Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 171)

Publication 1756-UM009C-EN-P - December 2010 171
Isolated Analog Output Modules (1756-OF6CI and 1756-OF6VI) Chapter 8
Data Echo
Data Echo automatically multicasts channel data values which match the
analog value that was sent to the module’s screw terminals at that time.
Fault and status data also is sent. This data is sent in the format (floating point
or integer) selected at the requested packet interval (RPI).
User Count Conversion to Output Signal
User counts can be computed in Integer mode for the 1756-OF6CI and
1756-OF6VI modules.
The straight line formulas that can be used to calculate or program a
Compute (CPT) instruction are shown in the table.
For example, if you have 3.5 mA in the 0…20 mV range, the
user counts = -21884. Counts = 6231 for 2 V in the
+/-10 V range.
For a table with related values, refer to ControlLogix 1756-OF6CI and OF6VI
User Count Conversion to Output Signal, Knowledgebase Technical Note
IDs 41574 and 41576.
Available Range User Count Formula
O…20 mA y = 3109.7560975609754x-32768
where y = counts; x = mA
+/-10V y = 3115.669867833032x-0.5
where y = counts; x = V