National Instruments USB-6525 Manuale utente

National Instruments USB-6525 Manual

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USER GUIDE AND SPECIFICATIONS

NI USB-6525

This user guide describes how to use the National Instruments USB-6525

data acquisition (DAQ) device.

Introduction

The NI USB-6525 is a full-speed USB 2.0 device that provides

eight ±60 VDC channel-to-channel isolated digital inputs (DI),

eight 60 VDC/30 Vrms channel-to-channel isolated solid-state relay (SSR)

outputs, and a 32-bit counter.

Figure 1. USB-6525 Top View

1 USB Cable Strain Relief

USB-6525 User Guide and Specifications 2 ni.com

Figure 2. USB-6525 Back View

Installing Software

Software support for the USB-6525 for Windows 2000/XP is provided by

NI-DAQmx.

The NI-DAQmx CD contains example programs that you can use to get

started programming with the USB-6525. Refer to the NI-DAQmx for USB

Devices Getting Started Guide, that shipped with your device and is also

accessible from Start»All Programs»National Instruments»NI-DAQ

for more information.

Note For information about non-Windows operating system support, refer to ni.com/

info and enter rddqld.

Hardware

The block diagram in Figure 3 shows key functional components of the

USB-6525.

Figure 3. USB-6525 Block Diagram

P0.<0..7>A/B

P1.<0..7>+/–

Digital I/O Terminal Block

Vbus

Full-Speed USB Interface

USB

SSRs

USB Microcontroller

Current-

Limiting

Isolated

Inputs

©National Instruments Corporation 3 USB-6525 User Guide and Specifications

Refer to the Safety Guidelines section of this document for important safety

information.

Setting Up Hardware

Complete the following steps to set up the hardware:

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

combicon jacks.

Note The USB-6525 kit ships with signal labels. You can apply the signal labels on the

screw terminal blocks for easy signal identification.

2. Refer to Table 1 and Figure 4 for label orientation and affix provided

signal labels to the screw terminal blocks. Insert the screw terminal

blocks into their respective matching combicon jacks. Refer to

Figure 4 for more information about signal label orientation.

Figure 4. Signal Label Application Diagram

3. Connect the wiring to the appropriate screw terminals.

1 Overlay Label with Pin Orientation Guides

2 Combicon Jack

3 Screw Terminal Blocks

4 Signal Labels

USB-6525 User Guide and Specifications 4 ni.com

I/O Connector

The USB-6525 device ships with two detachable terminal blocks for digital

signals. Each individual terminal accepts a wire gauge between

16 AWG–28 AWG.

Table 1. Digital Terminal Assignments

Module Terminal Signal Module Terminal Signal

1P0.0A 17 P1.0+

2P0.0B 18 P1.0–

3P0.1A 19 P1.1+

4P0.1B 20 P1.1–

5P0.2A 21 P1.2+

6P0.2B 22 P1.2–

7P0.3A 23 P1.3+

8P0.3B 24 P1.3–

9P0.4A 25 P1.4+

10 P0.4B 26 P1.4–

11 P0.5A 27 P1.5+

12 P0.5B 28 P1.5–

13 P0.6A 29 P1.6+

14 P0.6B 30 P1.6–

15 P0.7A 31 P1.7+/PFI 0+

16 P0.7B 32 P1.7–/PFI 0–

©National Instruments Corporation 5 USB-6525 User Guide and Specifications

Signal Descriptions

Table 2 describes the signals available on the I/O connectors.

Features

The NI 6525 features digital filtering, change detection, programmable

power-up output states, and a watchdog timer.

Digital Filtering

Use the digital filter option available on the NI 6525 input lines to eliminate

glitches on input data. When used with change detection, filtering can also

reduce the number of changes to examine and process.

You can configure the digital input channels to pass through a digital filter,

and you can program the filter interval the filter uses. The filter blocks

pulses that are shorter than half of the specified filter interval and passes

pulses that are longer than the specified interval. Intermediate-length

pulses—pulses longer than half of the interval but less than the

interval—may or may not pass the filter.

The filter operates on the inputs from the optocouplers. The optocouplers

turn on faster than they turn off, passing rising edges faster than falling

Table 2. Signal Descriptions

Signal Name Direction Description

P0.<0..7>A/B Output Solid-state relay 60 VDC/30 Vrms (42.4 Vpk) output

P1.<0..6>+/– Input ±60 VDC digital input.

P1.<0..6>+ corresponds to the positive input terminal.

P1.<0..6>– corresponds to the negative input terminal.

P1.7+/– or PFI 0+/– Input This channel is configurable as either a digital input or

an event counter.

Digital Input Signal—±60 VDC digital input.

P1.7+ corresponds to the positive input terminal.

P1.7– corresponds to the negative input terminal.

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

counter input source.

PFI 0+ corresponds to the positive counter terminal.

PFI 0– corresponds to the negative counter terminal.

USB-6525 User Guide and Specifications 6 ni.com

edges. The optocouplers can therefore subtract up to 150 μs from a low

pulse.

Table 3 lists the pulse widths guaranteed to be passed and blocked.

You can enable filtering on as many input lines as is necessary for your

application. All filtered lines share the same timing interval, which ranges

from 120 μs to 2600 ms.

Internally, the filter uses two clocks: the sample clock and the filter clock.

The sample clock has a 40 μs period1. The filter clock is generated by a

counter and has a period equal to one half of the specified timing interval.

The input signal is sampled on each rising edge of the sample clock, which

is every 40 μs1. A change in the input signal is recognized only if it

maintains its new state for at least two consecutive rising edges of the filter

clock.

The filter clock is programmable and allows you to control how long a

pulse must last to be recognized. The sample clock provides a fast sample

rate to ensure that input pulses remain constant between filter clocks.

Table 3. NI 6525 Digital Filtering

Filter Interval

Pulse Width Passed Pulse Width Blocked

Low Pulse High Pulse Low Pulse High Pulse

tinterval tinterval + 150 μs tinterval tinterval/2 (tinterval/2) – 150 μs

1 The accuracy of the sample clock is ±1.5%.

©National Instruments Corporation 7 USB-6525 User Guide and Specifications

Digital Filtering Example

Figure 5 shows a filter configuration with a tinterval filter interval

(tinterval/2 filter clock).

Figure 5. Digital Filtering Example

In periods A and B, the filter blocks the glitches because the external signal

does not remain steadily high from one rising edge of the filter clock to the

next. In period C, the filter passes the transition because the external signal

remains steadily high. Depending on when the transition occurs, the filter

may require up to two filter clocks—one full filter interval—to pass a

transition. The figure shows a rising (0 to 1) transition. The same filtering

applies to falling (1 to 0) transitions.

Change Detection

You can program the NI 6525 to send an interrupt when a change occurs on

any input line.

The NI 6525 can monitor changes on selected input lines or on all input

lines. It can monitor for rising edges (0 to 1), falling edges (1 to 0), or both.

When an input change occurs, the NI 6525 generates an interrupt, and the

NI-DAQ driver then notifies the software.

Note Excessive change detections can affect system performance. Use digital filtering to

minimize the effects of noisy input lines.

The NI 6525 sends a change detection when any one of the changes occurs,

but it does not report which line changed or if the line was rising or falling.

After a change, you can read the input lines to determine the current line

states. The maximum rate of change detection is determined by the

software response time, which varies from system to system.

HHHHH

HLLHH

Sample Clock

External

Signal

Sampled

Filtered

Signal

External

Signal

Filter

Clock

USB-6525 User Guide and Specifications 8 ni.com

An overflow bit indicates that an additional rising or falling edge has been

detected before the software could process the previous change.

Refer to the software documentation for information about how to set up

and implement the change detection.

Change Detection Example

Table 4 shows a change detection example for six bits of one port.

This example assumes the following line connections:

• Bits 7, 6, 5, and 4 are connected to data lines from a four-bit TTL

output device. The NI 6525 detects any change in the input data so you

can read the new data value.

• Bit 1 is connected to a limit sensor. The NI 6525 detects rising edges

on the sensor, which correspond to over-limit conditions.

• Bit 0 is connected to a switch. The software can react to any switch

closure, which is represented by a falling edge. If the switch closure is

noisy, enable digital filtering for this line.

In this example, the NI 6525 reports rising edges only on bit 1, falling edges

only on bit 0, and rising and falling edges on bits 7, 6, 5, and 4. The NI 6525

reports no changes for bits 3 and 2. After receiving notification of a change,

you can read the port to determine the current values of all eight lines. You

cannot read the state of any lines that are configured for change detection

until the change detection interrupt occurs.

Table 4. Change Detection Example

Bit

76543210

Changes to detect — —

Enable rising-edge

detection

yes yes yes yes no no yes no

Enable falling-edge

detection

yes yes yes yes no no no yes

©National Instruments Corporation 9 USB-6525 User Guide and Specifications

Programmable Power-Up Output States

The default power-up state of the digital output lines is logic low, which

opens the solid-state relays. The lines on output ports are user-configurable

for logic high (closed relay) or logic low (open relay). User-configurable

power-up states are useful for ensuring that the NI 6525 powers up in a

known state.

To use MAX (recommended) to program the power-up states, select

the device and click the Properties button. Refer to the software

documentation for information about how to program the power-up states

using NI-DAQ with LabVIEW or other National Instruments application

development environments (ADEs).

Watchdog Timer

The watchdog timer is a software configurable feature used to set critical

outputs to safe states in the event of a software failure, a system crash, or

any other loss of communication between the application and the NI 6525.

When the watchdog timer is enabled, if the NI 6525 does not receive a

watchdog reset software command within the time specified for the

watchdog timer, the outputs go to a user-defined safe state and remain in

that state until the watchdog timer is disarmed by the application and new

values are written, the NI 6525 is reset, or the computer is restarted. The

expiration signal that indicates an expired watchdog will continue to assert

until the watchdog is disarmed. After the watchdog timer expires, the

NI 6525 ignores any writes until the watchdog timer is disarmed.

You can set the watchdog timer timeout period to specify the amount of

time that must elapse before the watchdog timer expires. The counter on the

watchdog timer is configurable up to (232 – 1) × 40 μs1before it expires.

Digital I/O

USB-6525 has eight channel-to-channel optically isolated inputs,

P1.<0..7>, and eight channel-to-channel optically isolated solid-state relay

outputs, P0.<0..7>. P1.7/PFI 0 can also function as a 32-bit counter. Refer

to the Event Counter section for more information about the counter.

Optically Isolated Inputs

The USB-6525 provides eight channels of isolated digital inputs. These

inputs consist of an optocoupler, a depletion-mode MOSFET-based

current-limiting circuit, and Schottky diode.

1 The accuracy of the sample clock is ±1.5%.

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