Rockwell Automation 283A ArmorStart with ArmorPoint Backplane - Getting Started - Manual (Page 20)

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Publication 283A-QS001C-EN-P - July 2006
Figure 17 Data Array
The value to be modified is the .data element of the structure. For reference,
the Min_value, Max_value, and Name_String for the parameter is also in
the structure, so that the user knows what the minimum and maximum
allowable values are for the data. It is important to realize that the data is in
a raw format. In other words, this data could be considered a Boolean, a bit
mask, an ASCII string, an integer, a byte, etc., depending on the definition
of the parameter in the ArmorStart. Also, there could be an implied decimal
point, scaling, and different units involved. It is important that the user
fully understand and verify the raw data value being modified with the
user manual, so that it is correctly interpreted by the ArmorStart or
undesired operation in the ArmorStart may occur.
Once the data is written, during a System Wide Write function, the ladder
logic will read it back and put into the .Last_Read_Value of the structure.
This will be a handy visual verification that the data was written correctly.