1761-6.5
DNI Configuration Parameters and Programming Notes
5-7
Input Word Offset
This parameter identifies the starting word within the input file identified by
the parameter Input Data File. The value entered is the first word of data
that is read from the controller attached to the DNI. Based on the DF1
Device selected, the sizes of compatible data files within Allen-Bradley
controllers are:
Parameter
Type
Parameter Number Description Range Default Value
Series A Series B
I/O 7 5 Input Word Offset 0 to 254 0
Controller Input Data Files File Sizes
MicroLogix 1000
Bit 32 Words
Integer 105 Wor ds
SLC/Other MicroLogix
Bit 255 Words
Integer 255 Wor ds
PLC
Bit 999 Words
Integer 999 Words
Note:
The DNI can only access data from words 0 through 254.
Important:
You must have sufficient room in the file that you select. Make
sure the Input Word Offset plus the Input Size does not exceed
the boundary of the controller’s data file. For example, a
MicroLogix 1000 controller has 32 words in its bit file;
therefore, you could not use a Input Word Offset of 30 and a
Input Size of 5 because this exceeds the file size.
Important:
If RSNetworx or DeviceNet Manager is used to configure/
commission the DNI, it is up to the user to select the correct
values for:
•
Input Size
•
Input Split Point (DNI Series B only)
•
Input Type
•
Input Data File
•
Input Word Offset
Only the DNI Configuration Software Utility performs checks
on the information entered.
AB Parts
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