Prosoft-technology MVI69-DNP Manual de usuario descargar pdf (Pagina 76)

MVI69-DNP ♦ CompactLogix or MicroLogix Platform Reference

DNP 3.0 Master/Slave Communication Module

Page 76 of 129 ProSoft Technology, Inc.

November 3, 2008

DATA TYPE START BLOCK # MAX BLOCK # MAX # OF POINTS

IED Digital Input 40 47 7680

IED Digital Output 48 55 7680

IED Counters 56 63 240

IED Analog Input 64 71 480

IED Analog Output 72 79 480

DNP Float Input 80 87 240

DNP Float Output 88 95 240

These blocks are mapped into a pre-defined memory area in the module.

Pointers into the memory area are computed by the application for each data

type. The application will only copy the portion of the block that contains valid

data.

Read Block

These blocks of data transfer information from the module to the CompactLogix

processor. The structure of the input image used to transfer this data is shown

below:

Offset Description

0 Read Block ID

1 Write Block ID

2 to 61 Read Data

The Read Block ID is an index value used to determine the location of where the

data will be placed in the CompactLogix processor controller tag array of module

read data. Each transfer can move up to 60 words (block offsets 0 to 61) of data.

The Write Block ID associated with the block requests data from the

CompactLogix processor. Under normal, program operation, the module

sequentially sends read blocks and requests write blocks. For example, if three

read and two write blocks are used with the application, the sequence will be as

follows:

R1W1

R2W2 R3W1 R1W2 R2W1 R3W2 R1W1

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 128 129

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Prosoft-technology MVI69-DNP Manual de usuario Pagina 76