Resetting rotary axis to zero when it reaches its limits

Hi everyone
I have a problem on resetting rotary axis when it reaches to its limits and make it start from zero in imspost software. The rotary limit is -99999 to +99999. I want the rotary axis start again from zero to 99999 when it reaches its limit 99999. Could anyone please help me how can I solve this problem?
Thanks a lot
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