Prosoft-technology MVI69-MCM Manual de usuario descargar pdf (Pagina 131)

MVI69-MCM ♦ CompactLogix or MicroLogix Platform Reference

Modbus Communication Module User Manual

ProSoft Technology, Inc. Page 131 of 167

March 22, 2011

Function 6 and 16

Here is the structure of the input image write block for Formatted Pass-Through

Control Block IDs 9956 and 9957.

For MVI69-MCM firmware versions 1.21 and newer only:

Offset Description Length (words)

0 9956/9957 1

1 9956/9957 (floating-point) 1

2 Length 1

3 Data Address 1

4 to ( n + 1 )

Data

( n - 2 )

For MVI69-MCM firmware versions earlier than 1.21:

Offset Description Length (words)

0 0 1

1 9956/9957 (floating-point) 1

2 Number of words 1

3 Data Address 1

4 to ( n + 1 )

Data

( n - 2 )

The ladder logic will be responsible for parsing and copying the received

message and performing the proper control operation as expected by the Master

device. The processor must then respond to the pass-through control block with

an output image write block with the following format.

Offset Description Length (words)

0 9956/9957 1

1 to ( n )

Spare

( n - 2)

This will inform the module that the command has been processed and can be

cleared from the pass-through queue.

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

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Prosoft-technology MVI69-MCM Manual de usuario Pagina 131