Input data file – Rockwell Automation 1769-OF2 Compact (Series B or Later) Analog Output Module User Manual
Page 14
14 Compact™ 1769-OF2 (Series B or Later) Analog Output Module
Publication 1769-IN049A-EN-P
Input Data File
For each module, slot x, input data file words 2-3 contain the state of the
module’s output data (output data echo) file words 0-1. During normal
operation, these input words represent the analog values that the outputs
are directed to by the control program. They are also dependent upon the:
• Program Mode configuration (if supported by the controller)
• The Fault Mode configuration (if supported by the controller)
The bit definitions are as follows:
• Dx = Diagnostic bits. When set, they indicate a broken output wire or
high load resistance (not used on voltage outputs).
• Hx = Hold Last State bits. When set, they indicate that the channel is in a
hold last state condition.
• Sx = General Status bits. When set, these bits indicate an error
(over-range, under-range, or diagnostic bit) associated with that channel
or a module hardware error.
• Ux = Under-range flag bits.
• Ox = Over-range flag bits.
• SGN = Sign bit in two’s complement format.
Wo
rd
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
D0
H0
D1
H1
Not Used (Bits set to 0)
S1
S0
1
U0
O0
U1
O1
Bits set to 0
2
SGN
Output Data Loopback/Echo Channel 0
3
SGN
Output Data Loopback/Echo Channel 1
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.
NOTE
It is only important to use these input words if the
controller supports the Program Mode or Fault Mode
function, and if it is configured to use them.