TSTQ Module 1,01,02 Block 1001 tests Module 1,01,02 Block 1002 (FC 3 block N+1), which does not have quality
The TSTQ block inputs must have quality. If they do not, the test will not work. T: Analog Transfer [FC9] blocks and SQRT: Square Root [FC7] blocks are ones that are often tested in error.
This message tells you that a TSTQ: Test Quality [FC31] is being used to test a signal that does not have the Quality attribute, or the signal being tested has no quality to propagate. The input will never be found to have bad quality and no action will happen that might be intended.
Signals that have quality are represented in DBDOC as blue or purple lines on CAD and CLD diagrams. Function codes that have quality or propagate the quality of their input are listed at Function codes with quality.
This message sometimes appears where macros have been taken to implement logic, so it might not be an error. However, we often find such oversights as testing the quality of an Analog Tranfer function block instead of its intput, or the quality of a digital logic block rather than the inputs or outputs to the block.
--Post Processing drawing T CCW Pumps Auto Trip TSTQ Module 1,02,10 Block 6031 tests Module 1,02,10 Block 5663 (FC 38), which does not have quality
It is very important to note that this error will only cause a problem when a signal that is counted upon goes bad quality and the logic fails to detect that problem. It was missed in checkout and commissioning, or in subsequent work because it cannot be tested validly.
This message is likely to show an error in the system configuration. It should be reviewed. The issue raised may be in unused logic or graphics, or have other realities that make it a non-issue.
Please contact us for help resolving your error messages.
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