NI Pxi-6514 industrial digital I/O module

NI PXI-6514 Overview

The NI PXI-6514 (Part Number: 778965-01) is a 64-channel, ±30 VDC, bank-isolated PXI Digital I/O module designed for industrial data acquisition, automated manufacturing test, and control applications. It features 32 source/sink digital input lines and 32 source digital output lines, providing robust and reliable interfacing with industrial sensors and actuators.

Product Detailed Description

• Functionality: The PXI-6514 serves as an interface between a PXI or CompactPCI system and industrial-level digital signals. It allows users to:

• Acquire Digital Inputs: Read the state (ON/OFF, High/Low) of up to 32 industrial digital signals, which can be configured as either source or sink inputs to match various sensor types.

• Control Digital Outputs: Drive up to 32 industrial digital outputs, specifically configured as source outputs, to control devices like relays, solenoids, motors, and valves.

• Isolation: Features bank isolation, meaning that groups of channels are electrically isolated from each other and from the PXI backplane. This provides enhanced noise immunity, protection against ground loops, and the ability to handle different voltage potentials in a system.

• Key Features:

• High Channel Count: 64 total channels (32 input, 32 output) for comprehensive digital control and monitoring.

• Wide Voltage Range: Compatible with industrial signal levels up to ±30 VDC, commonly used in 24 V industrial systems.

• Source/Sink Inputs: The 32 input channels can be independently configured for source or sink operation, offering flexibility for different sensor wiring schemes.

• Source Outputs: The 32 output channels are designed as source outputs, providing power to the connected load.

• High Current Drive: Each single-ended digital I/O channel typically supports a current drive of up to 250 mA, allowing direct connection to many industrial devices without external relays.

• Programmable Power-Up States: Users can configure the initial output states in software, ensuring safe operation of connected actuators upon system startup or reset.

• Digital I/O Watchdogs: Provides a safety mechanism to switch to a configurable safe output state if a computer or application fault occurs, ensuring safe recovery from abnormal conditions.

• Programmable Input Filters: Software-selectable digital filters can be used to eliminate glitches/spikes on input data and provide debouncing for mechanical switches and relays, improving signal integrity and reliability.

• NI-DAQmx Driver Software: Compatible with NI-DAQmx, a powerful and intuitive driver software that simplifies application development with features like the DAQ Assistant and automatic code generation.

• PXI Hybrid Compatibility: Designed for PXI Hybrid slots, allowing it to be used in both PXI and PXI Express chassis.

• Robust Design: Built for industrial environments, ensuring reliability and long-term performance.

Product Parameters

(Note: Always refer to the official NI PXI-6514 datasheet or manual for the most precise and up-to-date specifications.)

• Form Factor: PXI module

• Channels:

• Digital Inputs: 32 (Source/Sink configurable)

• Digital Outputs: 32 (Source)

• Total Channels: 64

• Digital I/O Logic Levels: 24 V (nominal)

• Digital Input Voltage Range: ±11 VDC to ±30 VDC (logic high threshold), 0 VDC to ±4 VDC (logic low threshold)

• Digital Output Voltage Range: -30 V to +30 VDC (user-provided Vcc, typically > 10 VDC)

• Single-Ended Digital I/O Channel Current Drive (Output): 250 mA (per channel)

• Input Current (typical): 4.5 mA (at 11 V), 12.5 mA (at 30 V)

• Isolation: Bank-isolated (optical isolation between banks and from bus)

• Common-mode Isolation Voltage: 30 VDC

• Propagation Delay: 75 µs (typical for inputs)

• Bus Interface: PXI Hybrid

• Connector Type: 100-pin keyed female SCSI type (requires external connector blocks like CB-50 or shielded cables like SH100-100-F)

• Power Consumption (Typical):

• +5 VDC: 250 mA

• +3.3 VDC: 300 mA

• Operating Temperature Range: 0 °C to +55 °C

• Storage Temperature Range: -20 °C to +70 °C

• Relative Humidity: 10% to 90%, non-condensing (operating); 5% to 95%, non-condensing (storage)

• Dimensions (PXI Module): Approx. 16 cm × 10 cm (6.3 in. × 3.9 in.)

• Weight: Approx. 172.9 g (6.1 oz)

• Driver Software: NI-DAQmx

• OS Compatibility: Windows (e.g., Windows 2000/NT/XP as per older datasheets, newer DAQmx versions support newer Windows OS)

Product Advantages

• Industrial Robustness: Designed to withstand the rigors of industrial environments, making it suitable for factory automation and manufacturing test.

• High Reliability Features: Includes isolation, programmable power-up states, digital I/O watchdogs, and programmable input filters, which are crucial for ensuring safe and reliable operation in industrial control systems.

• Direct Sensor/Actuator Connection: High current drive and wide voltage range allow direct connection to many industrial 24 V electronic devices, sensors, and actuators, simplifying wiring and reducing external component count.

• Versatile Input/Output: The 32 source/sink inputs and 32 source outputs offer flexibility to interface with a wide array of industrial digital devices.

• System Integration: As a PXI module, it benefits from the PXI platform's integrated timing and synchronization capabilities, high data throughput, and compact modular design, allowing for the creation of high-performance automated test and control systems.

• Software Productivity: NI-DAQmx software significantly speeds up application development with its intuitive API, DAQ Assistant, and automatic code generation.

• Cost-Effective Solution: Offers a feature-rich solution for industrial digital I/O at a competitive cost, especially when considering the integrated safety and reliability features.

Precautions

• Proper Installation: Install the module in a compatible PXI chassis according to the NI PXI chassis user manual. Ensure adequate cooling and ventilation for the chassis.

• Wiring and Connectivity: Use appropriate shielded cables (e.g., SH100-100-F) and connector blocks (e.g., CB-50, CB-37FH) recommended by NI to maintain signal integrity, isolation, and EMC performance.

• Grounding: Ensure proper system grounding to prevent noise and ensure safety.

• Power Supply: The output Vcc (user-provided voltage for the output channels) must be correctly applied and within the specified voltage range to ensure proper operation of the output lines.

• ESD Protection: Take necessary electrostatic discharge (ESD) precautions when handling the module to prevent damage to sensitive components.

• Overcurrent Protection: While outputs may have self-resetting fuses, ensure that the total current draw per port and per bank does not exceed specified limits to prevent damage to the module or connected devices.

• Software Compatibility: Ensure that the NI-DAQmx driver version is compatible with your operating system and application development environment (e.g., LabVIEW, C++).

• Environmental Conditions: Operate the module within its specified ambient temperature and humidity ranges. Avoid exposure to harsh chemicals or excessive vibration.

• Safety Critical Applications: For applications where system failure could cause harm to property or persons, rely on multiple levels of safety mechanisms and do not rely solely on a single electronic system. NI products are not specifically designed or tested for human life support applications unless explicitly stated otherwise.

Product Applications

The NI PXI-6514 is highly versatile and finds extensive use in various industrial and test applications:

• Automated Manufacturing Test:

• Testing of industrial electronics, sensors, and actuators.

• End-of-line functional testing of products.

• Production line verification and quality control.

• Industrial Control and Automation:

• Interfacing with industrial sensors (e.g., proximity sensors, limit switches, pushbuttons).

• Controlling industrial actuators (e.g., relays, solenoids, contactors, pilot lights, small motors, valves).

• Machine control and sequence management.

• Factory automation systems.

• Data Acquisition Systems:

• General-purpose digital data acquisition in industrial environments.

• Monitoring digital states in a process or machine.

• Process Monitoring:

• Reading status inputs from process equipment.

• Controlling on/off valves or pumps based on process conditions.

• Test Benches and Rigs:

• Used in custom test systems for various industries (automotive, aerospace, energy) where robust digital I/O is required to simulate or control real-world signals.

• Building Automation:

• Interfacing with digital signals for HVAC control, lighting systems, and security systems.