Rockwell Automation Publication 5000-UM005B-EN-P - November 2015 27
Common Analog I/O Module Features Chapter 2
Module Data
Quality Reporting
The 5069 Compact I/O analog I/O modules indicate the quality of channel data
that is returned to the owner-controller. Data quality represents accuracy. There
are levels of data quality reported via module input tags.
The following input tags indicate the level of data quality.
•I.Chxx.Fault - This tag indicates that the reported channel data is
inaccurate and cannot be trusted for use in your application. Do not use
the data for control.
If the tag is set to 1, you cannot trust the data reported. You must
troubleshoot the module to correct the cause of the inaccuracy.
Typical causes of inaccurate data include the following:
– Channel is disabled
– Open Wire (input modules) or No Load (output modules) condition
– Underrange/Overrange condition
– Short Circuit condition
We recommend that you troubleshoot the module for the typical
causes first.
•I.Chxx.Uncertain - This tag indicates that channel data can be inaccurate
but the degree of inaccuracy is unknown. We recommend that you do
not use the data for control.
If the tag is set to 1, you know that the data can be inaccurate but you must
troubleshoot the module to discover what degree of inaccuracy exists.
Typical causes of uncertain data include the following:
– Data signal slightly outside the channel operating range
– The channel is slightly over temperature.
– Invalid sensor offset value
– Calibration fault on the channel
– Calibration is in process on the channel - Active calibration process on
one channel can cause an indication of Uncertain data quality on other
module channels simultaneously.
For more information see,
page 28.
We recommend that you troubleshoot the module for the typical
causes first.
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.
IMPORTANT
Once the condition that causes the Fault or Uncertain tag to change to 1 is
removed, the tag automatically resets to 0.
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