ProSoft Technology MVI69E-MBTCP - Manual (Page 63)

MVI69E-MBTCP ♦ CompactLogix Platform MVI69E-MBTCP Backplane Data Exchange
Modbus TCP/IP Enhanced Communication Module User Manual
ProSoft Technology, Inc. Page 63 of 150
May 20, 2015
4 MVI69E-MBTCP Backplane Data Exchange
In This Chapter
 General Concepts of the MVI69E-MBTCP Data Transfer ..................... 63
 Backplane Data Transfer ....................................................................... 64
 Normal Data Transfer ............................................................................ 65
 Data Flow Between the Module and Processor ..................................... 70
4.1 General Concepts of the MVI69E-MBTCP Data Transfer
The MVI69E-MBTCP module uses ladder logic to communicate with the
CompactLogix processor across the backplane. The ladder logic handles the
module data transfer, configuration data transfer, special block handling, and
status data receipt.
The following topics describe several concepts that are important for
understanding the operation of the MVI69E-MBTCP module. This is the order of
operations on power-up:
1 The module begins the following logical functions:
o Initialize hardware components
o Initialize CompactLogix backplane driver
o Test and clear all RAM
2 Read configuration from the CompactLogix processor through ladder logic
3 Allocate and initialize Module Register space
4 Enable Modbus TCP/IP Ethernet port
After the module has received the module configuration, the module begins
communicating with other devices on the Modbus network, depending on the
Modbus configuration of the module.