Prosoft-technology MVI69-DNPSNET Manuale Utente Scaricare il pdf (Pagina 39)

Ladder Logic MVI69-DNPSNET ♦ CompactLogix or MicroLogix Platform

Distributed Network Protocol Interface Module

ProSoft Technology, Inc. Page 39 of 119

November 3, 2008

Name Data Type Description

UDP_ST_Value INT UDP Socket State Value

Busywithmsg INT DNP Busy with Message State

App_Fragm INT Application fragment

Tx_frame_ST INT Transmit frame State

TCP_msg_len INT TCP message length

UDP_msg_len INT UDP message length

Port_Tx_St INT Port Transmit state

Free_Mem DINT Free Memory

This information is important as it can be used to view the "health" of the module.

If the module is not communicating, examine the object to help find the problem.

Additionally, you should use the configuration/debug port on the module to

confirm that the desired configuration of the module is implemented.

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:

Name Data Type Description

BlockTransferSize INT

LastRead INT Index of last read block

LastWrite INT Index of last write block

BlockIndex INT Computed block offset for data table

ReadData INT[240] Buffer File for data Read from Module

WriteData INT[240] Buffer File for data Write from Module.

3.1.2 DNPData Object

The DNPData object stores all the data for an MVI69-DNPSNET module.

Contained within the object is an array for each data type. The array sizes are set

to match the configuration set for the module. If multiple MVI69-DNPSNET

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. The

structure of the object is shown in the following example:

Name Data Type Description

DNP_BI INT[20] Number of DNP BI data words

DNP_AI INT[40] Number of DNP AI data words

DNP_FLTI REAL[20] Number of DNP Float Input Points

DNP_Cntr DINT[10] Number of DNP counter double-words

DNP_BO INT[40] Number of DNP BO data words

DNP_AO INT[40] Number of DNP AO data words

DNP_FLTO REAL[20] Number of DNP Float Output points

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 118 119

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