scxi1124.pdf
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SCXI 6-Channel Isolated
Analog Output
SCXI-1124
Driver Software
NI-DAQ Software
Windows 2000/NT/Me/9x
Mac OS
6 isolated voltage and/or
current outputs
250 V
rms
working
isolation per channel
Software-programmable ranges
0 to 1, 0 to 5, 0 to10, ±1, ±5,
and ±10 V
0-20 mA current outputs
Channels individually configurable
for current or voltage output
12-bit resolution
Combine channels for output voltages
up to ±60 V per module
Software calibration using onboard
calibration EEPROM
Application Software
LabVIEW
Measurement Studio
Lookout
Signal Compatibility
Voltage Output
multiple channels together to create output
signals up to 60 VDC. In voltage mode,
each channel includes a low impedance
output buffer that can drive up to 5 mA.
Alternatively, you can configure any channel
as a programmable 0 to 20 mA sink.
Each current output channel includes a
15 V loop supply, eliminating the need for
external supplies. With this 15 V loop supply,
a current output channel can drive loads of
up to 600
Ω
. You can also use an external
loop supply for higher loads.
Each output channel of the SCXI-1124 is optically isolated. You can
operate the module with up to 250 V
rms
of common-mode voltage
between any two channels or between any channel and earth ground.
EXPRESS
CODES
Current Output
Module
(±1 to ±10 V)
(0-20 mA)
SCXI-1124
For information or to
buy products online,
visit ni.com/catalog
and enter:
Table 1. SCXI Module Compatibility
Overview
The NI SCXI-1124 is a 6-channel isolated source for DC (low bandwidth)
voltage or current signals. The SCXI-1124 includes six independently
isolated, 12-bit Digital to Analog Converter (DAC) channels. You can
configure each for voltage or current output. In voltage mode, you can
configure each output channel for any of the available unipolar or
bipolar ranges. In current mode, each channel outputs a 0 to 20 mA
current. The module is software configurable, and includes an onboard
EEPROM for storing calibration constants. The SCXI-1124 is ideal for
applications requiring isolated voltage or current outputs to control a
process. For more channels, you can use several SCXI-1124 modules in
an SCXI system along with other signal conditioning I/O modules.
The SCXI-1124 is controlled digitally over the SCXIbus, so a single DAQ
device can control several SCXI-1124 modules.
scxi1124
Serial Mode Operation
In serial mode, a single DAQ device sends digital patterns to the data
register of one or more SCXI-1124 modules through the SCXIbus using
a serial data protocol. This serial-mode operation uses a maximum of
five digital I/O lines of the plug-in DAQ device. With serial-mode
operation, you can control several SCXI modules in one or more
chassis using a single device.
Description
Figure 1 is a block diagram of the SCXI-1124. Its major functions are
described in the following paragraphs.
Calibration EEPROM
An onboard calibration EEPROM stores calibration constants
measured at the factory. A set of calibration constants is stored in the
EEPROM for each output range for each channel. Although the
factory calibration constants are permanent and cannot be modified,
Analog Output
The SCXI module has six independently isolated DAC channels.
You can software program each channel for voltage output ranges
such as 0 to 1, 0 to 5, 0 to 10, ±1, ±5, or ±10 V. You can connect
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
523
SCXI 6-Channel Isolated
Analog Output
Figure 1. SCXI-1124 Block Diagram
See page 470 to configure your complete
SCXI system.
an additional user section of the EEPROM stores user-modifiable
constants for calibration under your exact operating conditions.
NI--DAQ driver software transparently uses the calibration constants to
correct for gain and offset errors.
Ordering Information
SCXI-1124
..........................................................776572-24
Signal Connection
Signals from each channel of the SCXI-1124 connect to screw
terminals located in the SCXI-1325 terminal block, which plugs directly
into the module front signal connector, or the TBX-1325, a DIN-rail
mountable terminal block that you connect to the SCXI-1124 with the
SH48-48-A cable. Each channel has screw terminals for voltage
output, isolated ground, current sink, and loop supply.
Extended warranty and
value added services
......................................page 880
Terminal Block
Type
Cable
Page
SCXI-1325
Screw terminals
–
539
(777687-25)
front-mounting
TBX-1325
Screw terminals
SH48-48-A
542
(777207-25)
DIN-rail mount
(183229-01)
Figure 2. Terminal Block Options for SCXI-1124
524
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
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