Rockwell Automation Publication 5094-UM001C-EN-P - April 2019 47
Common Digital I/O Module Features Chapter 2
Module Data Quality
Reporting
The FLEX 5000 digital I/O modules indicate the quality of point data that is
returned to the owner-controller. Data quality represents accuracy. Levels of data
quality are reported via module input tags.
The following inputs indicate the level of data quality.
• I.Ptxx.Fault - This tag indicates that the reported point data is inaccurate
and cannot be trusted for use in your application. Do not use the reported
channel 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.
Example causes of inaccurate data include the following:
– Field Power Loss condition (output modules)
– No Load condition (output modules)
– Short Circuit condition (output modules)
• I.Ptxx.Uncertain - This tag indicates that the reported point data can be
inaccurate but the degree of inaccuracy is unknown. We recommend that
you do not use the reported channel data for control.
If the tag is set to 1, you know that the data can be inaccurate. You must
troubleshoot the module to discover what degree of inaccuracy exists.
Example causes of uncertain data include the following:
– Module is operating outside its designed operating range
– Data is under manual or override control
STATUS
POWER
SAFETY DIGITAL 16 INPUT 24 VDC
5094-IB16S
5
5
TB3I
FLEX 5000
TM
I/O
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
STATUS
POWER
DIGITAL 16 INPUT 24 VDC
5094-IB16
1
1
TB3
FLEX 5000
TM
I/O
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Safety Modules
Standard Modules
IMPORTANT Once the condition that causes the Fault or Uncertain tag to change to 1 is
removed, the tag automatically resets to 0. The Logix Designer application
controls the tags. You cannot change the status of the tags.
Keep in mind that in some system configurations, the tag is not reset
immediately after the condition is removed. The tag typically resets after a
small delay.
TIP We recommend that you troubleshoot the module for the typical
causes first.
TIP We strongly recommend that you monitor the tags in your program to
make sure that the application is operating as expected with accurate
channel input data.
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