ProSoft Technology MVI56E-MCM/MCMXT - Manual (Page 62)

Configuration as a Modbus Slave MVI56E-MCM ♦ ControlLogix Platform
User Manual Modbus Communication Module
Page 62 of 199 ProSoft Technology, Inc.
June 18, 2014
MVI Address 0xxx 1xxxx 3xxxx 4xxxx Tag Address
1100 1601 to 1616 40091 ReadData[100]
1200 3201 to 3216 40191 ReadData[200]
1500 8001 to 8016 40491 ReadData[500]
1598 9569 to 9584 40589 ReadData[598]
1599 9585 to 9600 40590 ReadData[599]
With the offset parameters listed above, the Modbus Master could read from coils
10001 to 10176 using the tags MCM.DATA.W
RITE D ATA [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 MCM.DATA.W
RITE D ATA [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 MCM.DATA.R
EAD D ATA [0] TO [9].
The Master could then write to registers using Modbus addresses 40001 to
40590, and this information would reside in addresses
MCM.DATA.R
EAD D ATA [10] TO [599].
Note: The offset parameter only sets 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 MCM.DATA.R EAD D ATA [10].
Likewise, a Write To bit address 0161 will also change to address
MCM.DATA.R
EAD D ATA [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.
3.3 Slave Configuration
Any parameters not mentioned in this section are not used when the module is
configured as a Modbus Master.
Value Description
Enabled 1= enable port, 0 = disable port
Type 1= Modbus Slave Port
The module also supports a variety of Pass-Through modes. See
Pass-Through Blocks (page 129) for more information.
FloatFlag As a Slave, emulates Enron/Daniel style floats. See Floating-Point
Data Handling (Modbus Slave) (page 63) for more information.
FloatStart Register offset in message for floating data point. See Floating-
Point Data Handling (Modbus Slave) (page 63) for more
information.
Protocol 0 = Modbus RTU mode, 1 = Modbus ASCII mode
Baudrate Sets the baud rate for the port. Valid values for this field are 110,
150, 300, 600, 1200, 2400, 4800, 9600, 19200, 384 or 3840 (for
38,400 baud), 576 or 5760 (for 57,600 baud) and 115,1152, or
11520 (for 115,200 baud)
Parity 0 = None, 1 = Odd, 2 = Even
DataBits 8 = Modbus RTU mode, 8 or 7 = Modbus ASCII mode