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INSTALLATION GUIDE
NI TB-2708
PXI Terminal Block for S Series Devices
This installation guide describes how to install and connect signals to the
NI TB-2708 terminal block for use with PXI-6115/6120 S Series devices.
Caution The connectors of the TB-2708 are sensitive to electrostatic discharge (ESD). The
user should ground themselves and/or design watchdog timing into their application prior
to connecting or disconnecting signals.
Introduction
The TB-2708 is a terminal block assembly consist
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The nine SMB connectors on the TB-2708 allow you to easily connect analog input and analog output signals to your National Instruments device. The 14-pin I/O connector located on the bottom of the TB-2708 allows access to digital signals. Caution The TB-2708 is not designed for input voltages greater than 42 V /60 VDC, pk even if you install a voltage divider that reduces the voltage to within the input range of the DAQ device. Input voltages greater than 42 V /60 VDC can damage the TB-2708
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Do not substitute parts or modify equipment. Because of the danger of introducing additional hazards, do not install unauthorized parts or modify the device. Return the device to National Instruments for service and repair to ensure that its safety features are not compromised. You must insulate all of your signal connections to the highest voltage with which the TB-2708 can come in contact. Connections, including power signals to ground and vice versa, that exceed any of the maximum signal
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To connect the terminal block to the PXI module I/O connector, refer to Figure 2 as you complete the following steps: 1. Install the PXI module into the chassis and tighten the two module screws. You must install the PXI device before connecting the TB-2708. Refer to the DAQ Getting Started Guide for instructions on installing your PXI device. 2. Guide the terminal block onto the PXI module connector. Caution Do not force the terminal block when inserting it into or removing it from the PXI
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Table 1. TB-2708 Signal Descriptions Signal Name Reference Direction Description AI <0..3> AI GND Input Analog Input channels 0 through 3. AO <0..1> AO GND Output Analog Output channels 0 and 1. PFI 0/AI Start Trig D GND Input As an input, this pin is a programmable function input (PFI). Output As an output, this pin is the AI Start Trigger signal. PFI 7/AI SAMP CLK D GND Input As an input, this pin is a PFI. Output As an output, this pin is the AI Sample Clock signal. CTR 0 OUT D GND Output
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Measuring Floating Signals You can use the TB-2708 to measure floating and ground-referenced analog input signals. To measure floating signal sources, move the switch located under the rubber-sealed door on the enclosure cover for the AI channel you are using to the ON (floating source) switch position. In the floating source switch position, the amplifier negative terminal connects to ground through a 5 k Ω resistor in parallel with a 0.1 μF capacitor. Table 2 shows the TB-2708 switch con
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Cabling Options This section describes the cabling options for accessing signals on the TB-2708. A 14-pin connector on the bottom of the TB-2708 provides access to digital I/O signals. Use the MFIT-Pigtail Cable Assembly (part number 194123-01) to access digital signals on the TB-2708. The MFIT-Pigtail Cable Assembly features a 14-pin I/O connector on one end and pigtail conductors on the other end. The pigtail conductors on the cable assembly can be used to terminate digital signals to th
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Table 3. TB-2708 Wiring Information for 14-Pos MFIT-Pigtail Cable Assembly (Part Number 194123-01) (Continued) Pin Number Wire Color Signal Name 5 Orange P0.3 6 Blue CTR 0 OUT 7 White/Black GND 8 Red/Black P0.4 9 Green/Black P0.5 10 Orange/Black P0.6 11 Blue/Black P0.7 12 Drain Wire CHASSIS GND 13 Red/White CTR 1 OUT 14 Green/White PFI 9 NC Blue/White — Table 4 lists the National Instruments cables available for connecting the TB-2708 to both analog and digital user signals. Table 4. TB-2708
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Specifications This section lists the specifications of the TB-2708. These specifications are typical at 25 °C unless otherwise specified. Input/Output Refer to the documentation for your PXI-6115/6120 S Series device to determine the input/output specifications for your application. Caution Do not apply an input voltage greater than 42 V /60 VDC to the TB-2708. Input pk voltages greater than 42 V /60 VDC can damage the TB-2708 and any device connected pk to it, including the host computer.
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Environment The NI TB-2708 is intended for indoor use only. Operating temperature ............................0 to 55 °C Storage temperature................................–20 to 70 °C Relative humidity ...................................10 to 90% noncondensing Pollution Degree .....................................2 Safety This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: � IEC 61010-1,
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National Instruments corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas, 78759-3504. National Instruments also has offices located around the world to help address your support needs. For telephone support in the United States, create your service request at ni.com/support and follow the calling instructions or dial 512 795 8248. For telephone support outside the United States, contact your local branch office: Australia 1800 300 800, Austria 43 662 457990-0,
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