Rockwell Automation Publication 1769-IN088A-EN-P - February 2011 57
I/O Memory Mapping Chapter 3
1769-IF4I
The following I/O memory mapping lets you configure the 1769-IF4I module.
Input Data File
For each input module, slot x, words 0…3 in the input data file contain the analog
values of the inputs.
The bits are defined as follows:
• SGN = Sign bit in two’s complement format.
• Nu = Not used. Bit set to 0.
• Sx = General status bit for input channels 0…3.
• Lx = Low alarm flag bits for input channels 0…3.
• Hx = High alarm flag bits for input channels 0…3.
• Ux = Under-range flag bits for channels 0…3. When set, the input signal is
under normal range or an open circuit condition exists, in the case of the 4-
20 mA range.
• Ox = Over-range flag bits for channels 0…3. When set, the input signal is
over normal range or an open circuit condition exists. Open circuit
detection applies to voltage input ranges only.
Word
Bit Position
15 14131211109876543210
0 SGN Analog Input Data Channel 0
1 SGN Analog Input Data Channel 1
2 SGN Analog Input Data Channel 2
3 SGN Analog Input Data Channel 3
4 Nu Time Stamp Value
5 Nu NuNuNuNuNuNuNuNuNuNuNuS3S2S1S0
6 L3 H3U3O3L2 H2U2O2L1 H1U1O1L0 H0U0O0
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