National Instruments SCC-FT01 Manuale utente

USER GUIDE

SCC-FT01 Feedthrough Module

The SCC-FT01 is a feedthrough module that connects directly to the

analog input (AI) and analog output (AO) channels of a data acquisition

(DAQ) device. You can use the breadboard area of the SCC-FT01 to

develop custom signal-conditioning circuitry that can connect to and

condition any of the analog, digital (P0.), and general-purpose

counter/timer (CTR) channels of E Series DAQ devices.

Conventions

The following conventions are used in this guide:

<> Angle brackets that contain numbers separated by an ellipsis represent

a range of values associated with a bit or signal name—for example,

AI <0..7>.

»The »symbol leads you through nested menu items and dialog box options

to a final action. The sequence File»Page Setup»Options directs you to

pull down the File menu, select the Page Setup item, and select Options

from the last dialog box.

This icon denotes a note, which alerts you to important information.

This icon denotes a caution, which advises you of precautions to take to

avoid injury, data loss, or a system crash. When this symbol is marked on

the product, refer to the Read Me First: Safety and Radio-Frequency

Interference document, shipped with the product, for precautions to take.

When symbol is marked on a product it denotes a warning advising you to

take precautions to avoid electrical shock.

When symbol is marked on a product it denotes a component that may be

hot. Touching this component may result in bodily injury.

bold Bold text denotes items that you must select or click in the software, such

as menu items and dialog box options. Bold text also denotes parameter

names.

SCC-FT01 Feedthrough Module User Guide 2 ni.com

italic Italic text denotes variables, emphasis, a cross reference, a hardware label,

or an introduction to a key concept. This font also denotes text that is a

placeholder for a word or value that you must supply.

monospace Text in this font denotes text or characters that you should enter from the

keyboard, sections of code, programming examples, and syntax examples.

This font is also used for the proper names of disk drives, paths, directories,

programs, subprograms, subroutines, device names, functions, operations,

variables, filenames, and extensions.

SC-2345 SC-2345 refers to both the SC-2345 connector block and the SC-2345 with

configurable connectors.

SCC SCC refers to any SCC series signal conditioning module.

What You Need to Get Started

To set up and use the SCC-FT01, you need the following items:

❑SC-2345/2350 with one of the following:

–SCC-PWR01

– SCC-PWR02 and the PS01 power supply

– SCC-PWR03 (requires a 7 to 42 VDC power supply, not included)

❑One or more SCC-FT01 modules

❑SCC-FT01 Feedthrough Module User Guide

❑SC-2345/2350 User Manual, available at ni.com

❑SCC Quick Start Guide, available at ni.com

❑Read Me First: Safety and Radio-Frequency Interference

❑SC-2345 Quick Reference Label

❑68-pin E Series DAQ device, documentation, and 68-pin cable of

1 or 2 m length

❑1/8 in. flathead screwdriver

❑Numbers 1 and 2 Phillips screwdrivers

©National Instruments Corporation 3 SCC-FT01 Feedthrough Module User Guide

❑Wire insulation strippers

❑NI-DAQ (current version) for Windows 2000/NT/XP/Me

If you do not have the current version of NI-DAQ or one of the

documents, you can download them from ni.com, or contact an

NI sales representative.

Note Software scaling of measurements is not supported on the Macintosh operating

system.

Device Specific Information

Note For general SCC module installation and signal connection information, and

information about the SC-2350 carrier, refer to the SCC Quick Start Guide, available

for download at ni.com/manuals.

Installing the Module

Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document

before removing equipment covers or connecting/disconnecting any signal wires.

Caution If you plug the unmodified SCC-FT01 into any SCC socket other than

single-stage AI (sockets J1 through J8) or AO (sockets J17 and J18), you can damage

the E Series DAQ device.

You can plug the SCC-FT01, as shipped, into an AI or AO socket on the

SC-2345. When used as a prototyping module, the SCC-FT01 plugs into

any socket on the SC-2345 except the power socket.

Five 0 Ωresistors on the printed circuit board (PCB) connect a set of default

signals listed on the module label. To modify the SCC-FT01 to perform

custom signal conditioning, refer to the Customizing the SCC-FT01

section.

Connecting the Input Signals

Note The signal names have changed. Refer to ni.com/info and enter rdtntg to

confirm the signal names.

The screw terminals are labeled by pin number <1..6>. The module label

lists the signal names beside the pin numbers. Pins 2 through 6 accept the

following signals: CH+, CH–, AI GND, AI SENSE, and EXT REF. Pin 1

does not connect to anything. Connect the wires accordingly.

SCC-FT01 Feedthrough Module User Guide 4 ni.com

Table 1 shows the signals available if you plug the SCC-FT01 into

AI single-stage SCC sockets J1–J8 or AO SCC sockets J17 and J18.

When you plug the SCC-FT01 into a single-stage AI SCC socket, the

following conditions are true for the labeled screw terminals:

• CH+ connects to the lower AI channel number CH(X), where

Xis 0 to 7.

• CH– connects to the higher AI channel number CH(X+8), where

Xis 0 to 7.

• AI GND connects to AI ground.

• AI SENSE connects to AI SENSE.

• EXT REF does not connect—do not use it.

Note For information on AI modes, refer to the SC-2345 User Manual. For information

on AI configuration modes, refer to the DAQ device documentation.

When you plug the SCC-FT01 into an AO SCC socket, the following

conditions are true for the labeled screw terminals:

• CH+ connects to AO 0 for AO SCC socket J17, AO1 for

AO SCC socket J18.

• CH– connects to AO ground.

• AI GND connects to PFI 5.

• AI SENSE connects to AO 1 for AO SCC socket J17, AO 0 for

AO SCC socket J18.

• EXT REF connects to EXT REF.

Table 1. SCC-FT01 Signals

Screw

Terminal

Number

Screw

Terminal Label

AI Single-Stage

SCC Socket

J1–J8

AO SCC

Socket J17

AO SCC

Socket J18

6CH+ AI AO 0 AO 1

5CH– AI +8 AO GND AO GND

4AI GND AI GND PFI 5 PFI 5

3AI SENSE AI SENSE AO 1 AO 0

2EXT REF —EXT REF EXT REF

1NO CONNECT — — —

©National Instruments Corporation 5 SCC-FT01 Feedthrough Module User Guide

When you configure the SC-2345 as an accessory to the E Series DAQ

device in Measurement & Automation Explorer (MAX), the program

automatically configures the SC-2345 in nonreferenced single-ended

(NRSE) mode. Connect the signal source to single-ended channels on the

SCC-FT01 while the SC-2345 is configured in the NRSE AI configuration.

You can configure the E Series DAQ device to read signals from the

SCC-FT01 in differential mode. Use a virtual channel in MAX or

application software to configure the E Series DAQ device to read the

signal in differential mode. When you read a signal in differential mode,

you use two channels for one measurement, but you avoid ground loops and

get a better signal by rejecting common-mode signal noise.

You can configure the E Series DAQ device on a per channel basis with

application software or virtual channels. For example, you can have

channels 0 and 8 in differential mode and 1 to 7 and 9 to 15 in NRSE mode.

Refer to the Measurement & Automation Explorer Help for more

information and instructions on configuring channels.

For more information about configuring the SCC-FT01 using NI-DAQmx,

refer to the SCC Quick Start Guide.

Customizing the SCC-FT01

You can customize the SCC-FT01 to connect to any of the AI, AO, digital

input/output, or counter signals of the E Series DAQ device. After you

customize the SCC-FT01, you can plug it into any SCC socket on

the SC-2345 except the SCC power socket. The SCC-FT01 PCB

contains 2.54 sq cm (1 sq in.) of prototyping breadboard area. This area

accommodates as many as four 8-pin integrated circuits and other discrete

components such as resistors and capacitors.

Place the SCC-FT01 prototyping module label, which is included in the kit,

over the SCC-FT01 feedthrough module label on the SCC enclosure. This

label does not contain signal names, so you can customize the assignment

of the screw terminals.

Circuit Design

You must disassemble the SCC-FT01 to install custom circuitry.

Complete the following steps to open the module.

1. Remove the screw from the back (wide unlabeled side).

2. Turn the front (wide labeled side) toward you.

3. Place the screw terminal receptacle on the left.

SCC-FT01 Feedthrough Module User Guide 6 ni.com

4. Slide the top cover to the right.

5. Lift off the cover.

You must remove resistors R1 through R5, shown in Figure 1, before you

develop custom circuitry. The signal connection pads above connector J2,

represented by item 1 in Figure 1, connect to different signals on the

E Series DAQ device, depending on where you install the SCC-FT01 on the

SC-2345.

Figure 1. SCC-FT01 Parts Locator Diagram

Table 2 shows the signals available for circuit design when you plug the

SCC-FT01 into each type of SCC socket on the SC-2345. The pad numbers

correspond to the number next to each pad on the SCC-FT01.

1 I/O Pads

2 Prototyping Breadboard Area

3 Signal Connection Pads

4 R1 through R5

Table 2. Signals Available by SCC Socket Type

Pad

Number

Signal Name

AI/P0. All AO CTR CH0 CTR CH1

1AI SENSE –15 V EXT REF PFI 8/

CT R0 SOURCE

PFI 3/

CTR 1 SOURCE

2AI + REF 5 V J17—AO 1

J18—AO 0

PFI 6/

AO START TRIG

AI – Cascaded

REF1

EXTSTROBE*

AI – Cascaded

REF1

1 2 3

©National Instruments Corporation 7 SCC-FT01 Feedthrough Module User Guide

Note AO GND (A) and AO GND (B) are both in the table, but both connect to the one

AO GND signal on the E Series DAQ device.

An SCC-FT01 signal connection label, which defines the pad numbers

on the SCC-FT01 board, is attached to the inside of the enclosure of the

SCC module.

Whether you plug the SCC-FT01 into an SCC socket for AI, AO, digital,

or counter conditioning, the pads listed under the All column in Table 2 are

connected, and you can use them.

3AI GND GND (+5 V) AO GND(B) N/A

AI + Cascaded

REF1

PFI 1/AI REF

TRIG

AI + Cascaded

REF1

4PFI 7/

AI SAMPLE C

LK or

P0.(X)2

+15 V AO GND(A) FREQ OUT FREQ OUT

5AI – GND (15 V

and REF 5 V)

J17—AO 0

J18—AO 1

PFI 5/

AO SAMP

CLOCK

AI HOLD COMP

6AI + Cascaded3+5 V PFI 6/

AO START TRIG

P0.6 P0.7

7AI – Cascaded3—PFI 5/

AO SAMP CLOCK

PFI 0/

AI START TRIG

PFI 0/

AI START TRIG

8AI SENSE

Cascaded3— — — PFI 7/

AI SAMP CLK

9— — — PFI 9/

CTR 0 GATE

PFI 4/

CTR 1 GATE

10 — — — CTR 0 OUT CTR 1 OUT

1Not a counter signal name. Available on any AI SCC socket J1 to J8.

2Available on digital SCC sockets (J9 to J16) only.

3Available on final-stage AI SCC sockets (J1 to J8) only.

Table 2. Signals Available by SCC Socket Type (Continued)

Pad

Number

Signal Name

AI/P0. All AO CTR CH0 CTR CH1

SCC-FT01 Feedthrough Module User Guide 8 ni.com

Wiring the SCC-FT01

The signal names in the following sections refer to the signals listed in

Table 2.

Note When you plug the SCC-FT01 into the first-stage AI sockets on the SC-2345, you

do not connect the outputs of the circuitry to the pads labeled Cascaded. Use pads labeled

Cascaded only when you plug the SCC-FT01 into the second-stage (final-stage) socket to

get the input signals through the SC-2345 from the first-stage socket. Refer to Figures 2a

and 2b.

Figure 2. SCC-FT01 Prototyping Module AI Configurations

Figures 2a and 2b illustrate example wiring for the SCC-FT01 prototyping

module used in dual-stage AI configuration. Figure 2c illustrates

single-stage AI configuration.

Analog Input and Digital Input/Output

To use the SCC-FT01 for AI or digital signal conditioning, use the pads

above connector J2 labeled AI/P0. for connections to the breadboard area.

You then can plug the module into any AI SCC socket J1 to J16 on the

SC-2345. The signals available are slightly different when the module is

plugged into the first-stage AI (also known as digital) than when plugged

into the second-stage AI (also known as single-stage AI). Use SCC sockets

J9 to J16 for first-stage AI. Use SCC sockets J1 to J8 for second-stage AI.

a. First-Stage Analog Input Mode

AI +

AI GND

SCC-FT01 Prototype

b. Second-Stage Analog Input Mode

AI +

AI GND

AI + Cascaded

AI + Cascaded REF

SCC-FT01 Prototype

Prototyping

Circuit

c. Single-Stage Analog Input Mode

6AI +

AI GND

SCC-FT01 Prototype

AI –

©National Instruments Corporation 9 SCC-FT01 Feedthrough Module User Guide

PFI 7/AI SAMP CLK, AI + Cascaded, AI + Cascaded REF,

AI – Cascaded, AI – Cascaded REF, and AI SENSE Cascaded signals are

available for the second-stage AI SCC sockets only. The P0.(X) signal is

available for the first-stage AI SCC sockets only. Refer to Table 2 for pad

definitions.

When the E Series DAQ device is configured in NRSE AI mode, design

your prototype circuitry so that the output of the SCC-FT01 to the E Series

DAQ device is referenced single-ended to AI GND on the SC-2345.

Note On the SC-2345, the AI GND and AI SENSE signals join at connector J24.

Analog Output

To use the SCC-FT01 for AO signal conditioning, use the pads above

connector J2 labeled AO for connections to the breadboard area. The

AO column in Table 2 lists the signals available to each pad. Plug the

SCC-FT01 into any AO socket on the SC-2345.

The AO 0 and AO 1 signals depend on which AO SCC socket you use.

If you plug the SCC-FT01 into the AO SCC socket J17, the DAC (A) pad

connects to AO 0 and the DAC (B) pad to AO 1 on the E Series DAQ

device. These pad connections are reversed when the SCC-FT01 is plugged

into AO SCC socket J18, and the DAC (A) pad connects to AO 1 and

DAC (B) pad to AO 0 on the E Series DAQ device.

Counter

To use the SCC-FT01 for CTR functions, use the pads above connector J2

labeled CTR for connections to the breadboard area. The CTR CH0 and

CTR CH1 columns in Table 2 list the signals available to each pad. The

signals available depend on which SCC socket you use.

If you plug the SCC-FT01 into the CTR CH0 socket J19, the pads under

CTR CH0 on the board connect to signals associated with CTR channel 0

and AO of the E Series DAQ device. When the SCC-FT01 is plugged into

the CTR CH1 socket J20, the pads under CTR CH1 on the board connect

to signals associated with CTR channel 1 and AI of the E Series DAQ

device.

SCC-FT01 Feedthrough Module User Guide 10 ni.com

Connecting the Screw Terminals

The pads next to connector J1 connect to each input of the screw terminal

connector. Use these pads to connect the external signals to the circuitry

you added in the breadboard area. The numbers next to each hole

correspond to the screw terminal numbers. Space is available on the

SCC-FT01 prototyping module label for custom signal names.

For information about how to configure the SCC-FT01 module using

NI-DAQmx, refer to the SCC Quick Start Guide.

Specifications

These ratings are typical at 25 °C unless otherwise stated.

Analog

Number of input channels.......................1 DIFF or 2 SE (when plugged

into an AI socket on the SC-2345)

Number of output channels.....................1 (when plugged into an

AO socket on the SC-2345)

Power Requirement

No power required (if unmodified)

Physical

Dimensions .............................................8.89 cm ×2.92 cm ×1.85 cm

(3.50 in. ×1.15 in. ×0.73 in.)

I/O connectors.........................................20-pin right-angle male connector

6-pin screw terminal system

Screw terminal........................................28 to 16 AWG

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, EN 61010-1

• UL 3111-1, UL 61010B-1

• CAN/CSA C22.2 No. 1010.1

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