Reference MVI56E-MCM ♦ ControlLogix Platform
User Manual Modbus Communication Module
Page 130 of 209 ProSoft Technology, Inc.
Block Request from Processor to Module
3002 to 3003 or 3102 to 3103
The module will recognize the request by receiving the special write block code
and respond with a read block with the following format:
Block Response from Module to Processor
3002 to 3003 or 3102 to 3103
Ladder logic can be written to override the value in the Slave status table. It can
disable (state value of 3) by sending a special block of data from the processor to
the Slave. Port 1 Slaves are disabled using block 3000, and Port 2 Slaves are
disabled using block 3100. Each block contains the Slave node addresses to
disable. The following table describes the structure of the block.
Block Request from Processor to Module
Number of Slaves in Block
The module will respond with a block with the same identification code received
and indicate the number of Slaves acted on with the block. The following table
describes the format of the response block.
Block Response from Module to Processor
Number of Slaves processed
Ladder logic can be written to override the value in the Slave status table to
enable the Slave (state value of 1) by sending a special block. Port 1 Slaves are
enabled using block 3001, and Port 2 Slaves are enabled using block 3101. Each
block contains the Slave node addresses to enable. The following table
describes the format for this block.
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