Rockwell Automation Publication 1756-UM540E-EN-P - December 2017 25
Analog I/O Module Features Chapter 2
Common causes of uncertain data include the following:
– The channel is actively being calibrated.
– An invalid sensor offset value exists.
– The last data sample of the channel failed the CRC check between the
module processor and the Analog to Digital Converter (ADC) which
results in the most recent valid data sample was used.
– The channel is not calibrated.
We recommend that you monitor these tags in your program to make sure that
the application is operating as expected with accurate channel input data.
Calibration
These modules use precise analog components that maintain their specifications
over time. The modules are calibrated at the factory and recalibration is not
required.
If desired, you can recalibrate the modules on a channel-by-channel or module-
wide basis. For more information, see Calibrated Accuracy
on page 34 if you
choose to recalibrate the modules in the future.
Fault and Status Reporting
The modules provide fault and status data along with channel data. Faults are
indicated via the status indicators on the front of the module and the module
tags. Status data is available via the module tags.
• For more information on fault and status reporting via module tags, see the
following:
– 1756-IF8I fault and status reporting - page 58
– 1756-IRT8I fault and status reporting - page 88
– 1756-IR12 fault and status reporting - page 88
– 1756-IT16 fault and status reporting - page 88
– 1756-OF8I fault and status reporting - page 97
• For more information on fault reporting via status indicators, see
Chapter 9
, Troubleshoot Your Module on page 165
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