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National Instruments Corporation
4-1
4
Signal Connections
This chapter includes instructions on how to make input and output signal
connections directly to the NI PCI-7390 controller and briefly describes the
associated I/O circuitry.
The PCI-7390 has two connectors that handle all signals to and from the
external motion system:
•
100-pin SCSI I/O connector
•
RTSI connector
You can connect to your motion system with cables and accessories,
varying from simple screw terminal blocks to enhanced drive-specific
Motion Connection Accessory (MCA) units. Refer to Appendix B,
, for more information about the MCA units.
Caution
Do
not
connect or disconnect the PCI-7390 controller I/O cable without first
disconnecting the +24 V power supply from all PCI-7390 boards. Failure to do so may
result in damage to your system and/or PCI-7390 motion controller.
I/O Connector
The I/O connector contains optically isolated motion control signals and
general-purpose signals, including the following features:
•
Motor command stepper outputs
•
Forward, home, and reverse limit inputs
•
Inhibit-in (alarm) inputs
•
In-position inputs
•
Encoder feedback inputs
•
Trigger (position capture) inputs
•
Breakpoint (position compare) outputs
•
General-purpose inputs
–
Drive (servo) ready inputs
–
Shutdown input
