ProSoft Technology MVI56-AFC - Manual (Page 76)

Modbus Database MVI56-AFC ♦ ControlLogix Platform
User Manual Liquid and Gas Flow Computer
Page 76 of 316 ProSoft Technology, Inc.
February 25, 2011
The following table shows how the addresses would be remapped between both
slaves:
Primary Modbus Slave Addresses Virtual Modbus Slave Addresses
8162 and 8163 100 and 101
10162 and 10163 102 and 103
12162 and 12163 104 and 105
14162 and 14163 106 and 107
16162 and 16163 108 and 109
Therefore, instead of sending five Modbus commands (2 words each) to the
Primary Modbus Slave, the Modbus Master device can now send one single
Modbus command (10 words) to the Virtual Modbus Slave in order to poll the
same data from the module:
This example demonstrates the benefits of using the Virtual Slave instead of
accessing the data directly from the Primary Modbus Slave. The same procedure
can be used when polling data from the processor (through the backplane)
because the Modbus Gateway block also requires the data to be listed in a
contiguous order.