Functional Overview; General Concepts - ProSoft Technology ControlLogix MVI56E-SMGC User Manual

MVI56E-SMGC ♦ ControlLogix™ Platform
Enhanced FMC722 TPU General Communication Module

5.2 Functional Overview

This section provides an overview of how the MVI56E-SMGC module transfers data
using the SMG protocol. You should understand the important concepts in this chapter
before you begin installing and configuring the module.

5.2.1 General Concepts

The following discussion explains several concepts that are important for understanding
the operation of the MVI56E-SMGC module.
5.2.1.1 Module Power Up
On power up, the module begins performing the following logical functions:
1 Initialize hardware components
2 Initialize the TCP/IP stack and Ethernet interface
3 Read configuration for module from SMGC.CFG file on Compact Flash Disk
4 Initialize the client
After the module has received the configuration, the module will attempt to make a
connection to the specified server. After the connection is established, the module will
transfer all the tag indexes to the server and obtain the configuration information. When
this process is complete, the module will begin receiving and transmitting messages.
Messages transmitted by the module are those constructed in ladder logic and passed to
the module. Messages received by the module from the server are passed to the ladder
logic for parsing.
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