Rockwell Automation Publication 1769-IN088A-EN-P - February 2011 65
I/O Memory Mapping Chapter 3
1769-IF4FXOF2F
The following I/O memory mapping lets you configure the 1769-IF4FXOF2F
module.
Input Data File
For each module, slot x, words 0…3 in the input data file contain the converted
value of the module’s analog input channels. Word 4 in the input data file
contains the time stamp value corresponding to the module's last input data
sampling period. Words 5 and 6 in the input data file contain status bits for the
analog input channels. Word 7 in the input data file contains status bits for the
analog output channels. Words 8 to 9 contain the directed values of the analog
output channels (output data echo).
The bits are defined as follows:
• SGN = Sign bit in 2’s complement format.
• Nu = Not Used. Bit set to 0.
• SIx = General Status bit for input channels 0…3.
• OIx = Over range flag bits for input channels 0…3.
• UIx = Under range flag bits for input channels 0…3.
• HIx = High Alarm flag bits for input channels 0…3.
• LIx = Low Alarm flag bits for input channels 0…3.
• SOx = General Status bit for output channels 0…1.
• OOx = Over range flag bits for output channels 0…1.
• UOx = Under range flag bits for output channels 0…1.
Word
Bit Position
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
0 SGN Analog Read (Input) Data Value Channel 0 0
1 SGN Analog Read (Input) Data Value Channel 1 0
2 SGN Analog Read (Input) Data Value Channel 2 0
3 SGN Analog Read (Input) Data Value Channel 3 0
4 0 Time Stamp Value
5 Nu Nu Nu Nu Nu Nu Nu Nu Nu Nu Nu Nu SI3 SI2 SI1 SI0
6 LI3 HI3 UI3 OI3 LI2 HI2 UI2 OI2 LI1 HI1 UI1 OI1 LI0 HI0 UI0 OI0
7 Nu Nu UO1 OO1 Nu Nu UO0 OO0 Nu Nu Nu Nu Nu Nu SO1 SO0
8 SGN Output Data Loopback/Echo Channel 0 0 0
9 SGN Output Data Loopback/Echo Channel 1 0 0
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