Thank you YUL725 for point it out. I could get the drive into AB after manually switched the XM to BB and run some plc open commands. normally C450 is set as 4(BB) and I didn't check it and it was set 2(P2). however after I set it to BB. the sercos is getting into BB and shows no error, but the drives are still in CM mode and don't automatically get into BB. now I need to manually switch the phase from drive side. I cycle the power few time times and nothing changed. the drives are configure to run into run mode automatically after sercos in BB. see some screen shots below. there is another issue I want to mention here. if the parameters are changed in drive from CtrlX drive engineering it won't automatically update the same parameters in the controller or vice versa. have to make sure the parameters the same at both sides. I don't know if there is a plan to make the parameters updated at same time on both sides automatically.
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