Rockwell Automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I/O Combination Module - Manual (Page 47)

Publication 1769-UM008A-EN-P - November 2001
1769-IF4XOF2 Module Data, Status, and Configuration Channels 4-3
Input Data File The input data file provides access to analog input data for use in the
control program. Input data resolution is 8 bits with the least
significant 7 bits (0 to 6) permanently set to zero (0) by the module. In
addition, over-range indication for the input and output channels, and
output data feedback is provided as described below.
Input Image
The input image file represents input channel data words I/O, and I/O
channel status bits. Input words 0 through 3 contain the converted
analog input data from the field device. Word 4, bit 1,2 and 3 are the
over-range flag bits for input channels 0 to 3. Word 5, bit 0 and 1 are
the over-range flag bits for output channels 0 and 1. Words 6 and 7,
bits 7 through 14 are the data echo. These words provide output
channel loopback/data echo from output channels 0 and 1 through
the input array. See Input Data File on page 4-3 for more information.
Table 4.2 Input Data File
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 Value Channel 0 0 0 0 0 0 0 0
1 SGN Analog Input Data Value Channel 1 0 0 0 0 0 0 0
2 SGN Analog Input Data Value Channel 2 0 0 0 0 0 0 0
3 SGN Analog Input Data Value Channel 3 0 0 0 0 0 0 0
4
Not Used
(1)
(1) All unused bits are set to 0 by the module.
I3 I2 I1 I0
5 Not
Used
(1)
H0 Not
Used
(1)
H1
Not Used
(1) E1 E0 O1 O0
6 SGN Output Data Echo/Loopback for Output Channel 0 0 0 0 0 0 0 0
7 SGN Output Data Echo/Loopback for Output Channel 1 0 0 0 0 0 0 0
TIP
You can access information in the input image file
using the programming software configuration
screen.