Product Introduction
The NI PXI-6236 is an isolated multifunction data acquisition (DAQ) module designed for industrial measurement, automated test, monitoring, and control applications that require electrical isolation between field signals and the measurement system.
The PXI-6236 combines 8 analog input channels, 4 analog output channels, and 6 digital I/O lines in a single PXI module. Its isolated architecture helps protect the measurement system from ground loops, common-mode voltage differences, electrical transients, and noisy industrial environments.
As part of the NI 623x industrial multifunction DAQ family, the PXI-6236 is particularly suitable for factory automation, industrial control, machine monitoring, process measurement, test-cell instrumentation, and other applications where conventional non-isolated DAQ hardware may not provide sufficient electrical protection.
Product Overview
The National Instruments PXI-6236 provides isolated analog and digital measurement resources within the modular PXI platform.
Unlike general-purpose multifunction DAQ modules intended primarily for laboratory-level signals, the PXI-6236 is optimized for industrial environments where sensors, actuators, controllers, and other field devices may operate at different ground potentials.
The combination of analog input, analog output, digital I/O, hardware timing, triggering, and isolation allows engineers to build compact measurement and control systems without requiring separate DAQ modules for each function.
Key Features
8 Analog Input Channels
The PXI-6236 provides eight analog input channels for measuring voltage signals in industrial and automated test applications.
- 8 analog input channels
- 16-bit analog input resolution
- Isolated measurement architecture
- Hardware-timed acquisition
- Industrial signal measurement
- Multi-channel monitoring
Advantage: Multiple analog inputs allow a single PXI-6236 module to monitor several field signals while maintaining electrical isolation from the PXI system.
16-Bit Analog Input Resolution
The PXI-6236 provides 16-bit analog-to-digital conversion for accurate industrial voltage measurements.
- 16-bit ADC resolution
- High-resolution signal acquisition
- Industrial monitoring
- Automated measurement
- Control-system feedback acquisition
Advantage: 16-bit resolution provides sufficient measurement detail for a wide range of industrial automation, monitoring, and test applications.
Isolated Analog Inputs
Electrical isolation is one of the primary advantages of the PXI-6236 compared with conventional multifunction DAQ modules.
- Isolation from the PXI system
- Reduced ground-loop problems
- Improved common-mode voltage tolerance
- Protection against electrical transients
- Improved measurement reliability in noisy environments
Advantage: Isolation allows the PXI-6236 to interface more safely with industrial equipment operating at different ground potentials.
4 Analog Output Channels
The PXI-6236 provides four analog output channels for generating programmable voltage signals.
- 4 analog outputs
- 16-bit output resolution
- Programmable voltage generation
- Industrial control signals
- DUT stimulus generation
- Closed-loop control applications
Advantage: Integrated analog outputs allow the module to generate control or stimulus signals while simultaneously acquiring analog feedback.
Isolated Analog Output Architecture
The analog output subsystem is designed for industrial measurement and control applications where electrical separation between the PXI system and external equipment is important.
This capability is useful when controlling industrial devices, test fixtures, actuators, or other equipment that may not share the same electrical ground as the PXI chassis.
6 Digital I/O Lines
The PXI-6236 includes six digital I/O lines for industrial control and status monitoring.
- 6 digital I/O lines
- Digital input functionality
- Digital output functionality
- Industrial device monitoring
- Test fixture control
- Automated sequencing
Advantage: Digital I/O can be used to monitor switches and status signals or control relays and other external devices.
Industrial Isolation
The PXI-6236 is designed specifically for applications where electrical isolation is required between measurement hardware and field equipment.
Isolation can help address several common industrial measurement problems:
- Ground potential differences
- Ground loops
- Common-mode interference
- Electrical noise
- Transient voltages
- Equipment protection requirements
Advantage: This makes the PXI-6236 more appropriate than many standard multifunction DAQ modules for electrically demanding industrial environments.
Hardware-Timed Data Acquisition
The PXI-6236 supports hardware-timed acquisition for deterministic measurement applications.
- Hardware-controlled sampling
- Continuous acquisition
- Buffered measurements
- Automated test sequences
- Repeatable timing
Hardware Triggering
Hardware triggering allows measurements to be synchronized with external events and other instruments in a PXI system.
- Digital triggering
- Start triggering
- Hardware event synchronization
- PXI trigger resources
- Automated test synchronization
PXI System Integration
The PXI-6236 integrates into modular PXI test and measurement systems.
- PXI peripheral module
- PXI chassis integration
- PXI timing and triggering
- Multi-instrument automated testing
- Modular system expansion
Advantage: The module can be combined with PXI switches, digitizers, oscilloscopes, controllers, communication interfaces, and other instruments to create complete automated test systems.
NI-DAQmx Software Support
The PXI-6236 is supported by NI-DAQmx for hardware configuration, acquisition, generation, digital I/O, timing, and triggering.
- NI-DAQmx driver
- LabVIEW integration
- NI MAX configuration
- TestStand integration
- C/C++ APIs
- .NET application development
Technical Specifications
| Parameter | Description |
|---|---|
| Product Type | Isolated PXI Multifunction I/O Module |
| Model | NI PXI-6236 |
| Product Family | NI 623x Industrial Multifunction DAQ |
| Bus Interface | PXI |
| Analog Inputs | 8 Channels |
| Analog Input Resolution | 16 Bit |
| Analog Input Isolation | Yes |
| Analog Outputs | 4 Channels |
| Analog Output Resolution | 16 Bit |
| Analog Output Isolation | Yes |
| Digital I/O | 6 Lines |
| Isolation | Designed for Isolated Industrial Measurement and Control |
| Hardware-Timed Acquisition | Supported |
| Hardware Triggering | Supported |
| Driver | NI-DAQmx |
| Primary Applications | Industrial Measurement, Automation, Monitoring, Control and Automated Test |
Why Isolation Matters in Industrial DAQ
Electrical isolation is one of the most important reasons to select the PXI-6236 instead of a conventional multifunction DAQ module.
In industrial systems, sensors and machines may be powered from different electrical sources. Their ground potentials can therefore differ from the ground reference of the PXI measurement system.
Connecting these signals directly to a non-isolated DAQ device can create ground loops, introduce measurement errors, increase electrical noise, and potentially expose measurement hardware to unwanted voltages.
The isolated architecture of the PXI-6236 helps electrically separate the measurement system from external field equipment, improving measurement reliability and system protection.
Analog Input Applications
The eight analog inputs can be used to monitor multiple industrial voltage signals.
- Machine condition signals
- Industrial sensor outputs
- Control-system feedback
- Power-system monitoring signals
- Test fixture measurements
- Process monitoring
Analog Output Applications
Four analog outputs allow the PXI-6236 to provide programmable signals to external equipment.
- Actuator control
- Programmable reference signals
- Device stimulus
- Closed-loop control
- Industrial test equipment control
Digital I/O Applications
The six digital I/O lines provide additional control and monitoring functionality.
- Switch-state monitoring
- Relay control
- Machine status acquisition
- Alarm monitoring
- Test fixture control
- Automated sequencing
Software Ecosystem
The NI PXI-6236 uses the NI-DAQmx software ecosystem for configuration, measurement, control, and automation.
- NI-DAQmx: Provides the hardware driver and APIs required for analog input, analog output, digital I/O, timing, and triggering.
- LabVIEW: Enables development of customized industrial monitoring, measurement, control, and automated test applications.
- NI MAX: Provides hardware discovery, configuration, device testing, and system diagnostics.
- TestStand: Allows PXI-6236 measurement and control functions to be incorporated into automated validation and production test sequences.
- C/C++ and .NET: Support development of custom DAQ and industrial automation applications using NI-DAQmx APIs.
Industries
- Industrial Automation
- Manufacturing
- Automotive Testing
- Energy Systems
- Electronic Manufacturing
- Machine Monitoring
- Process Measurement
- Research Laboratories
- Automated Test Equipment
Applications
Industrial Automation
The PXI-6236 is well suited for industrial automation systems requiring isolated analog measurement and control.
- Machine monitoring
- Process control
- Equipment status monitoring
- Control signal generation
- Industrial data acquisition
Automated Functional Testing
The combination of analog input, analog output, and digital I/O makes the PXI-6236 suitable for automated functional test systems.
- Electronic device testing
- Industrial equipment testing
- Functional verification
- Automated pass/fail testing
- Test fixture integration
Machine Monitoring
The isolated analog inputs can acquire signals from machines and industrial equipment while helping reduce problems caused by differences in electrical ground potential.
- Machine status monitoring
- Sensor acquisition
- Equipment diagnostics
- Automated data logging
Process Measurement and Control
The PXI-6236 can acquire process signals and generate analog or digital control outputs within automated systems.
- Process variable monitoring
- Control feedback acquisition
- Analog control output
- Digital equipment control
Test Cell Instrumentation
PXI modular architecture makes the PXI-6236 suitable for test cells combining measurement, switching, communication, and control instruments.
PXI-6236 vs Non-Isolated Multifunction DAQ
| Feature | PXI-6236 | Typical Non-Isolated DAQ |
|---|---|---|
| Primary Design | Industrial Isolated Measurement | General-Purpose Measurement |
| Electrical Isolation | Yes | Typically No |
| Ground Loop Protection | Improved | Requires Careful Grounding |
| Industrial Noise Environment | Designed for Industrial Applications | Application Dependent |
| Analog Input | 8 Channels | Varies |
| Analog Output | 4 Channels | Varies |
| Best Application | Industrial Measurement and Control | Laboratory and General DAQ |
Comparison with Similar NI Multifunction I/O Modules
| Model | Main Difference | Best Application |
|---|---|---|
| NI PXI-6236 | Isolated multifunction PXI DAQ combining 8 AI, 4 AO and 6 DIO. | Industrial isolated measurement and control |
| NI PCI-6236 | PCI version providing similar isolated multifunction I/O capabilities for desktop computer-based systems. | Industrial PCI-based measurement systems |
| NI PXI-6232 | Related isolated PXI multifunction DAQ for industrial measurement applications. | Industrial isolated data acquisition |
| NI PXI-6259 | General-purpose M Series multifunction DAQ with substantially more analog and digital channels but without the same industrial isolation architecture. | General-purpose high-channel-count PXI DAQ |
Recommended Related Products
| NI PCI-6236 | Related PCI industrial multifunction I/O device for applications requiring similar isolated measurement functionality outside a PXI chassis. |
| NI PXI-6232 | Related PXI isolated multifunction DAQ module for industrial data acquisition and control systems. |
| NI PXI-6259 | General-purpose multifunction PXI DAQ for applications prioritizing channel count and multifunction measurement over isolation. |
Why Choose NI PXI-6236?
- Designed for isolated industrial measurements
- 8 analog input channels
- 16-bit analog input resolution
- 4 analog output channels
- 16-bit analog output resolution
- 6 digital I/O lines
- Electrical isolation
- Reduced ground-loop problems
- Improved operation in electrically noisy environments
- Hardware-timed data acquisition
- Hardware triggering
- NI-DAQmx software support
- PXI modular system integration
- Suitable for measurement and control
- Ideal for maintaining existing industrial PXI systems
Frequently Asked Questions
What is the NI PXI-6236?
The NI PXI-6236 is an isolated PXI multifunction data acquisition module designed for industrial measurement, monitoring, control, and automated test applications.
How many analog inputs does the PXI-6236 have?
The PXI-6236 provides eight analog input channels with 16-bit analog-to-digital conversion.
How many analog outputs does the PXI-6236 have?
The PXI-6236 provides four analog output channels with 16-bit resolution for programmable signal generation and control applications.
How many digital I/O lines does the PXI-6236 have?
The PXI-6236 provides six digital I/O lines for external device monitoring and control.
Is the PXI-6236 isolated?
Yes. Electrical isolation is one of the primary characteristics of the PXI-6236 and the NI 623x industrial multifunction DAQ family.
Why is isolation important in a DAQ system?
Isolation helps reduce problems caused by ground loops and differences in ground potential between the measurement system and external equipment. It can also improve system robustness when measurements are performed in electrically noisy industrial environments.
Can the PXI-6236 be used for industrial automation?
Yes. The combination of isolated analog inputs, analog outputs, digital I/O, and PXI system integration makes the PXI-6236 particularly suitable for industrial automation, machine monitoring, process measurement, and automated control applications.
Can the PXI-6236 generate analog signals?
Yes. The PXI-6236 provides four analog output channels that can be used for programmable voltage generation, device stimulus, control signals, and closed-loop applications.
What software supports the PXI-6236?
The PXI-6236 uses NI-DAQmx and can be integrated into compatible LabVIEW, NI MAX, TestStand, C/C++, and .NET measurement applications.
What is the difference between PXI-6236 and PCI-6236?
The two models belong to the same industrial multifunction DAQ family and provide similar isolated measurement and control capabilities. The primary difference is the host platform: PXI-6236 is designed for modular PXI systems, while PCI-6236 is designed for installation in compatible desktop computer PCI slots.
What is the difference between PXI-6236 and PXI-6259?
The PXI-6236 is optimized for isolated industrial measurement and control, while the PXI-6259 is a general-purpose M Series multifunction DAQ module with a significantly higher channel count. The PXI-6236 is preferable when isolation and industrial signal interfacing are priorities, while the PXI-6259 is better suited to general-purpose high-channel-count DAQ applications.
What applications are suitable for the PXI-6236?
Typical applications include industrial automation, machine monitoring, process measurement and control, automated functional testing, manufacturing test, test-cell instrumentation, and systems where electrical isolation between field equipment and the PXI platform is required.
Is the PXI-6236 suitable for replacing an existing module?
Yes. The PXI-6236 can be particularly valuable for maintaining or repairing existing industrial PXI systems originally designed around NI 623x isolated multifunction DAQ hardware. Before replacement, verify the exact part number, connector and cabling requirements, chassis compatibility, signal ranges, isolation requirements, and NI-DAQmx software compatibility.
Conclusion
The NI PXI-6236 Isolated Multifunction I/O Module combines eight analog inputs, four analog outputs, six digital I/O lines, 16-bit conversion, hardware timing, triggering, and industrial isolation within a modular PXI platform. Its isolated architecture makes it particularly suitable for factory automation, machine monitoring, process measurement, test-cell instrumentation, and automated control systems where ground potential differences, electrical noise, and system protection are important considerations.
