©
National Instruments Corporation
3-1
NI 951x User Manual
3
Signal Connections
This chapter describes how to make input and output signal connections
directly to the National Instruments 951x drive interface modules and
describes the associated I/O circuitry.
Table 3-1 describes the signals available on the modules.
Table 3-1.
NI 951x Signal Reference
Signal
Signal Name
Signal Overview
Stepper Command Signals
Step (CW)+
Step (CW)–
• Configurable Step/Direction or
CW/CCW output mode
• Configurable single-ended or
differential output type
• 5 MHz max pulse rate
Direction (CCW)+
Direction (CCW)–
Servo Command Signals
Drive Command
• Separate reference to help keep digital
noise separate from the analog output
• 16-bit analog output
• ±10 V range
Drive Command COM
Drive Enable
Drive Enable
• Connects to the enable function of the
drive
• 0 to 30 V output configurable as sinking
or sourcing
• 100
μ
s minimum output pulse width