ProSoft Technology MVI69-MCM - Manual (Page 123)

MVI69-MCM ♦ CompactLogix or MicroLogix Platform Reference
Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 123 of 167
March 22, 2011
Read Block - Disable Slaves
Here is the structure of the Disable Slaves input image block.
Offset Description Length (words)
0 3000 or 3100 1
1 Write Block ID 1
2 Number of slaves disabled 1
3 to ( n + 1 ) Spare ( n - 1 )
( n ) = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the configuration
file).
Write Block - Enable Slaves
Here is the structure of the Enable Slaves output image block:
Offset Description Length (words)
0 3001 or 3101 1
1 Number of slaves to enable with this block 1
2 to 60 List of addresses of slaves to enable 59
61 to ( n ) Spare (present only if Block Transfer Size > 60) ( n - 60 )
( n ) = 120, or 240 depending on the Block Transfer Size parameter (refer to the configuration file).
The module will respond with an input image block with the same identification
code and indicate the number of slaves enabled by this function.
Read Block - Enable Slaves
Here is the structure of the Enable Slaves input image block.
Offset Description Length (words)
0 3001 or 3101 1
1 Write Block ID 1
2 Number of slaves enabled 1
3 to ( n + 1 ) Spare ( n - 1 )
( n ) = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the configuration
file).
Important: The slaves are enabled by default. Therefore, this block should only be used to re-
enable slaves that have been disabled by using block 3000 or 3100 .