ProSoft Technology MVI69E-LDM - Manual (Page 40)

Contents MVI69E-LDM ♦ "C" Programmable
Developer's Manual Linux Application Development Module
Page 40 of 130 ProSoft Technology, Inc.
August 21, 2014
Controller Tags have global scope. To access a controller scope tag, you only need to
specify the tag controller name. For example:
TagName Single tag
Array[11] Single dimensioned array element
Array[1,3] Two dimensional array element
Array[1, 2, 3] Three dimensional array element
Structure.Element Structure element
StructureArray[1].Element Single element of an array of structures
Program Tags are tags declared in a program and scoped only within the program in which
they are declared. To correctly address a Program Tag, you must specify the identifier
"PROGRAM:" followed by the program name. A dot (.) separates the program name and the
tag name.
PROGRAM:ProgramName.TagName
PROGRAM:MainProgram.TagName Tag "TagName in program called "MainProgram"
PROGRAM:MainProgram.Array[11] An array element in program "MainProgram"
PROGRAM:MainProgram.Structure.Element A Structure Element in program "MainProgram"
Rules
 A tag name can contain up to 40 characters.
 A tag name must start with a letter or underscore ("_"). All other characters can be
letters, numbers or underscores.
 Names cannot contain two contiguous underscore characters and cannot end in with an
underscore.
 Letter case is not significant.
 The naming conventions are based on the IEC-1131 Rules for Identifiers.
For additional information on CompactLogix CPU tag addressing, please refer to the
CompactLogix User Manual.
3.2 MVI69E-LDM Development Tools
An application that is developed for the MVI69E-LDM module must be executed from the
module’s Flash ROM disk. Tools are provided with the API to build the disk image and
download it to the module’s Config/Debug port. See Building a Project (page 34).