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Open Loop Error in Labview


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Hello all,


I am trying to control a carriage with 4 motors (corresponding to 4 axes: X, Y, a small x and a rotary motor) and a Turbo PMAC CPU using Labview. I just want to input an equation for the motion and move one of the axes according to the equation.


The rotary motor is disconnected from the carriage but all the other axes are connected and functioning. I try to initialize the system with the "pmac_initialize.vi" as shown in the attached snapshot, but get an error that one of the motors is in open loop. Is this the rotary motor that's disconnected? If so, is there a function in PmacPanelPro2 that will disable the motor?


The code that I want to run eventually is "towing.vi". Attached a snapshot of the code. I would like to send commands to the PMAC at 150Hz. Is this the right way to do it or should I be using the DPRAM to send commands and receive responses?


Please let me know. Any help on this would be greatly appreciated.





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