National Instruments USB-6501 Bedienungsanleitung

USER GUIDE

NI USB-6501

24-Channel, 32-Bit Counter Digital I/O Device

The National Instruments USB-6501 is a Full Speed USB 2.0 device that provides 24 DIO

channels and a 32-bit counter. This user guide describes how to use the device.

For specifications, refer to the NI USB-6501 Device Specifications document available at

ni.com/manuals.

The following figure shows key functional components of the NI USB-6501.

Figure 1. NI USB-6501 Top and Back Views

2 2 4

NI USB-6501

24-line Digital I/O

1. USB Cable Strain Relief

2. Screw Terminal Connector Plug

3. LED Indicator

4. USB Connector

The following figure shows key functional components of the NI USB-6501.

Figure 2. NI USB-6501 Device Block Diagram

P1.<0..7>

P0.<0..7>

USB Microcontroller

USB

P2.<0..7>

Short Circuit Protection

Current Limiting Circuit

Digital I/O Terminal Block

Full Speed USB Interface

Vbus

Safety Guidelines

The following section contains important safety information that you must follow when

installing and using the NI USB-6501.

Caution Operate the NI USB-6501 only as described in these operating

instructions. Misuse of the device can result in a hazard. You can compromise the

safety protection built into the device if the device is damaged in any way. If the

device is damaged, contact National Instruments for repair.

Caution Do not substitute parts or modify the device except as described in this

user guide. Use the device only with the accessories specified in the installation

instructions.

Caution Do not operate the device in an explosive atmosphere or where there may

be flammable gases or fumes. If you must operate the device in such an

environment, it must be in a suitably rated enclosure.

If you need to clean the device, use a dry cloth. Make sure that the device is completely dry

and free from contaminants before returning it to service.

2| ni.com | NI USB-6501 User Guide

Operate the device only at or below Pollution Degree 2. Pollution is foreign matter in a solid,

liquid, or gaseous state that can reduce dielectric strength or surface resistivity. The following

is a description of pollution degrees:

• Pollution Degree 1 means no pollution or only dry, nonconductive pollution occurs. The

pollution has no influence.

• Pollution Degree 2 means that only nonconductive pollution occurs in most cases.

Occasionally, however, a temporary conductivity caused by condensation must be

expected.

• Pollution Degree 3 means that conductive pollution occurs, or dry, nonconductive

pollution occurs that becomes conductive due to condensation.

You must insulate signal connections for the maximum voltage for which the device is rated.

Do not exceed the maximum ratings for the device. Do not install wiring while the device is

live with electrical signals.

Operate the device at or below the Measurement Category I1. Measurement circuits are

subjected to working voltages2 and transient stresses (overvoltage) from the circuit to which

they are connected during measurement or test. Measurement categories establish standard

impulse withstand voltage levels that commonly occur in electrical distribution systems. The

following is a description of measurement categories:

• Measurement Category I is for measurements performed on circuits not directly

connected to the electrical distribution system referred to as MAINS3 voltage. This

category is for measurements of voltages from specially protected secondary circuits.

Such voltage measurements include signal levels, special equipment, limited-energy parts

of equipment, circuits powered by regulated low-voltage sources, and electronics.

• Measurement Category II is for measurements performed on circuits directly connected

to the electrical distribution system. This category refers to local-level electrical

distribution, such as that provided by a standard wall outlet (for example, 115 V for U.S.

or 230 V for Europe). Examples of Measurement Category II are measurements

performed on household appliances, portable tools, and similar E Series devices.

• Measurement Category III is for measurements performed in the building installation at

the distribution level. This category refers to measurements on hard-wired equipment

such as equipment in fixed installations, distribution boards, and circuit breakers. Other

examples are wiring, including cables, bus-bars, junction boxes, switches, socket-outlets

1Measurement Category is defined in electrical safety standard IEC 61010-1. Measurement

Category is also referred to as Installation Category.

2Working voltage is the highest rms value of an AC or DC voltage that can occur across any

particular insulation.

3MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably

rated measuring circuits may be connected to the MAINS for measuring purposes.

NI USB-6501 User Guide | © National Instruments | 3

in the fixed installation, and stationary motors with permanent connections to fixed

installations.

• Measurement Category IV is for measurements performed at the primary electrical

supply installation (<1,000 V). Examples include electricity meters and measurements on

primary overcurrent protection devices and on ripple control units.

Installing the Software

Software support for the NI USB-6501 is provided by NI-DAQmx or NI-DAQmx Base.

Back up any applications before upgrading your software. You must be an administrator to

install NI software on your computer. Refer to the NI-DAQmx Readme or the NI-DAQmx Base

Readme on the software media for supported application software and versions.

Complete the following steps to install software:

1. If applicable, install an application development environment (ADE), such as LabVIEW,

Microsoft Visual Studio, or LabWindows™/CVI™.

2. Install the NI-DAQmx driver or the NI-DAQmx Base driver.

Connecting the Device

Before installing the NI USB-6501, you must install the software you plan to use with it.

Complete the following steps to set up the NI USB-6501 device:

1. Install the combicon screw terminal blocks by inserting them into the combicon jacks.

2. Affix the provided signal labels to the screw terminal blocks, as shown in the following

figure. Once you label the connector plugs, you must only insert them into the matching

combicon jack, as indicated by the overlay label on the device.

4| ni.com | NI USB-6501 User Guide

Figure 3. Signal Name Label Application

NI USB-6501

24-line Digital I/O

GND +5V P1.7P1.6P1.5P1.4GND GNDP2.7P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0

1. Overlay Label with Pin Orientation Guides

2. Combicon Jack

3. Screw Terminal Connector Plugs

4. Signal Name Labels

3. Connect the wiring to the appropriate screw terminals.

4. Use the provided USB cable to connect the NI USB-6501 device to your computer.

Features

The NI USB-6501 features USB cable strain relief, an LED indicator, and two screw terminal

connector plugs for I/O.

USB Cable Strain Relief

You can provide strain relief for the USB cable by threading a zip tie through the USB cable

strain relief ring and tightening it around a looped USB cable, as shown in the following

figure.

NI USB-6501 User Guide | © National Instruments | 5

Figure 4. USB Cable Strain Relief

LED Indicator

The green LED next to the USB connector on the NI USB-6501 device indicates device status,

as listed in the following table. When the device is connected to a USB port, the LED blinks

steadily to indicate that the device is initialized and is receiving power from the connection.

Table 1. LED State/Device Status

LED State Device Status

Not lit Device is not connected or is in suspend mode

On, not blinking Device is connected but not initialized, or the computer is in standby

mode. In order for the device to be recognized, it must be connected to a

computer that has NI-DAQmx or NI-DAQmx Base installed.

Single-blink Device is operating normally

Screw Terminal Connector Plugs

The NI USB-6501 ships with two detachable screw terminal connector plugs for digital

signals. These screw terminal connectors accept 16 AWG to 28 AWG wire.

Device Pinout and Signal Descriptions

The following figure shows the digital terminal assignments.

6| ni.com | NI USB-6501 User Guide

Figure 5. NI USB-6501 Device Pinout

P0.0

P0.1

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

GND

P1.0

P1.1

P1.2

P1.3

+5V

GND

+5V

P1.7

P1.6

P1.5

P1.4

GND

P2.7/PFI 0

P2.6

P2.5

P2.4

P2.3

P2.2

P2.1

P2.0

GND +5V P1.3 P1.2P1.1 P1.0GND GNDP0.7P0.6 P0.5 P0.4 P0.3P0.2 P0.1 P0.0

GND +5V P1.7 P1.6P1.5 P1.4GND GND P2.7P2.6 P2.5 P2.4 P2.3P2.2 P2.1 P2.0

The following table describes the signals available on the I/O connectors.

Table 2. Signal Descriptions

Signal Name Direction Description

P0.<0..7>,

P1.<0..7>,

P2.<0..6>

Input or Output Digital I/O Signals: You can individually configure

each signal as an input or output.

P2.7/PFI 0 Input or Output This pin is configurable as either a digital line or an

event counter.

Digital I/O Signal: As a digital line, this signal can be

used as an input or output.

CTR: As a counter, this signal can be used as an event

counter input source.

NI USB-6501 User Guide | © National Instruments | 7

Table 2. Signal Descriptions (Continued)

Signal Name Direction Description

+5 V Output The voltage source provided by the USB host. The

voltage is nominally 5 V, but varies from system to

system.

GND — Ground: The reference for the digital signals and the

+5 VDC supply.

Digital I/O

The NI USB-6501 device has 24 single-ended digital lines that comprise the three DIO ports:

P0.<0..7>, P1.<0..7>, and P2.<0..7>. P2.7/PFI 0 can also function as a 32-bit event counter.

Static DIO

Each DIO line can be individually programmed as a static DI or DO line. You can use static

DIO lines to monitor or control digital signals. All samples of static DI lines and updates of

DO lines are software-timed.

Digital Output

The following table shows the correlation between terminology used for hardware

functionality and for NI-DAQmx.

Table 3. Hardware and NI-DAQmx Terminology

Hardware Functionality NI-DAQmx Terminology

Open-drain Open collector

Push-pull Active drive

The default configuration of the NI USB-6501 DIO ports is open collector, allowing 5 V

operation, with an onboard 4.7 kΩ pull-up resistor. An external, user-provided pull-up resistor

can be added to increase the source current drive up to a 8.5 mA limit per line, as shown in the

following figure.

8| ni.com | NI USB-6501 User Guide

Figure 6. Example of Connecting an External, User-Provided Resistor

GND

P0.0

+5 V

VBus

4.7KΩOnboard Resistor

Load

Short Circuit Protection

Current Limiting Circuit

Port Pad

External

Pull-Up

Resistor

Additionally, you can configure the DIO ports as active drive. When configured as active

drive, the total current sourced by all DO lines simultaneously should not exceed 65 mA.

Determining the Pull-Up Resistor Value

Complete the following steps to determine the value of the user-provided pull-up resistor:

1. Place an ammeter in series with the load

2. Place a variable resistor between the digital output line and the +5 V.

3. Adjust the variable resistor until the ammeter current reads as the intended current. The

intended current must be less than 8.5 mA.

4. Remove the ammeter and variable resistor from your circuit.

5. Measure the resistance of the variable resistor. The measured resistance is the ideal value

of the pull-up resistor.

6. Select a static resistor value for your pull-up resistor that is greater than or equal to the

ideal resistance.

7. Reconnect the load circuit and the pull-up resistor.

Digital I/O Circuitry

The following figure shows some common examples of connections of DIO lines with

standard circuits. In the figure, P0.<0..7> is connected to example signals configured as digital

inputs and digital outputs. You can configure P1.<0..7> and P2.<0..7> similarly.

NI USB-6501 User Guide | © National Instruments | 9

Figure 7. Example of Connecting a Load

+5 V

LED

Switch

I/O Connector

GND

P0.0

P0.1

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

+5 V

LED

TTL Signal

1. P0.0 configured as an open collector digital output

driving an LED

2. P0.2 configured as a active drive digital output

driving an LED

3. P0.4 configured as a digital input receiving a TTL

signal from a gated inverter

4. P0.7 configured as a digital input receiving a 0 V

or 5 V signal from a switch

Caution Exceeding the maximum input voltage ratings or maximum output ratings

listed in the device specifications can damage the DAQ device and the computer.

National Instruments is not liable for any damage resulting from such signal

connections.

I/O Protection

Each DIO signal is protected against overvoltage, undervoltage, and overcurrent conditions, as

well as ESD events. However, you should avoid these fault conditions by using the following

guidelines:

• If you configure a DIO line as an output, do not connect it to any external signal source,

ground signal, or power supply.

• If you configure a DIO line as an output, understand the current requirements of the load

connected to these signals. Do not exceed the specified current output limits of the DAQ

device.

• If you configure a DIO line as an input, do not drive the line with voltages outside of its

normal operating range.

• Treat the DAQ device as you would treat any static-sensitive device. Always properly

ground yourself and the equipment when handling the DAQ device or connecting to it.

10 | ni.com | NI USB-6501 User Guide

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