Limit And Home Status Indicators - National Instruments UMI-7774 User Manual

PNP
(Sourcing)
Output Device
V+
Out
V–
Failure to follow these guidelines may result in motion that stops at a limit,
Caution
but then travels through it, potentially damaging the motion system. Incorrectly wired
limits may prevent motion from occurring at all.
Configuring the limit and home status LEDs on the UMI-7774/7772 does not
Note
configure the limit and home inputs themselves as active-high or active-low. You must
configure the limit and home inputs separately on the National Instruments motion
controller using MAX or NI-Motion driver software.
© National Instruments Corporation
Chapter 3
Viso
Input
Out
Current Limiter
Ciso
UMI-7774/7772
Figure 3-16. UMI-7774/7772 Optically Isolated Sinking Input Interface Circuit
and Connection to Sourcing Output Sensor
For the end of travel limits to function correctly, the forward limit must be
located at the forward or positive end of travel, and the reverse limit must
be located at the negative end of travel.

Limit and Home Status Indicators

The UMI-7774/7772 has yellow status LEDs for the forward limit, reverse
limit, and home input signals. Refer to Figure 3-5 for the location of these
LEDs. You can configure the limit and home status LEDs as active-low or
active-high using the switch for the axis labeled LIMIT LED. The down
position of the switch corresponds to active-low and the up position of the
switch corresponds to active-high.
The yellow status LEDs for the limits and home inputs illuminate when the
inputs are active.
Connecting the UMI-7774/7772 to Drives and Other Devices
3-21 National Instruments UMI-7774/7772 User Manual
Vcc