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National Instruments Corporation
21
NI UMI-7774/72 User Guide and Specifications
You can configure the axis Enable output signal as active low or active high using the ENABLE switch.
Refer to Figure 14 for the location of this switch. The down position for the switch corresponds to active
low and the up position for the switch corresponds to active high. Table 3 shows the enable output pin
voltage at different ENABLE switch settings.
Note
You must configure the NI 73xx motion controller Inhibit Out signals as active low for proper
operation of the inhibit logic on the UMI-7774/72. This is the default setting for these signals.
Figure 19 shows a simplifed connection diagram for the Enable, Fault, and Global Stop signals.
Figure 19.
Fault, Enable, and Global Stop Wiring Diagram
Note
If you are connecting the Enable output to inductive loads, such as relays and solenoids,
special precautions may be necessary. Refer to the
Connecting Inductive Loads to the UMI-7774/72
section for more information.
Table 3.
Enable Output Voltage and Switch Settings
Enable Signal State
ENABLE Switch Setting
on UMI
Enable Output Voltage Level
Activated
Active Low
V
iso
Active High
Open
Deactivated
Active Low
Open
Active High
V
iso
Controller
Axis
Inhibit
Host Bus
Interlock
Shutdown
UMI-7774/72
Motion I/O Connector
Axis 1
Enable
Fault
4
Axis 2
Enable
Fault
Drive 1
Drive 2
Global Stops
Shutdown
Inhibit_All
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