Please have a look to the MC_Stop documentation. It aborts an command decelerates to standstill. No switching to AH is intended.
C1300 is an drive related command and MC_Stop is a motion (control) related command. Are you using the motion function ML_AxsFixedStop or function block MC_AxsFixedStop? Or do you directly command the drive via parameter channel? Then you would also have to stop the your command the same way.
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