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Try It Yourself! To install the demonstration, go into Windows, to the Program Manager, click on File, then click on Run, and enter a:setup. An automated installation routine will place the demonstration files in the designated directories. (NOTE: This demonstration requires LabVIEW for Windows 3.1). To initiate the demonstration, initiate a LabVIEW session by double-clicking on the LabVIEW Icon. Press File...Open...select ADR from the list by double-clicking on ADR. You will see three files - two library files - ADRVI.LLB, DOC.LLB, and the demonstration VI - DOCDEMO.VI. Double-click on DOCDEMO.VI. The "Control Panel" for the Diagnostician Demonstration VI (DOCDEMO.VI) will be displayed on the screen, and is shown at the side.
To see the LabVIEW program wiring diagram, press Window from the horizontal menu bar and then select Show Diagram. To initiate the program, click on the Arrow Icon from the horizontal tool bar (or press Operate...Run).
Open DOC Load a Unit Under Test Diagnostic Knowledge Base (DKB) Tell DOC Pass Test Results to Diagnostician Tell DOC File Tell Diagnostician to read a text file containing test results Ask DOC Ask Diagnostician for Diagnosis, Current Ambiguity Group and Next Test Ask DOC What Request Current Diagnosis (Fault Call-Out or Ambiguity Group) Ask DOC Next Request Next Test to Be Performed Close DOC Unload Diagnostic Knowledge Base NOTE: The TELL DOC function in this demonstration makes use of the TELL DOC FILE SubVI because test results are being simulated in this demo via test results files. To proceed through the demonstration: OPEN DOC Press the Open DOC button. The standard Windows browse window will appear. Select the 221-card directory by double clicking, then select 221-card.dkb and press OK. The 221 card diagnostic knowledge base will be loaded. Upon opening and loading the DKB, the Diagnostician identifies the first set of tests to be performed. These are the Safe-to-Turn-On-Tests (STTO), as indicated by the fact that the test results output file, STTO.OUT, is displayed in the Test Result File field. TELL DOC Pass the STTO test results to the Diagnostician by pressing the TELL DOC button. ASK DOC Request the next step to be performed by pressing the ASK DOC button. ASK DOC returns the Current Ambiguity Group (list of suspects) and Next Test. Since no fault has yet been detected, the suspects list remains empty. The next step is to perform the functional tests, denoted by the file IO-CON.OUT in the Test Result File field. TELL DOC Press TELL DOC to pass the test results of the functional test to the Diagnostician (i.e., Tell the Diagnostician to read the file IO-CON.OUT to obtain the test results). ASK DOC Press ASK DOC for current fault group and identification of next test to be performed. Note that the Suspect List now contains a list of suspect components, or current ambiguity group. ASK DOC also returns the next test to be performed, noted by the Test Result File field J-CONNCT.OUT. This represents the tests associated with the J-Connector, Diagnostic Tests. TELL DOC Press TELL DOC to pass J-Connector diagnostic test results to the Diagnostician. ASK DOC Press ASK DOC for current ambiguity group and next test to be performed. Note that the ambiguity group now contains one component (U1), two capacitors (C21 and C22) and two cathodes (CR14 and CR13). The next test is a probe test of Pin 1 of Synchro B (which is U1), denoted by the Test Results File SYN_B_P1.OUT. TELL DOC Press TELL DOC to pass J-Connector diagnostic test results to the Diagnostician. ASK DOC Press ASK DOC for current ambiguity group and next test to be performed. Note that the ambiguity group now contains one component (U1), two capacitors (C21 and C22) and two cathodes (CR14 and CR13). The next test is a probe test of Pin 1 of Synchro B (which is U1), denoted by the Test Results File SYN_B_P1.OUT. TELL DOC Press TELL DOC to indicate execution of the probe test and passing of the test result to the Diagnostician. ASK DOC Press ASK DOC to obtain fault call-out. Note that the TELL DOC button is now disabled, indicating that the diagnostic session has been completed. The CLOSE DOC button is enabled. A diagnostic session is complete when either the ambiguity group contains only one item, or there are no additional tests which will provide diagnostic resolution. CLOSE DOC Press CLOSE DOC to end diagnostic session. At any point, you can look at the actual flow of operations through the program by pressing on the Light-Bulb Icon from the Horizontal Icon Bar. The Light Bulb will turn to yellow to indicate that the mode is activated. Operating in this mode generally slows operations, but allows you to trace through the progression of the program while it is operating. You can also maximize the DOCDEMO.VI Diagram Window and use the scroll bar to view operations which are out of the current display screen. If it appears that operations are in a loop, the program may be waiting for you to continue by pressing one of the control panel buttons (OPEN DOC, TELL DOC, ASK DOC or CLOSE DOC). If you wish, you may look at the detailed flow of the SubVIs by double-clicking on its icon. The SubVI's Control Panel will be displayed and you can select Window...Show Diagram to see the internal program structure. The AGAIN and STOP control buttons can be used as follows: AGAIN will set the demo in a mode where upon ending a diagnostic session, the OPEN DOC button will become enabled. STOP will set the demo in a mode where upon ending a diagnostic session, operations are complete. To re-run the demo, you must press the Arrow icon from the horizontal icon bar (or select Operate...Run). |
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Four
of the seven Diagnostician SubVIs are used in this demonstration program:
OPEN DOC, TELL DOC, ASK DOC and CLOSE DOC. The seven Diagnostician SubVIs
are: 