MVI69E-MBS ♦ CompactLogix™ Platform
MVI69E-MBS Backplane Data Exchange
Modbus Serial Enhanced Communication Module
User Manual
ProSoft Technology, Inc.
Page 66 of 159
5
MVI69E-MBS Backplane Data Exchange
5.1
General Concepts of the MVI69E-MBS Data Transfer
The MVI69E-MBS module uses ladder logic to communicate with the CompactLogix or
MicroLogix 1500-LRP 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-MBS 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 or MicroLogix 1500-LRP backplane driver
o
Test and clear all RAM
2
Read configuration from the CompactLogix or MicroLogix 1500-LRP processor
through ladder logic
3
Allocate and initialize Module Register space
4
Enable Modbus application port(s)
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.
