Allen-Bradley MicroLogix 1200 - Page 22

Publication 1762-RM001C-EN-P
1-6 I/O Configuration
1762-IF2OF2 Output Data File
For each module, slot x, words 0 and 1 contain the channel output data.
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.
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.
Table 1.3 Raw/Proportional Format
Word
Bit Position
1514131211109876543210
0 0 Channel 0 Data 0 to 32,768 0 0 0
1 0 Channel 1 Data 0 to 32,768 0 0 0
Table 1.4 Scaled-for-PID Format
Word
Bit Position
1514131211109876543210
0 0 0 Channel 0 Data 0 to 16,383 0 0
1 0 0 Channel 1 Data 0 to 16,383 0 0
Word
Bit Position
15 14131211109876543210
0 SGN0 Channel 0 Data
1 SGN1 Channel 1 Data
2 SGN2 Channel 2 Data
3 SGN3 Channel 3 Data
4reserved S3S2S1S0
5U0 O0U1O1U2O2U3O3reserved
6reserved