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Evaluating Real numbers in SCL

3/6/2008 8:18 PM	Rate (0)
ER_VT Member Joined: 12/12/2005 Last visit: 2/10/2025 Posts: 7 Rating: (0)	If I have a value that is #NaN on an input variable in SCL the CPU reports a programming error. How can I evaluate this in the SCL code? I can use the OK system variable for expressions but not when reading an Input with ilegal value.

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3/6/2008 10:56 PM	Rate (0)
Phantom75 Posts: 2661 Rating: (279)	You can do this by evaluating a "dummy" expression involving your input variable (see attachment). See also the following FAQ's: Why does the compiler issue the message "Range of a standard function argument exceeded (15:16496)" with a statement with powers? http://support.automation.siemens.com/WW/view/en/23672508 Evaluating the OK flag http://support.automation.siemens.com/WW/view/en/189218 Attachment Dokument1.pdf (809 Downloads)
Phantom75 Posts: 2661 Rating: (279)
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3/7/2008 4:20 PM	Rate (0)
Aret Posts: 2348 Rating: (265)	Another way: VAR_INPUT x:REAL END_VAR VAR_TEMP d_w : DWORD; END_VAR // checking qNaN (and only qNaN andoverflow) d_w := REAL_TO_DWORD(x) AND DW#16#7F800000 if d_w=DW#16#7F800000 then //qNaN or overflow Sorry, there was a mistakeincode-corrected
Aret Posts: 2348 Rating: (265)	Last edited by: Aret at: 11.03.2008 06:23
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