Input data file – Rockwell Automation 1769-OF4CI CompactLogix 1769-OF4CI Module User Manual
Page 18
18 Compact 1769-OF4CI Isolated Analog Output Module
Rockwell Automation Publication 1769-IN075B-EN-P - August 2010
Input Data File
For each module, slot x, input data file words 2…5 contain the state of the
module’s output data (output data echo) file words 0…3. During normal
operation, these input words represent the analog values that the outputs are
directed to by the control program.
•
S = General status (over-range, under-range, or low/high clamp
exceeded).
•
H = Output held bit.
•
U = Under-range (or low-clamp exceeded) alarm.
•
O = Over-range (or high-clamp exceeded) alarm.
Wo
rd
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
S3
S2
S1
S0
1
H3
U3
O3
H2
U2
O2
H1
U1
O1
H0
U0
O0
2
Channel 0 Data Value
3
Channel 1 Data Value
4
Channel 2 Data Value
5
Channel 3 Data Value
IMPORTANT
The output module’s input data file reflects the analog output
data echo of the module, not necessarily the electrical state of
the output terminals. It does not reflect shorted or open outputs.