Prosoft-technology MVI69-DNPSNET Manuel d'utilisateur télécharger pdf (Page 78)

MVI69-DNPSNET ♦ CompactLogix or MicroLogix Platform Reference

Distributed Network Protocol Interface Module

Page 78 of 119 ProSoft Technology, Inc.

November 3, 2008

Cold Boot

This block is sent from the CompactLogix processor to the module (output

image) when the module is required to perform the cold boot (hardware reset)

operation. This block is sent to the module when a hardware problem is detected

by the ladder logic that requires a hardware reset. The structure of the control

block is shown in the following table.

Offset Description Length

0 9999 1

1 to n Spare n

Data Flow Between MVI69-DNPSNET Module and the CompactLogix or

MicroLogix Processor

The following topics describe the flow of data between the two pieces of

hardware (CompactLogix or MicroLogix processor and MVI69-DNPSNET

module) and other nodes on the DNP network. The DNP Server Driver allows the

MVI69-DNPSNET module to respond to data read and write commands issued

by a master on the DNP network. The following flow chart and associated table

describe the flow of data into and out of the module.

Step Description

The configuration information for the module is retrieved from the DNPSNET.CFG file on

the Compact Flash Disk. This information configures the module and define the Ethernet

node characteristics.

A Host device (DNP Master unit) issues a read or write command to the module's node

address. The driver qualifies the message before accepting it into the module.

After the module accepts the command, the data is immediately transferred to or from

the appropriate internal database in the module. If the command is a read command, the

data is read out of the database and a response message is built. If the command is a

write command, the data is written directly into the database and a response message is

built.

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Prosoft-technology MVI69-DNPSNET Manuel d'utilisateur Page 78