ProSoft Technology MVI56E-SIE - Manual (Page 104)

Ladder Logic MVI56E-SIE ♦ ControlLogix Platform
User Manual Client Communication Module
Page 104 of 168 ProSoft Technology, Inc.
September 6, 2012
3.1 Controller Tags
Data related to the MVI56E-SIE is stored in the ladder logic in variables called
controller tags. Individual controller tags can be grouped into collections of
controller tags called controller tag structures. A controller tag structure can
contain any combination of:
 Individual controller tags
 Controller tag arrays
 Lower-level controller tag structures
The controller tags for the module are pre-programmed into the Add-On
Instruction Import Rung ladder logic. Controller Tags can be found in the
subfolder, located in the Controller folder in the Controller Organizer pane of the
main RSLogix 5000 window.
This controller tag structure is arranged as a tree structure. Individual controller
tags are found at the lowest level of the tree structure. Each individual controller
tag is defined to hold data of a specific type, such as integer or floating-point
data. Controller tag structures are declared with user-defined data types, which
are collections of data types.
3.1.1 MVI56E-SIE Controller Tags
The main controller tag structure, SIE, is broken down into four lower-level
controller tag structures.
The four lower-level controller tag structures contain other controller tags and
controller tag structures. Click the [+] sign next to any controller tag structure to
expand it and view the next level in the structure. For example, the SIE.DATA
controller tag structure is expanded, it can be seen that there are two controller
tag arrays, SIE.DATA.ReadData and SIE.DATA.WriteData, which are 600-
element integer arrays by default.