Module Data Quality Reporting
The I/O modules indicate the quality of channel data that is returned to the
owner-controller. Levels of data quality are reported via module input tags.
IMPORTANT:
Once the condition that causes the
Fault
or Uncertain
tag to change to
1 is removed, the tag automatically resets to 0. You cannot change the status of the
tags. These tags are not always reset immediately after the condition is removed and
typically resets after a small delay.The following input tags indicate the level of data quality:
- I.Chxx.Fault- When the fault bit is set, this tag indicates that the reported channel 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 must troubleshoot the module to correct the cause of the inaccuracy.Example causes of inaccurate data include the following:
- Channel is disabled
- Connection fault is detected
- Short Circuit condition
- No Load condition
- Field Power Loss condition
TIP: You must troubleshoot the module for the typical causes first. - I.Chxx.Uncertain- This tag indicates that the reported channel data can be inaccurate but the degree of inaccuracy is unknown. 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:
- Requested output signal is outside of maximum operating range
- Received output data is "Not a Number"
- Calibration data missing on the channel
- Calibration is ongoing on the channel
TIP:
You must monitor the tags in your program to make
sure that the application is operating as expected.
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