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SIMATIC WinCC: How Towards determine whether the object exist Within activate pdl Including Ansi-c

I have some i/o field with objectname like "value1","value2","value3","value4","value5".I wrote FOR statement ,use GetLinkedVariable function.But I delete i/o field with objectname "value3",my statement break;
so,How to check my object exist in the pdl?

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