ProSoft Technology MVI46-MCM - Manual (Page 68)

Reference MVI46-MCM ♦ SLC Platform
User Manual Modbus Communication Module
Page 68 of 108 ProSoft Technology, Inc.
March 29, 2011
Block Request from Processor to Module
M1 Offset Description Length
7800 3000 or 3100 1
7801 Number of Slaves in Block 1
7802 to 7927 Slave Indexes 126
The module will respond with a block with the same identification code received
and indicate the number of slaves acted on with the block.
Block Response from Module to Processor
M0 Offset Description Length
0 3000 or 3100 1
1 Number of Slaves Processed 1
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.
Block Request from Processor to Module
M1 Offset Description Length
7800 3001 or 3101 1
7801 Number of Slaves in Block 1
7802 to 7927 Slave Indexes 126
The module will respond with a block with the same identification code received
and indicate the number of slaves acted on with the block.
Block Response from Module to Processor
M0 Offset Description Length
0 3001 or 3101 1
1 Number of Slaves Processed 1