Rockwell Automation 1769-XXXX Compact I/O Modules - Manual (Page 152)

152 Rockwell Automation Publication 1769-IN088A-EN-P - February 2011
Chapter 3 I/O Memory Mapping
1769-OF8V The following I/O memory mapping lets you configure the 1769-OF8V module.
Input Data File
For each module, slot
x, input data file words 3…10 contain the state of the
module’s output data (output data echo) file words 0…7. During normal
operation, these input words represent the analog values that the outputs are
directed to by the control program.
The bits are defined as follows:
• PF = Analog power fail.
• S = General status (over-range, under-range, or open-circuit).
• D = Open-circuit diagnostics.
• 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 PF S7 S6 S5 S4 S3 S2 S1 S0
1 D3 H3 U3 O3 D2 H2 U2 O2 D1 H1 U1 O1 D0 H0 U0 O0
2 D7 H7 U7 O7 D6 H6 U6 O6 D5 H5 U5 O5 D4 H4 U4 O4
3 Channel 0 Data Value
4 Channel 1 Data Value
5 Channel 2 Data Value
6 Channel 3 Data Value
7 Channel 4 Data Value
8 Channel 5 Data Value
9 Channel 6 Data Value
10 Channel 7 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.