Chapter 3
Connecting the UMI-7774/7772 to Drives and Other Devices
National Instruments UMI-7774/7772 User Manual
3-8
ni.com
Analog Output
The UMI-7774/7772 analog output signals are used as command outputs to
servo drives or as general-purpose voltage outputs. To help keep digital
noise separate from the analog outputs, Pin 9 provides a separate analog
output ground connection. Use this analog ground connection instead of
a digital ground when you connect the UMI-7774/7772 to servo drives.
Analog outputs are pass-through signals from the motion controller. A
pass-through signal provides passive filtering on the signals, which does
not affect the voltage range or current-handling capability of the signals.
Step (CW) and Dir (CCW)
The UMI-7774/7772 Step (CW) and Dir (CCW) signals are used as
command outputs to a stepper drive. Some stepper drives require clockwise
direction (CW) and counter-clockwise direction (CCW) commands rather
than Step and Dir commands. You can configure National Instruments
motion controllers to provide either type of stepper commands. Both Step
and Dir signals are pass-through signals.
9
Analog Output
Ground
No
10
Digital Ground
No
11
Digital Ground
No
12
Dir (CCW)
No
13
NC
No
14
Fault –
Yes
15
Iso Common
Yes
Table 3-2.
Per Axis Control Connector Pin Assignment (Continued)
Pin
Signal
Optically Isolated
