描述
产品定位与功能
NI PXI-6602是美国国家仪器（NI）推出的PXI平台定时和数字I/O模块，专为工业自动化、测试测量及复杂数字信号处理场景设计。其核心功能包括高精度计数器/定时器控制、多通道数字信号采集与生成，支持编码器定位、频率测量、脉冲序列生成等任务。
核心参数与性能
计数器/定时器模块
-通道数量：8个独立32位计数器/定时器；
-最大源频率：80 MHz（通过预定标可达125 MHz）；
-功能模式：周期测量、脉宽测量、频率测量、脉冲生成、编码器接口等。
数字I/O接口
-总线数量：32条TTL/CMOS兼容数字I/O线；
-专用线路：8条专用数字I/O线（独立于计数器功能）；
-滤波功能：内置数字去抖动滤波器，抑制信号噪声。
数据传输与同步
-DMA通道：3通道高速DMA传输，降低CPU负载；
-同步支持：通过RTSI总线实现多模块同步控制。
物理与环境规格
-接口类型：68针SCSI-II型公头连接器；
-工作温度：-32℃至90℃；
-兼容性：支持Windows、Linux、Mac OS及实时系统。
技术特点
灵活性与扩展性
-编程支持：兼容LabVIEW、LabWindows/CVI、Python等开发环境，通过NI-DAQmx驱动实现任务配置；
-资源分配：计数器通道与部分数字I/O线可灵活复用，适应复杂信号流需求。
高精度测量优化
-时间基准稳定性：50 ppm时基误差，确保长期测量可靠性；
-动态配置：支持运行中调整计数器模式（如从频率测量切换至脉冲生成）。
工业场景适配
-抗干扰设计：TTL输入采用汲极/源极电流驱动，增强信号完整性；
-多协议兼容：可集成至DCS、PLC系统，支持AnyBus等工业通信协议。
典型应用场景
工业自动化控制
-伺服电机编码器反馈采集（多轴同步定位）；
-生产线计数与事件监测（如产品包装计数）。
测试测量系统
-电力电子设备频率特性分析（结合PXI-6259多功能DAQ板卡）；
-通信协议验证（数字I/O模拟UART/LVDS信号）。
Product Positioning and Functions
NI PXI-6602 is a PXI platform timing and digital I/O module launched by National Instruments(NI),designed for industrial automation,testing and measurement and complex digital signal processing scenarios.Its core functions include high-precision counter/timer control,multi-channel digital signal acquisition and generation,and support encoder positioning,frequency measurement,pulse sequence generation and other tasks.
Core parameters and performance
Counter/Timer Module
-Number of channels:8 independent 32-bit counters/timers;
-Maximum source frequency:80 MHz(up to 125 MHz by pre-determined calibration);
-Functional modes:periodic measurement,pulse width measurement,frequency measurement,pulse generation,encoder interface,etc.
Digital I/O interface
-Number of buses:32 TTL/CMOS compatible digital I/O lines;
-Dedicated circuits:8 dedicated digital I/O lines(independent of counter function);
-Filtering function:Built-in digital dejitter filter to suppress signal noise.
Data transmission and synchronization
-DMA channel:3-channel high-speed DMA transmission to reduce CPU load;
-Synchronization support:Multi-module synchronization control is realized through the RTSI bus.
Physical and Environmental Specifications
-Interface type:68-pin SCSI-II male connector;
-Operating temperature:-32℃to 90℃;
-Compatibility:Supports Windows,Linux,Mac OS and real-time systems.
Technical Features
Flexibility and scalability
-Programming support:compatible with LabVIEW,LabWindows/CVI,Python and other development environments,and implement task configuration through NI-DAQmx driver;
-Resource allocation:The counter channel and some digital I/O lines can be flexibly reused to meet the needs of complex signal flows.
High-precision measurement optimization
-Time reference stability:50 ppm time base error,ensuring long-term measurement reliability;
-Dynamic configuration:Supports adjustment of counter mode during operation(such as switching from frequency measurement to pulse generation).
Industrial scenario adaptation
-Anti-interference design:The TTL input is driven by drain/source current to enhance signal integrity;
-Multi-protocol compatibility:can be integrated into DCS and PLC systems,and supports industrial communication protocols such as AnyBus.
Typical application scenarios
Industrial automation control
-Feedback acquisition of servo motor encoder(multi-axis synchronous positioning);
-Production line counting and event monitoring(such as product packaging counting).
Test and measurement system
-Analysis of frequency characteristics of power electronic equipment(combined with PXI-6259 multi-function DAQ board);
-Communication protocol verification(digital I/O analog UART/LVDS signal).
