Manual indicates a communication error betwen SPM and SVM.
This machine has connected two SPM with the same PSM. Actually both drives are in trouble. May I replace both?
How I can determinate what drive is faulted?
I'll appreciate your help.

PSM = 0
SPM 1 = b0 (Head 1)
SPM 2 = b0 (Head 2)
SVM 1 = P (Head 1, 1 axes)
SVM 2 = P (Head 1, 2 axes)
SVM 3 = P (Head 2, 2 axes )
SVM 4 = P (Head 2, 1 axes)
SVM 5 = P (Head 3 or LC, 2 axes)

Alpha i series drives