ProSoft Technology PTQ-AFC - Manual (Page 84)

Quick Start PTQ-AFC ♦ Modicon Quantum Platform
User Manual Liquid and Gas Flow Computer for Hydrocarbon Products
Page 84 of 259 ProSoft Technology, Inc.
June 23, 2011
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.