Other Support Objects - ProSoft Technology ControlLogix MVI56E-SMGC User Manual

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

3.1.6 Other Support Objects

Other support objects are defined in the main data object for the module to hold the size
information for each of the data types used in the SMGC protocol. The following table
defines these members:
Object
AI_Max_Index
AO_Max_Index
DI_Max_Index
DO_Max_Index
Tag index values are assigned to work with the member values set in the object and
greatly simplify the ladder logic. For example, analog input points in the server are
defined with the following tag index values: 5000 to 9999. For example, the analog input
data can be set up as an array of 100 analog points (AI_Max_Index = 100) with tag
indexes assigned 5000 to 5099. These data are stored in an array of type
SMGC_Data_AI with array indices of [0] to [99]. The start tag index (fixed for the specific
data type) can be used to determine the offset into an array based on the tag index
received in a data block from the server and the maximum index can be used to check
its validity.
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Description
Maximum index for AI array
Maximum index for AO array
Maximum index for DI array
Maximum index for DO array
Using Controller Tags
User Manual
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