Industrial Digital I/O Device for USB –
60 V, Channel-to-Channel Isolated
NI USB-6525
• Small, portable digital I/O device
• Eight channel-to-channel optically
isolated inputs (±60 VDC)
• Eight channel-to-channel optically
isolated, solid-state relay outputs
(60 VDC/30 V
rms
max)
• 500 mA maximum switching current
per channel
• One 32-bit event counter
• Full-speed USB (12 Mb/s) bus interface
• Built-in, removable connectors for
easy connectivity
• USB cable strain relief
Operating Systems
• Windows Vista/XP/2000
Recommended Software
•
•
•
•
LabVIEW
LabWindows
™
/CVI
Measurement Studio
LabVIEW SignalExpress
Other Compatible Software
• Visual Studio .NET
• C, C++
• Visual Basic
Measurement Services
Software (included)
• NI-DAQmx driver software
• Measurement & Automation Explorer
configuration utility
• LabVIEW SignalExpress LE
data-logging software
Product
NI USB-6525
Digital Inputs
8
Low Threshold
1 VDC
High Threshold
3.2 VDC
Input Current
3 mA/ch
SSR Outputs
8
Switching Current
500 mA
Max Signal Range
±60 VDC
Isolation
Ch-to-Ch
32-Bit Counters
1
Table 1. NI USB-6525 Specifications Overview
Overview and Applications
The National Instruments USB-6525 is a full-speed USB device with
eight normally open, channel-to-channel isolated, solid-state relay
outputs and eight ±60 VDC channel-to-channel isolated digital inputs.
The NI USB-6525 offers features for industrial control and manufacturing
test applications, such as factory automation, embedded machine
control, and production line verification. The solid-state relay outputs
have a 60 VDC/30 V
rms
switching voltage and 500 mA/ch maximum
switching current, making them ideal for controlling pumps, valves,
motors, and other industrial actuators. The eight isolated digital input
channels break ground loops and offer protection from noise and spikes
on external signals. You can also use one of the digital input channels as
a 5 kHz, 32-bit event counter for counting digital pulses.
PFI 0 (an alias to P1.7) can also function as the source for a 32-bit
counter. In this mode, the device counts low to high transitions on P1.7.
You can arm and disarm the counter as well as read or reset the count
through software.
You can connect loads to the solid-state relay outputs with an AC or
DC power source. The default power-on state of the solid-state relays is
open. The relays also remain open when the computer and the USB-6525
device are powered off.
Module
Terminal
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Signal
P0.0A
P0.0B
P0.1A
P0.1B
P0.2A
P0.2B
P0.3A
P0.3B
P0.4A
P0.4B
P0.5A
P0.5B
P0.6A
P0.6B
P0.7A
P0.7B
Module
Terminal
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Signal
P1.0+
P1.0-
P1.1+
P1.1-
P1.2+
P1.2-
P1.3+
P1.3-
P1.4+
P1.4-
P1.5+
P1.5-
P1.6+
P1.6-
P1.7+/PFI 0+
P1.7-/PFI 0-
Hardware
The 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>. The isolated inputs consist of an optocoupler, a
depletion-mode MOSFET-based current-limiting circuit, and a Schottky
diode. Each channel has its own positive and negative terminals capable
of detecting a wide range of DC signals, from 5 V TTL logic levels to DC
power supply levels up to 60 V.
Table 2. NI USB-6525 Pinout
NI [ NATIONAL INSTRUMENTS CORPORATION ]
