Analog Inputs - National Instruments PCI-7340 User Manual And Specifications

To the external
connector breakpoint pins

Analog Inputs

The NI 7340 motion controller has the following ADC input signals:
• Analog Input <1..4>—The NI 7340 motion controller includes an eight-channel
multiplexed, 12-bit ADC capable of measuring ±10 V, ±5 V, 0 to 10 V, and 0 to 5 V inputs.
ADC channels 1 through 4 are brought out externally on the 68-pin motion I/O connector.
ADC channels 5 through 8 are connected internally, as shown in Table 4-2. These signals
can be used for ADC test and system diagnostics.
ADC Input
5
6
7
8
You can configure each ADC channel for motion feedback, simple A/D conversion, or
both.
You can read the digital value of analog voltage on any of the eight ADC channels of the
controller. Table 4-3 shows the range of values read back and the voltage resolution for each
setting. The voltage resolution is in volts per least significant bit (V/LSB).
Input Range
±10 V
±5 V
0 to 10 V
0 to 5 V
Figure 4-8. Breakpoint Output Circuit
Vcc
3.3 kΩ
Table 4-2. Internal ADC Channels
Filtered +5 V
Floating (NC)
Analog Reference (7.5 V)
Analog Input Ground
Table 4-3. Analog Input Voltage Ranges
Binary Values
-2,048 to 2,047
-2,048 to 2,047
0 to 4,095
0 to 4,095
NI 7340 User Manual and Specifications
74AS760
breakpoint circuits
Signal
From the
Resolution
0.0049 V/LSB
0.0024 V/LSB
0.0024 V/LSB
0.0012 V/LSB
© National Instruments | 4-11