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2426 Instruction Manual

Analog Interfaces

Chapter 5: Analog Interfaces

5.1 Analog Inputs

Six 12-bit, analog input channels are provided to enable

measurement of up to six external voltages. Each channel

implements a fully differential input pair so that either

single-ended or differential voltage measurements may be

made on any channel. Unused channels may be left

disconnected. External analog channels are numbered 0 to 5.

Figure 3: Analog Input Interface Block Diagram

All analog inputs have a fixed input voltage range of ±10V

with nominal 12 bit resolution. The analog input span extends

slightly beyond ±10V to guarantee a full ±10V measurement

range under worst-case conditions and to make it possible to

digitally calibrate the external channels.

Two internal reference channels supply precision reference

voltages (0V and +5V) to the ADC. Data from these references

can be used to digitally correct measurement errors caused by

aging and temperature variations.

5.1.1 Analog Input Scanning

All analog inputs (external and internal) are digitized by the

module once per millisecond. This scanning process runs

continuously and is independent of client requests for analog

input sample data.

When a client requests analog input data, the module returns

the most recent sample values for each channel along with

timestamps that indicates when the samples were acquired.

5.2 Analog Output

One 12-bit analog output channel (AOUT) is provided, with a

fixed output voltage range of ±10V. This output is well suited

for motor speed control or other general purpose uses.

Figure 4: Analog Output Interface Block Diagram

AOUT is referenced to AGND, so applications that require a

differential analog output will typically use the AOUT and

AGND signals as a differential pair.

The voltage produced at AOUT changes immediately in

response to client commands.

5.3 Analog Connector

Analog I/O connections are made through the 25-pin AIO

connector (see Figure 2 for connector location). The AIN and

AOUT interfaces both share the AIO connector.

ADC

Analog

Reference

Channel

Generator

Select

Mux

Input

Protect

External

Analog

Internal Data Bus

Inputs

Table 2: AIO Connector Pin Assignments

Pin Name Function

2, 4, 6, 8,

10, 12, 13

AGND

Analog ground references for all AOUT and

AIN channels.

15, 17,

19, 21, 23

+24V

+24VDC outputs. These can be used to supply

operating power to external loads.

1 +AIN0 AIN channel 0 positive input

14 -AIN0 AIN channel 0 negative input

3 +AIN1 AIN channel 1 positive input

16 -AIN1 AIN channel 1 negative input

5 +AIN2 AIN channel 2 positive input

18 -AIN2 AIN channel 2 negative input

7 +AIN3 AIN channel 3 positive input

20 -AIN3 AIN channel 3 negative input

9 +AIN4 AIN channel 4 positive input

22 -AIN4 AIN channel 4 negative input

11 +AIN5 AIN channel 5 positive input

24 -AIN5 AIN channel 5 negative input

25 AOUT Analog output voltage

DAC

Reference

Generator

Buffer

Amplifier

Internal Data Bus

Analog

Output

Setpoint

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 16 17

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