Which function do you expect? And which version do you use?
You have CXA_PLCopen.MC_Stop (version 1.8.0.4) for decelerating an axis and stop it completely.
You have CXA_PLCopen.MC_AxisInterrupt (version 1.16.0.0) to temporarily stop the axis and be able to continue the still active movement command.
See also general library documentation.
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