Allen-Bradley MicroLogix 1200 Reference Manual page 22

1-6 I/O Configuration
Publication 1762-RM001C-EN-P
1762-IF2OF2 Output Data File
For each module, slot x, words 0 and 1 contain the channel output data.
Table 1.3 Raw/Proportional Format
Bit Position
15 14 13 12 11
0 0 Channel 0 Data 0 to 32,768
1 0 Channel 1 Data 0 to 32,768
Table 1.4 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
1762-IF4 Input Data File
For each 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 either configuration is
shown below.
Bit Position
15 14 13 12
0 SGN0 Channel 0 Data
1 SGN1 Channel 1 Data
2 SGN2 Channel 2 Data
3 SGN3 Channel 3 Data
4 reserved
5 U0 O0 U1 O1 U2 O2 U3 O3 reserved
6 reserved
The bits are defined as follows:
• Sx = General status bits for channels 0 through 3. 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 through 3. These bits are set when the
input signal is above the user-specified range. The module continues to
convert data to the maximum full range value during an over-range condition.
The bits reset when the over-range condition clears.
• UIx = Under-range flag bits for input channels 0 through 3. These bits are set
when the input signal is below the user-specified range. The module continues
to convert data to the maximum full range value during an under-range
condition. The bits reset when the under-range condition clears.
• SGNx = The sign bit for channels 0 through 3.
10 9 8 7 6
10 9 8 7 6
11 10 9 8 7 6
5 4 3 2 1 0
0 0 0
0 0 0
5 4 3 2 1 0
0 0
0 0
5 4 3 2 1 0
S3 S2 S1 S0