Prosoft-technology MVI69-ADM Manual de usuario descargar pdf (Pagina 39)

MVI-ADM ♦ 'C' Programmable Understanding the MVI-ADM API

'C' Programmable Application Development Module Developer's Guide

ProSoft Technology, Inc. Page 39 of 342

February 20, 2013

Block Request from the Processor to the Module

These blocks of data transfer information from the processor to the module. The

structure of the output image used to transfer this data is shown below:

Offset

Description

Length

Write Block ID

1 to n

Write Data

n=60, 120, or 240 depending on the Block Transfer Size parameter (refer to the configuration file).

The Write Block ID is an index value used to determine the location in the

module’s database where the data will be placed.

Block Response from the Module to the Processor

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

Length

Read Block ID

Write Block ID

2 to (n+1)

Read Data

n=60, 120, or 240 depending on the Block Transfer Size parameter (refer to the configuration file).

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. The number of data words per transfer depends on the configured

Block Transfer Size parameter in the configuration file (possible values are 60,

120, or 240).

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 the

application uses three read and two write blocks, the sequence will be as follows:

R1W1R2W2R3W1R1W2R2W1R3W2R1W1

This sequence will continue until interrupted by other write block numbers sent by

the controller or by a command request from a node on the network or operator

control through the module’s Configuration/Debug port.

The following example shows a typical backplane communication application.

If the backplane parameters are configured as follows:

Read Register Start: 0

Read Register Count: 480

Write Register Start: 480

Write Register Count: 480

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 341 342

Comentarios a estos manuales

Sin comentarios

Prosoft-technology MVI69-ADM Manual de usuario Pagina 39

Comentarios a estos manuales

Relacionado con productos y manuales para Relé Prosoft-technology MVI69-ADM