SCXI Terminal Blocks
SCXI Terminal Blocks
• Terminal blocks for quick,
easy connections
• Strain-relief clamps
for reliable wiring
• Connectivity options including BNC and
thermocouple plugs
• Shielded front-mount
terminal blocks
• Rack and DIN-rail mount options
available
• Terminal block options for specific
measurement types
• Onboard temperature sensor
for cold-junction compensation
• Isothermal construction
for high-accuracy
thermocouple measurements
• High-voltage attenuation
• AC/DC coupling
• Bridge offset nulling,
shunt calibration
• Current inputs
Overview
National Instruments SCXI terminal blocks provide a convenient
method for connecting and disconnecting signals to your system. The
NI SCXI-13xx front-mount terminal blocks feature direct connections
to transducers at the screw terminals located within a fully shielded
enclosure or at front-mounted BNC connectors. Strain-relief clamps hold
the signal wires safely in place. You can also choose either the TC-2095
or BNC-2095 rack-mount terminal blocks for minithermocouple
connectors or BNC connectors. These terminal blocks are ideal
solutions for high-channel-count temperature or voltage applications.
TBX DIN-rail mount terminal blocks are an alternative to the SCXI-13xx
terminal blocks which attach directly to the front of an SCXI module. The
TBX system includes shielded cables that connect the front I/O connector
of an SCXI module to a TBX terminal block.
Terminal Block
TBX-1303
TBX-1316
TBX-1325
TBX-1326
TBX-1328
TBX-1329
TBX-96
TBX-24F
1
CB-50
1
The
Some terminal blocks are designed for specific input types, such as
thermocouples, strain gages, and high-voltage inputs. See tables 2, 3,
and 4 to determine which SCXI terminal blocks are compatible with your
SCXI module.
Figure 1. Terminal Block Configuration
Compatible SCXI Modules
SCXI-1100, SCXI-1102, SCXI-1102B/C, SCXI-1181
SCXI-1120/D, SCXI-1125, SCXI-1126
SCXI-1124
SCXI-1162, SCXI-1162HV, SCXI-1163, SCXI-1163R
SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, SCXI-1126
SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, SCXI-1126
SCXI-1100, SCXI-1102, SCXI-1102B/C
All modules
SCXI-1180
Cabling
SH96-96 or R96-96
SH32-32-A
SH48-48-A
SH48-48-B
SH32-32-A
SH32-32-A
SH96-96 or R96-96
SCXI-1104, SCXI-1181, SCXI-1104C
User-supplied wiring
NB1
CJC
–
–
–
–
–
–
–
Special Features
Open TC detection isothermal construction, selectable ground referencing
200:1 attenuation (up to 1,000 VDC)
High-voltage 250 VDC
High-voltage 250 VDC
Sockets for current input resistors, isothermal construction,
high-voltage 250 VDC
Selectable AC coupling (rejects up to 250 VDC)
–
–
–
TBX-24F is a general-purpose feedthrough terminal block that you can use with any SCXI module or front mounting terminal blocks.
Table 1. TBX Terminal Block Selection Guide
SCXI Terminal Blocks
TBX Terminal Block
Selection Guide
Use the following steps to select the correct combination
of TBX terminal blocks and cables for your SCXI system:
1. Select the required terminal blocks –
For each
SCXI module, use table 1 to select the proper TBX
terminal block. If a TBX-13xx terminal block is not
available for your SCXI module, select the appropriate
number of general-purpose TBX-24F feedthrough
terminal blocks.
2. Select cabling –
For each TBX terminal block, table
1 lists the cable needed to connect the TBX terminal
block to the SCXI module. Shielded cables are available
in lengths of 1, 2, and 5 m. If using the TBX-1303, you
also have the option to build a custom cable using the
SBS-96F backshell kit. For each TBX-1303 for which you
will build a custom cable, select two SBS-96F kits.
If using the TBX-24F, you will use discrete wires to
connect the TBX-24F to an SCXI front-mounting terminal
block. Therefore, select the appropriate SCXI front-
mounting terminal block for each SCXI module that
will use the TBX-24F.
3. Rack-mount accessory (optional) –
If mounting
for 19 in. rack enclosures is needed, use table 2 to select
the appropriate number of TBX-RM1 rack-mount kits.
4. Calibration –
Calibration of cold-junction sensors
and attenuation terminal blocks is available for some
devices. For more information, please visit
ni.com/calibration.
Terminal Block
TBX-1303
TBX-1325, TBX-1326, TBX-1328, TBX-1329, TBX-24F, CB-50
Module
SCXI-1100
SCXI-1102
SCXI-1102B
SCXI-1102C
SCXI-1104/C
SCXI-1120
SCXI-1120D
SCXI-1126
SCXI-1125
SCXI-1121
SCXI-1122
SCXI-1124
SCXI-1127
SCXI-1128
SCXI-1129
SCXI-1140
SCXI-1141
SCXI-1142
SCXI-1143
SCXI-1160
SCXI-1161
SCXI-1162/HV
SCXI-1163/R
SCXI-1180
SCXI-1181
SCXI-1181K
SCXI-1503
SCXI-1520
SCXI-1540
SCXI-1581
1
Cold-junction
Terminal Blocks
SCXI-1303
2
SCXI-1300
3
SCXI-1308
BNC-2095
TC-2095
SCXI-1300
SCXI-1305
SCXI-1320
SCXI-1327
SCXI-1328
SCXI-1338
SCXI-1304/5
SCXI-1313A
SCXI-1320
SCXI-1327
SCXI-1328
SCXI-1338
SCXI-1320
SCXI-1321
SCXI-1327
SCXI-1328
SCXI-1305
SCXI-1322
SCXI-1325
SCXI-1331
SCXI-1332
SCXI-1333
SCXI-1334
SCXI-1335
SCXI-1336
SCXI-1337
SCXI-1339
SCXI-1301
SCXI-1304
SCXI-1305
SCXI-1304
SCXI-1305
SCXI-1301
SCXI-1324
–
SCXI-1326
–
SCXI-1302
SCXI-1300
SCXI-1301
SCXI-1306
SCXI-1314
SCXI-1315
SCXI-1300
CJC
1
Sensor
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Other Terminal Block Functions
Isothermal, signal ground referencing, and open thermocouple detection
–
Current input, 249
Ω
resistor across each input
BNC connectors, signal ground referencing
Thermocouple plugs, signal ground referencing, isothermal
–
BNC connectors, AC/DC coupling and ground referencing
–
Extends signal input range to 300 V
rms
, switch configurable per channel
Isothermal, high-accuracy design for thermocouples
Current input, 249
Ω
resistor across each input
BNC connectors, AC/DC coupling and ground referencing
Extends signal input range to 150 V
rms
, programmable per channel
–
Extends signal input range to 300 V
rms
, switch configurable per channel
Isothermal, high-accuracy design for thermocouples
Current input, 249
Ω
resistor across each input
–
Offset nulling and shunt calibration for strain gages
Extends signal input range to 300 V
rms
, switch configurable per channel
Isothermal, high-accuracy design for thermocouples
BNC connectors, AC/DC coupling and signal ground referencing
–
–
–
Set up an 8 column by 4 row matrix
Configures SCXI-1129 as quad, 4 x 16 (2-wire) matrix
Configures SCXI-1129 as 4 x 64 (2-wire) matrix
Configures SCXI-1129 as 8 x 32 (2-wire) matrix
Configures SCXI-1129 as 16 x 16 (2-wire) matrix
Configures SCXI-1129 as a dual 8 x 16 (2-wire) matrix
Configures SCXI-1129 as a dual 4 x 32 (2-wire) matrix
–
AC/DC coupling and signal ground referencing (configurable per channel)
BNC connectors, AC/DC coupling and signal ground referencing
AC/DC coupling and signal ground referencing (configurable per channel)
BNC connectors, AC/DC coupling and signal ground referencing
–
–
Screw terminals located in module
–
–
50-pin terminal block
–
–
–
Quarter-bridge completion/shunt resistor
–
–
compensation (CJC) sensor for thermocouple measurements.
2
Recommended for thermocouples; includes isothermal design and high-precision
CJC sensor.
3
Recommended for RTDs when using both SCXI-1102 and SCXI-1581.
Table 3. SCXI-13xx, TC, and BNC Selection Guide
Width Required (TBX-RM1 Rack-Mount)
One-half
One-third
Module
SCXI-1100, SCXI-1102B/C, SCXI-1140, SCXI-1141, SCXI-1181
SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1126, SCXI-1181
Connector and Shell Assembly
SCXI-1310
SCXI-1330
Table 2. Rack-Mount Widths of TBX Terminal Blocks
Table 4. Custom Cabling Accessories
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2
SCXI Terminal Blocks
SCXI-1300
........................................................................................................................777687-00
The SCXI-1300 connects input signals to the SCXI-1100, SCXI-1102/B/C, and SCXI-1104/C
modules. The SCXI-1300 is a general-purpose terminal block with an onboard temperature
sensor for cold-junction compensation. Also works with SCXI-1181 and SCXI-1181K modules.
SCXI-1301
........................................................................................................................777687-01
20-screw terminal block for the SCXI-1140, SCXI-1181, and SCXI-1181K modules.
Figure 1. SCXI-1303 Terminal Block
SCXI-1302
........................................................................................................................777687-02
50-screw terminal block for the SCXI-1180 feedthrough panel.
SCXI-1303
(see Figure 1) ................................................................................................777687-03
Terminal block for use with the SCXI-1100 and SCXI-1102/B/C modules. Designed especially for
high-accuracy thermocouple measurements, the SCXI-1303 includes isothermal construction
that minimizes errors caused by thermal gradients between terminals and the cold-junction
sensor. The SCXI-1303 also includes circuitry for open-thermocouple detection as well as
automatic ground referencing for floating (nongrounded) thermocouples.
Figure 2. SCXI-1305 Terminal Block
SCXI-1304
........................................................................................................................777687-04
The SCXI-1304, for the SCXI-114x modules, includes AC coupling circuitry, with switches on
each channel. Each channel also includes a switchable connection to ground through a 100 kΩ
bias resistor to provide a reference for floating input sources.
SCXI-1305
(see Figure 2) ................................................................................................777687-05
Includes convenient BNC connectors for use with the SCXI-1120/D, SCXI-1121, SCXI-1125,
SCXI-1126, and SCXI-114x. Functionally equivalent to the SCXI-1304 terminal block, the
SCXI-1305 includes switchable AC coupling circuitry and ground referencing on each channel.
SCXI-1306
........................................................................................................................779698-01
Terminal block for the SCXI-1503 RTD module. Provides 16 pairs of screw terminals for
differential input signals and 16 pairs of screw terminals for current excitation signals. You
can configure each channel for voltage or resistive measurements.
SCXI-1308
........................................................................................................................777687-08
Current input terminal block for the SCXI-1100 and SCXI-1102/B/C analog input modules. Each
input includes a 249
Ω
precision resistor so you can read 0 to 20 mA and 4 to 20 mA current
inputs.
SCXI-1310
(see Figure 3) ................................................................................................777687-10
Connector and shell assembly used to create custom cabling solutions from the SCXI-1100,
SCXI-1102/B/C, SCXI-1104/C, SCXI-114x, and SCXI-1181 to custom terminations. A low-cost
alternative to SCXI terminal blocks, it consists of a hardened plastic enclosure and one
connector with solder pins for signal connections.
SCXI-1313A
....................................................................................................................777687-13
Extends the input range of the SCXI-1125 to 150 V
rms
or 150 VDC, on a per-channel basis
programmatically through software commands. The SCXI-1313A also includes an onboard
temperature sensor for thermocouples cold-junction compensation.
Figure 3. SCXI-1310 Connector and Shell Assembly
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SCXI Terminal Blocks
SCXI-1314
........................................................................................................................777687-14
Front-mounting terminal block for the SCXI-1520 module. With factory-installed and socketed
350
Ω
quarter-bridge completion resistors for each channel. Eight 120
Ω
resistors for use with
120
Ω
quarter-bridge strain gauges are included, but not installed. It also includes two factory-
installed, socketed 100 kΩ shunt calibration resistors per channel.
SCXI-1315
........................................................................................................................777687-15
8-channel front-mounting terminal block for the SCXI-1540 LVDT with six terminals for each
LVDT channel – CH+, CH-, EX+, EX-, Synch, and GND.
SCXI-1320
(see Figure 4) ................................................................................................777687-20
General-purpose terminal block for connecting signals to the SCXI-1120/D, SCXI-1121, SCXI-1125,
and SCXI-1126 modules. It includes an onboard temperature sensor for cold-junction
compensation using thermocouples, but the SCXI-1328 is recommended for precision
thermocouple measurements.
SCXI-1321
(see Figure 5) ................................................................................................777687-21
Adds nulling and shunt calibration to SCXI-1121 strain guage applications. With a front-panel
trimming potentiometer, you can manually null out the offset voltage of bridge transducers. Each
channel includes shunt calibration circuits. When activated, a switch connects a 301 kΩ shunt
resistor in parallel with the strain gauge. Both the nulling resistor and the shunt resistor are
socketed for easy customization.
SCXI-1322
........................................................................................................................777687-22
Terminal block required to connect signals to the SCXI-1122 module that includes an onboard
temperature sensor for cold-junction compensation.
Figure 6. SCXI-1327 Terminal Block
Figure 4. SCXI-1320 Terminal Block
Figure 5. SCXI-1321 Terminal Block
SCXI-1324
........................................................................................................................777687-24
High-voltage terminal block with 48 screw terminals for the SCXI-1160 relay module.
SCXI-1325
........................................................................................................................777687-25
26-screw terminal block for the SCXI-1124 module.
SCXI-1326
........................................................................................................................777687-26
High-voltage terminal block with 48 screw terminals for the SCXI-1162 Series and SCXI-1163
Series modules.
SCXI-1327
(see Figure 6) ................................................................................................777687-27
With the SCXI-1327 you can extend the input range of the SCXI-1120/D, SCXI-1121 and
SCXI-1125 to ±300 V
rms
, and extend the threshold level of the SCXI-1126 module from 5 V up
to 300 V. The extended input voltage range is enabled or disabled on a per-channel basis using
switches located within the SCXI-1327. The SCXI-1327 also includes an onboard temperature
sensor for cold-junction compensation with thermocouples. Using the SCXI-1327 reduces the
input impedance of your SCXI module to 1 MΩ.
SCXI-1328
(see Figure 7) ................................................................................................777687-28
Isothermal terminal block with a high-precision cold-junction sensor for high-accuracy
thermocouple applications with the SCXI-1120/D, SCXI-1121, or SCXI-1125.
Figure 7. SCXI-1328 Terminal Block
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4
SCXI Terminal Blocks
SCXI-1330
........................................................................................................................777687-30
Connector and shell assembly (hardened plastic enclosure and solder pins) used to create
custom cabling solutions from the SCXI-1120/D, SCXI-1121, SCXI-1125, SCXI-1126, and
SCXI-1181 to custom terminations.
SCXI-1331
(see Figure 8) ................................................................................................777687-31
General-purpose terminal block for the SCXI-1127 multiplexer/matrix module with 64 generic
screw terminals and a cold-junction compensation sensor. For SCXI-1127 multiplexer
applications or matrix configurations other than a multiple of eight columns by four rows.
Includes sockets for matrix expansion cables.
SCXI-1332
(see Figure 9) ................................................................................................777687-32
Multiplexer/matrix terminal block for the SCXI-1127 configures the SCXI-1127 as an eight
column by four row switching matrix. You can connect signals to both the columns and rows
using screw terminals.
Figure 9. SCXI-1332 Terminal Block
Figure 8. SCXI-1331 Terminal Block
SCXI-1333
........................................................................................................................777687-33
SCXI-1334
........................................................................................................................777687-34
SCXI-1335
........................................................................................................................777687-35
SCXI-1336
........................................................................................................................777687-36
SCXI-1337
........................................................................................................................777687-37
SCXI-1339
........................................................................................................................777687-39
These terminal blocks are designed for use with the SCXI-1129 high-density matrix switching
module. Each of these terminal blocks gives the high-density matrix a different configuration.
SCXI-1338
........................................................................................................................777687-38
Current input terminal block for the SCXI-1120/D, SCXI-1125, and SCXI-1126. Each input
includes a 249
Ω
precision resistor for reading 0 to 20 mA or 4 to 20 mA current inputs.
BNC-2095
(see Figure 10)................................................................................................777508-01
The BNC-2095 has 32 labeled BNC connectors, one for each input channel of the SCXI-1100 or
SCXI-1104/C. The BNC-2095 also includes circuitry for configurable signal referencing. You can
enable or disable both the pull-up and pull-down resistors on a per-channel basis using switches.
TC-2095
............................................................................................................................777509-01
The TC-2095 has 32 miniature uncompensated thermocouple plugs, one for each input channel
of the SCXI-1100 or SCXI-1102/B/C and a thermistor for accurate cold-junction compensation.
In addition, the TC-2095 includes circuitry for configurable signal referencing. You can enable or
disable both the pull-up and pull-down resistors on a per-channel basis using switches located
on the rear of the TC-2095. The TC-2095 is not recommended for use with the SCXI-1104/C.
The TC-2095 requires the SH96-96 or R96-96 for connection to an SCXI module.
Figure 10. BNC-2095
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