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I am using CTU_UDINT counter efb in Unity Pro, but the data in CV overflow above the PV value, why

The CTU_**** counter works to the maximum values of the data type being used. No overflow occurs. Since you have used UDINT you should refer to below note about data type UDINT.

UDINT is the abbreviation of Unsigned Double INTeger (encoded in 32 bits). The upper/lower limits are 0 to (2 to the power of 32) - 1. For eg. 
0, 4294967295, 2#11111111111111111111111111111111, 8#37777777777, 16#FFFFFFFF.
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