Prosoft-technology MVI69-ADM Manual de usuario descargar pdf (Pagina 36)

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

Developer's Guide 'C' Programmable Application Development Module

Page 36 of 342 ProSoft Technology, Inc.

February 20, 2013

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

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

read data. Each transfer can move up to 200 words (block offsets 2 to 201) of

data. In addition to moving user data, the block also contains status data for the

module. This last set of data is transferred with each new block of data and is

used for high-speed data movement.

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

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.

Module Configuration Data Transfer Block (9000)

When the module performs a restart operation, it will request configuration

information from the ControlLogix processor. This data is transferred to the

module in specially formatted write blocks (output image). The module will poll for

each block by setting the required write block number in a read block (input

image).

This block sends general configuration information from the processor to the

module. The data is transferred in a block with an identification code of 9000.

The structure of the block is shown in the following table.

Offset

Description

Length

9000

1 to 6

Backplane Set Up

7 to 15

Port 1 Configuration

16 to 24

Port 2 Configuration

25 to 247

Spare

223

The read block used to request the configuration has the following structure:

Offset

Description

Length

Reserved

9000

Module Configuration Errors

Port 1 Configuration Errors

Port 2 Configuration Errors

5 to 248

Spare

244

249

-2 or -3

If there are any errors in the configuration, the bit associated with the error will be

set in one of the three configuration error words. The error must be corrected

before the module starts operating.

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