Vb MMI Stepping motor homing issue


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I am having an issue with the homing of a stepper motor in our machine. The issue is that the motor is not homing when we send the command through our MMI program. When we run the standalone Program that has come with the Mycomm, there is no issue with the homing sequence. But when we run from the MMI, the motor just move for a pulse and then stop intermittently. The homing routine in our library we are using works well for other stepper motors but behave strangely for one motor alone. Can someone encountered anything similar to it in your work. Any suggestions would be helpful?