Prosoft-technology MVI69E-MBS Manual de usuario descargar pdf (Pagina 144)

Reference MVI69E-MBS ♦ CompactLogix Platform

User Manual Communication Module

Page 144 of 162 ProSoft Technology, Inc.

January 6, 2014

7.4.15 Pass-through Formatted Block for Function 5

Block 9958: Pass-through Formatted Block for Function 5

Block 9958: Request from Module to Processor

Offset

Description

Read Block ID: 9958

Write Block ID: 9958

Number of word registers in Modbus data set

Starting address for Modbus data set

4 to (n+1)

Data (Length in words = n - 2)

Where n = 60, 120, or 240 depending on the Block Transfer Size parameter.

The ladder logic is 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.

Block 9958: Response from Processor to Module

Offset

Description

Write Block ID: 9958

1 to n

Spare (Length in words = n - 2)

This informs the module that the command has been processed and can be

cleared from the pass-through queue.

7.4.16 Pass-through Formatted Block for Function 15

Block 9959: Pass-through Formatted Block for Function 15

When the module receives a function code 15 in pass-through mode, the module

writes the data using block ID 9959 for multiple-bit data. First the bit mask clears

the bits to be updated. This is accomplished in RSLogix 5000 by ANDing the

inverted mask with the existing data.

Next, the new data ANDed with the mask is ORed with the existing data. This

protects the other bits in the INT registers from being affected. This function can

only be used if the Block Transfer Size parameter is set to 120 or 240 words.

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Prosoft-technology MVI69E-MBS Manual de usuario Pagina 144