The power sequence for VMIVME 2128.
It is important that the grounded conductors are connected to the power supply (GND return) associated with these signal loads. A ground connection should be implemented so as to prevent excessive currents (DC or noise) from flowing through the VMEbus backplane. The externally applied USER voltage should not be applied to the VMIVME-2128 without the VMEbus backplane +5 VDC being on. If these voltages cannot be applied and removed together, then the preferred sequence is: USER voltage ON last, OFF first.