S7-1200, HSC is not reset

dear sir

i am using s7-1200 plc  and make the program in tia v 13.

i also use hsc in the program. and count the value also in it.

but problem is that after a specific vaulue hsc is not reset .i have try to put the value 0 in hsc when cunting value equal to the actual value. but hsc value increase as per as increse the incoder movement. how can i solve the problem please tell me

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Split from Sample Program: S7-1200 High Speed Counter (HSC).