Configuring the MVI56E-MCMR Module MVI56E-MCMR ♦ ControlLogix Platform
User Manual Modbus Communication Module with Reduced Data Block
Page 82 of 223 ProSoft Technology, Inc.
With the offset parameters listed above, the Modbus Master could read from coils
10001 to 10176 using the tags MCMR.DATA.WRITEDATA[0] TO [9]. The Master
could also read from address 30001 to 30490, and the data contained in those
Modbus addresses would come from the tags MCMR.DATA.WRITEDATA[10] TO
[499] within the ControlLogix program.
The Master could then write to coils addressing 0001 to 0160 and this data would
reside within the ControlLogix program in tags MCMR.DATA.READDATA[0] TO
[9]. The Master could then write to registers using Modbus addresses 40001 to
40590, and this information would reside in addresses
MCMR.DATA.READDATA[10] TO [599].
Note: The offset parameter only set the starting location for the data. As shown above, if the
Master issues a Write command to address 40001, the data will go into the ControlLogix processor
at address MCMR.DATA.READDATA[10].
Likewise, a Write To bit address 0161 will also change to address
MCMR.DATA.READDATA[10].0 within the program. Be careful not to overlap your
data. You may want leave additional registers/bits unused to allow for future
expansion in the program.
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