Chapter 3
Connecting the UMI-7774/7772 to Drives and Other Devices
©
National Instruments Corporation
3-9
National Instruments UMI-7774/7772 User Manual
Fault
The Fault signal is an optically isolated digital input. If the Fault input
signal is asserted, the
DISABLED
LED is lit and the Enable output signal
is deactivated. You can wire the Fault input to either a current sourcing or
sinking output from a drive or other device. Refer to Figure 3-6 and
Figure 3-7 for examples of wiring the Fault input signal to sourcing and
sinking output devices. In both cases, the isolated power (V
iso
) and isolated
common (C
iso
) signals provided on the control connector are used to power
the external devices.
Use a manual operator switch to handle disabling an axis. Refer to
Figure 3-8 and Figure 3-9 for examples of wiring the fault input signal to
high-side and low-side switches.
You can configure the axis Fault input signals as active-low or active-high
inputs using the switch for the axis labeled
FAULT
. The down position
of the switch corresponds to active-low and the up position of the switch
corresponds to active-high.
Refer to the
Voltage Considerations for the UMI-7774/7772
for voltage information that applies to the Fault input signal.
Figure 3-6.
Example of Wiring a Sourcing Output Device to the Fault Input
Current Limiter
PNP
(Sourcing)
Output Device
Fault –
Viso
Ciso
Vcc
UMI-7774/7772
V–
V+
Out
Fault +
