Digital I/O Hardware Product-Feature Matrix

Publish Date: Dec 01, 2017 | 25 Ratings | 3.92 out of 5 | Print

Overview

This document is part of a comprehensive tutorial on industrial Digital I/O and Counter/Timer hardware. Learn about National Instruments product offerings for digital and timing I/O, the Industrial Feature Set including watchdog timers and isolation, complementary devices like relays, solenoids and encoders, concepts like sinking and sourcing, and see how these devices can be used in your industrial application.

For more information return to the Complete Industrial Digital I/O and Counter/Timer Tutorial.

Table of Contents

  1. Digital I/O Industrial Features
  2. 5V / TTL Digital I/O Hardware
  3. 30V Isolated Digital I/O Hardware
  4. 60V Isolated Digital I/O Hardware

1. Digital I/O Industrial Features

The NI 6509, NI 651x, NI 6528 and NI 6529 low-cost digital I/O boards deliver a high-reliability industrial feature set that includes programmable power-up states, programmable input filters, watchdog timers, change detection and industrial certifications. These boards are available for the PCI and PXI/CompactPCI platforms. 

The NI 651x family offers guaranteed 24V logic levels and optical isolation in banks of 8 channels with a ±30 VDC range. The NI 6528 and NI 6529 offers channel-channel optical isolation to eliminate ground loops and a ±60 VDC range. You can use programmable power-up states on each digital I/O device to configure the initial digital state in software, which ensures safe operation when controlling industrial actuators such as pumps, valves, motors and relays. Programmable input filters eliminate noise on inputs, remove glitches and spikes, and provide debouncing for digital switches and relays. Digital I/O watchdogs protect against a variety of fault conditions such as computer and application crashes1. These features are especially valuable for mission-critical industrial automation and control applications.

 

1 Note that the NI-DAQmx Watchdog feature is meant to protect a system from software errors and hangs. In the case of a PXI system with remote control via MXI, a lost MXI connection could result in unexpected Watchdog behavior and therefore improperly implemented Watchdog states. 

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2. 5V / TTL Digital I/O Hardware

 

Features NI 6501 NI 6503 NI 6509
Bus
USB
PCI
USB, PCI, PXI
Digital I/O Voltage Range (VDC)
0..5
0..5
0..5
Logic Levels
TTL
TTL
TTL
Sinking/Sourcing Output
Both
Both
Both
Max Current Drive
8.5 mA
2.5 mA
24 mA
Watchdog Timer
No
No
Yes
Programmable Power Up States
No
Yes
Yes
Isolation
No
No
No
Programmable Input Filters
No
No
Yes
Change Detection
No
No
Yes
Industrial Certification
Yes
Yes
Yes
Number of Channels
24 DIO
24 DIO 96 DIO


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3. 30V Isolated Digital I/O Hardware

 

  64 Channels, 100-pin SCSI Connector
Features NI 6511 NI 6512 NI 6513 NI 6514 NI 6515
Bus
PCI, PXI
PCI, PXI
PCI, PXI
PCI, PXI
PCI, PXI
Voltage Range (VDC)
-30..30
-30..30
-30..30
-30..30
-30..30
Logic Levels
24V
-
-
24V
24V
Sinking/Sourcing Output
-
Sourcing
Sinking
Sourcing
Sinking
Max Current Drive
-
350 mA
475 mA
350 mA
475 mA
Watchdog Timer
n/a
Yes
Yes
Yes
Yes
Programmable Power Up States
n/a
Yes
Yes
Yes
Yes
Isolation
Bank
Bank
Bank
Bank
Bank
Programmable Input Filters
Yes
n/a
n/a
Yes
Yes
Change Detection
Yes
n/a
n/a
Yes
Yes
Industrial Certification
Yes
Yes
Yes
Yes
Yes
NI-DAQmx Support
Yes
Yes
Yes
Yes
Yes
Number of Channels
64 DI
64 DO
64 DO
32 DI
32 DO
32 DI
32 DO


  32 Channels, 37-pin DSUB Connector
Features NI 6510 NI 6516 NI 6517 NI 6518 NI 6519
Bus
PCI
PCI
PCI
PCI
PCI
Voltage Range (VDC)
-30..30
-30..30
-30..30
-30..30
-30..30
Logic Levels
24V
-
-
24V
24V
Sinking/Sourcing Output
-
Sourcing
Sinking
Sourcing
Sinking
Max Current Drive
-
350 mA
475 mA
350 mA
475 mA
Watchdog Timer
n/a
Yes
Yes
Yes
Yes
Programmable Power Up States
n/a
Yes
Yes
Yes
Yes
Isolation
Bank
Bank
Bank
Bank
Bank
Programmable Input Filters
Yes
n/a
n/a
Yes
Yes
Change Detection
Yes
n/a
n/a
Yes
Yes
Industrial Certification
Yes
Yes
Yes
Yes
Yes
Number of Channels
32 DI
32 DO
32 DO
16 DI
16 DO
16 DI
16 DO


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4. 60V Isolated Digital I/O Hardware

 

  NI 6525 NI 6528 NI 6529
Bus
USB
PCI, PXI
PXI
Voltage Range (VDC)
-60..60
-60..60
-60..60
Logic Levels
TTL, 24V
24V
24V
Sinking/Sourcing Output
Both
Both
-
Max Current Drive/Channel
500 mA
150 mA
-
Watchdog Timer
No
Yes
Yes
Programmable Power Up States
No
Yes
-
Isolation
Ch-Ch
Ch-Ch
Ch-Ch
Programmable Input Filters
No
Yes
Yes
Change Detection
No
Yes
Yes
Industrial Certification
Yes
Yes
Yes
Number of Channels
8 DI
8 DO
24 DI
24 DO
48 DI

 

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