I monitored three value in VAT,
1.Data block value one word.
2.Direct PIW, same word that i used to monitor in data block.
3.Returen Value of SFC14. which is always W#16#0000
Only data block's word flickers after some time for the period of miliseconds.
For your information, i only used one SFC14 in my whole programm for testing purpose there is no other program. Only OB1, FC1, DB1, and SFC14.