NI UMI-7774/72 User Guide and Specifications
20
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Figure 18.
Example of Wiring a Low-Side Switch to the Fault Input
Enable Output
The Enable output signal is an optically isolated digital output used to enable or disable the drive for the
axis. The Enable signal for the axis is deactivated when any of the following signals are asserted:
•
Host Bus Interlock (global)
•
Inhibit All (user-supplied and global)
•
User-supplied external Fault input (per axis)
•
Controller Axis Inhibit Out (per axis)
•
Controller Shutdown (if enabled on the controller)
If the Enable output signal is deactivated for any reason, the
DISABLED
LED illuminates. If the Fault
input signal is also active, both the
FAULT
and the
DISABLED
LEDs for the axis illuminate. Refer to
Figure 14 for the locations of these LEDs.
Refer to the
Global Stop
section for information about the Inhibit All and Shutdown signals. The host bus
interlock is a safety feature that is not user-configurable. It monitors the +5 V pin from the motion
controller to verify that the motion controller is powered on and properly connected to the UMI-7774/72.
Fault –
Fault +
Viso
Ciso
Vcc
UMI-7774/72
Low-Side
Switch
Current Limiter
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