The structure of the object is shown in the following example:

Tag Name Data Type Description

DNP_BI INT[480] Number of DNP BI data words

DNP_BO INT[480] Number of DNP BO data words

DNP_Cntr DINT[240] Number of DNP counter double-words

DNP_AI INT[480] Number of DNP AI data words

DNP_FLTI REAL[240]

DNP_AO INT[480] Number of DNP AO data words

DNP_FLTO REAL[240]

IED_BI INT[480] Number of IED BI data words

IED_BO INT[480] Number of IED BO data words

IED_Cntr DINT[240] Number of IED counter double-wods

IED_AI INT[480] Number of IED AI data words

IED_AO INT[480] Number of IED AO data words

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Prosoft-technology MVI69-DNP Bedienungsanleitung Seite 44