ProSoft Technology MVI69L-MBTCP - Manual (Page 67)

MVI69L-MBTCP ♦ CompactLogix Platform Backplane Data Exchange
Communication Module User Manual
ProSoft Technology, Inc. Page 67 of 152
January 6, 2014
4 Backplane Data Exchange
In This Chapter
 Backplane Data Transfer ....................................................................... 68
 Normal Data Transfer ............................................................................ 69
 Data Flow Between the Module and Processor ..................................... 71
Ladder logic is required for the MVI69L-MBTCP module 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.
For most applications, the sample Add-On Instruction (which includes the ladder
logic) will work without modification.
The following topics describe several concepts that are important for
understanding the operation of the MVI69L-MBTCP module.
1. On power up the module begins the following logical functions:
- Initialize hardware components
- Initialize CompactLogix backplane driver
- Test and clear all RAM
2. Read configuration from the CompactLogix processor via ladder logic
3. Allocate and initialize Module Register space
4. Enable Modbus TCP/IP Ethernet port
5. After the module has received the Module Configuration, the module will
begin communicating with other devices on the Modbus network,
depending on the configuration