Chapter 2
Hardware Overview
NI 951x User Manual
2-8
ni.com
Figure 2-7 shows the NI 9516 block diagram. Refer to Chapter 3,
Signal
Connections
, for more information about the individual signals and
connecting devices to the module.
Figure 2-7.
NI 9516 Block Diagram
User Connectors
The NI 951x has two connectors, a 15-pin DSUB drive interface connector
and a 20-pin MDR feedback connector. The 15-pin DSUB includes
command signals for interfacing with stepper drives or servo amplifiers,
0 to 30 V general-purpose digital input and digital output lines, and an input
for power connection.
The 20-pin MDR connector includes incremental encoder feedback inputs,
a +5 V output for encoder power, home, limit, and position compare inputs,
an output for position compare, an additional input for power connection,
and an additional 0 to 30 V general-purpose digital input line. Refer to
Chapter 3,
Signal Connections
, for details about the signals in each
connector.
Note
The remainder of this document does not distinguish between drives and amplifiers.
All references to drives also apply to amplifiers.
Phase A
± (0)
DAC
Phase B
± (0)
Phase A
± (1)
Phase B
± (1)
Index
± (0)
Home
Digital Input (0-1)
Position
Capture
Position
Compare
Receiver
Circuitry
+5V Reg
+5 V OUT
V
sup
COM
Output
Circuitry
Input
Circuitry
Drive
Command
Drive
Enable
Forward
Reverse
Microprocessor
(PID Loop)
Buffer
Buffer