Rockwell Automation 1769-XXXX Compact I/O Modules - Manual (Page 70)

70 Rockwell Automation Publication 1769-IN088A-EN-P - February 2011
Chapter 3 I/O Memory Mapping
1769-IF8 The following I/O memory mapping lets you configure the 1769-IF8 module.
Input Data File
For each input module, slot
x, words 0…7 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…7.
• Lx = Low alarm flag bits for input channels 0…7.
• Hx = High alarm flag bits for input channels 0…7.
• Ux = Under-range flag bits for channels 0…7. When set, the input signal is
under normal range or an open circuit condition exists, in the case of the
4-20mA range.
• Ox = Over-range flag bits for channels 0…7.
Wo
rd
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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 SGN Analog Input Data Channel 4
5 SGN Analog Input Data Channel 5
6 SGN Analog Input Data Channel 6
7 SGN Analog Input Data Channel 7
8 Nu Time Stamp Value
9 Nu Nu Nu Nu Nu Nu Nu Nu S7 S6 S5 S4 S3 S2 S1 S0
10 L3 H3 U3 O3 L2 H2 U2 O2 L1 H1 U1 O1 L0 H0 U0 O0
11 L7 H7 U7 O7 L6 H6 U6 O6 L5 H5 U5 O5 L4 H4 U4 O4