REAL Variable showing ERROR value when negetive

abhirupbera · Nov 25, 2016

In Codesys (NEXGENIE 500 PLC) , where the program is written the REAL value of a power source Incomer KW is giving error value when it is actually negetive. But It should give zero or negetive real value.

Details:- if INCOMER KW is actually -300 KW(Taking reverse power), it is showing 4224296300 KW, but everything OK when drawing positive power.

%MD2100------>DWORD_TO_REAL------>KW_INCOMER (%MD3130)
IN PROGRAM LIKE ABOVE. PLEASE HELP ABOUT HOW TO MAKE IT ZERO OR NEGETIVE REAL VALUE.

Geoff White · Nov 25, 2016

Try using DINT_TO_REAL

abhirupbera · Nov 29, 2016

Thank you! It's working Geoff White

shooter · Nov 29, 2016

a word can not be negative, so not in 2 complement.
INT is the answer.
so you learned something.

REAL Variable showing ERROR value when negetive

abhirupbera

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Geoff White

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abhirupbera

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shooter

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