Allen-Bradley MicroLogix 1200 Reference Manual page 21

Analog I/O Configuration
1762-IF2OF2 Input Data File
For each input module, slot x, words 0 and 1 contain the analog values of
the inputs. The module can be configured to use either raw/proportional
data or scaled-for-PID data. The input data file for each configuration is
shown below.
Table 1.1 Raw/Proportional Format
Bit Position
15 14 13 12 11
0 0 Channel 0 Data 0 to 32768
1 0 Channel 1 Data 0 to 32768
2 reserved
3 reserved
4 reserved
5 U0 O0 U1 O1 reserved
Table 1.2 Scaled-for-PID Format
Bit Position
15 14 13 12 11
0 0 0 Channel 0 Data 0 to 16,383
1 0 0 Channel 1 Data 0 to 16,383
2 reserved
3 reserved
4 reserved
5 U0 O0 U1 O1 reserved
The bits are defined as follows:
• Sx = General status bits for channels 0 and 1. This bit is set when an
error (over- or under-range) exists for that channel, or there is a
general module hardware error.
• Ox = Over-range flag bits for channels 0 and 1. These bits can be used
in the control program for error detection.
• Ux = Under-range flag bits for channels 0 and 1. These bits can be
used in the control program for error detection.
10 9 8 7 6 5
10 9 8 7 6 5
I/O Configuration 1-5
4 3 2 1 0
0 0 0
0 0 0
S1 S0
4 3 2 1 0
0 0
0 0
S1 S0
Publication 1762-RM001C-EN-P