Wiring Concerns; Other Motion I/O Connections; Digital I/O Connector - National Instruments 7344 User Manual

Note If an external reference voltage is used, it must not be connected to the analog
reference output, since this is an output signal only. You should, however, connect the
external reference's common to the Analog Input Ground pin for proper A/D reference and
improved voltage measurement.

Other Motion I/O Connections

Caution The host +5 V signal is limited to <100 mA and should not be used to power any
external devices, except those intended in the host bus monitor circuits on the UMI and
drive products.

Digital I/O Connector

© National Instruments Corporation

Wiring Concerns

For proper use of each ADC input channel, the analog signal to be
measured should be connected to the channel input and its ground reference
connected to the Analog Input Ground.
The 7344 controller provides other motion I/O connections as follows:
• Host +5 V—This is the host computer's internal +5 V supply. It is used
to detect when the host computer is powered and as an interlock to shut
down external motion system components when the host computer is
turned off.
• Shutdown—The shutdown input signal, when enabled in software, can
be used to kill all motion by zeroing the analog outputs and freezing
the stepper pulse and/or direction outputs.
All of the 7344 controller's general-purpose digital I/O lines are available
on a separate 68-pin digital I/O connector. The pin assignments for this
connector are shown in Figure 5-7.
5-13
Chapter 5 Signal Connections
7344 Hardware User Manual