Chapter 3
Connecting the UMI-7774/7772 to Drives and Other Devices
©
National Instruments Corporation
3-11
National Instruments UMI-7774/7772 User Manual
Figure 3-9.
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 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)
Refer to the
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-7774/7772.
You can configure the axis Enable output signal as active-low or active-high
using the ENABLE switch. The down position for the switch corresponds
to active-low and the up position for the switch corresponds to active-high.
Refer to Figure 3-5 for the location of this switch. Refer to Figure 3-11 for
a diagram that shows how to wire the Enable signal.
Fault –
Fault +
Viso
Ciso
Vcc
UMI-7774/7772
Low-Side
Switch
Current Limiter
