Low-Cost Industrial Digital I/O –
60 V, Channel-to-Channel Isolated
NI PCI-6520
• 8 channel-to-channel optically isolated
inputs, ±30 VDC
• 8 nonlatching mechanical relay outputs
• ±60 V switching voltage with maximum
switching current of 2 A and maximum
switching power of 60 W
• High-reliability industrial feature set,
includes: isolation, programmable
power-up states, digital filtering,
watchdog timers, and change detection
• NI measurement services software for
highest productivity and performance
Operating Systems
• Windows 2000/NT/XP
• LabVIEW Real-Time
Recommended Software
• LabVIEW
• LabWindows/CVI
• Measurement Studio
Other Compatible Software
• C, C++
• Microsoft Visual Studio .NET 2003
Measurement Services Software
(included)
• NI-DAQmx driver, version 7.5 or higher
INPUT
Product
NI 6520
Bus
PCI
Inputs
8
Isolation
Channel-to-channel
Low
Threshold
±4 VDC
High
Threshold
±11 VDC
OUTPUT
Mechanical Relay
Max Voltage
Outputs
8
±60 VDC, 42.5 V
p
, ±30V
rms
Max
Current
2A
Max
Power
60 W
Industrial
Feature Set
Table 1. NI 6520 Specifications Overview
Overview and Applications
The National Instruments PCI-6520 is an industrial digital I/O board with
eight channel-to-channel isolated digital inputs and eight nonlatching
mechanical relay outputs. You can use the eight differential, isolated,
±30 VDC digital inputs to read the status of sensors, actuators, and logic
devices. You can use the bipolar digital input channels to read from both
sinking and sourcing devices. The NI PCI-6520 registers a logic low if the
voltage is between ±4 V, and registers a logic high if the voltage is less
than -11 V or greater than +11 V.
The PCI-6520 device offers three single-pole double-throw (SPDT)
Form C relays and five single-pole single-throw (SPST) Form A relays.
You can use the PCI- 6520 relay outputs to switch devices requiring up to
60 VDC or 30 Vrms with maximum current of 2 A and maximum
switching power of 60 W.
Note:
The switching current is limited by the maximum switching power
and maximum voltage (current = power/voltage).
The PCI-6520 configuration is completely programmable and does not
require setting up jumpers or DIP switches. This board is ideal for use
with a programmable automation controller (PAC) for automotive test,
industrial monitoring, and control applications. With high-current drive,
high-voltage outputs, and isolation, you can connect the digital I/O
module directly to a wide array of industrial electronic devices, sensors,
and actuators.
The PCI-6520 takes advantage of NI measurement services software to
speed up application development, with the NI-DAQmx driver software
(version 7.5 or higher) and many helpful features such as DAQ Assistant,
automatic code generation, and high-performance multithreaded
streaming technology.
Hardware
High-Reliability Industrial Feature Set
The PCI-6520 offers a set of high-reliability features designed for
demanding automation applications:
• Isolation provides an extended voltage range for direct connection
to industrial sensors and actuators
• Programmable power-up states provide safe operation when
connected to pumps/valves/motors/relays
• Watchdogs timer detects computer or application crashes and ensures
safe recovery to know digital I/O states
• Change detection triggers your application and returns I/O data after
a digital event to minimize processor usage
• Programmable input filters eliminate glitches/spikes and remove noise
NI [ NATIONAL INSTRUMENTS CORPORATION ]
