Prosoft-technology MVI69-MCM Manual do Utilizador descarregar pdf (Página 132)

Reference MVI69-MCM ♦ CompactLogix or MicroLogix Platform

User Manual Modbus Communication Module

Page 132 of 167 ProSoft Technology, Inc.

March 22, 2011

Function 15

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

module will write the data using block ID 9959 for multiple-bit data. First the bit

mask clears the bits to be updated. This is accomplished 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.

For MVI69-MCM firmware versions 1.21 and newer only:

Offset Description Length (words)

0 9959 1

1 9959 1

2 Number of Words 1

3 Word Address 1

4 to 53 Data 1

54 to 104 Mask.

Note: For block transfer size = 60, the mask bits are limited

to the count of 6 words (96 bits). Therefore, the practical

data size limit is also 96 bits.

105 to 180 Spare 50

For MVI69-MCM firmware versions earlier than 1.21:

Offset Description Length (words)

0 0 1

1 9959 1

2 Write Block ID 1

3 Number of Words 1

4 Word Address 1

5 to 55 Data 50

56 to 105 Mask 50

106 to 180 Spare 15

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

a write block with the following format.

Offset Description Length (words)

0 9959 1

1 to n Spare

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

cleared from the pass-through queue.

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 166 167

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