VMIVME-3122 数字化输入板 双端口数据存储器

【产品详情】

VMIVME-3122是VMIC广泛的模拟输入/输出系列的成员

VMEbus的产品。16位数字分辨率，程控增益，可选择转换率，并自动扫描64差动或单端模拟输入，VMIVME-3122提供卓越的动态范围和模拟输入通道密度。支持多种操作模式，包括自动扫描，数据突发和外部同步。这块板被设计成接口直接与VMIC的信号调理板线数字化热电偶，rtd和应变片的输出。

可以下载单个通道增益以在扫描操作期间使用，或者该板可以配置为所有通道通用的固定增益。多个单板可以同步在一起，最多可以同步16个单板同时启动每个扫描。一个间隔定时器，总线中断器，通道计数器和Midscan/Endscan标志简化了对双通道内数据的监控端口数据缓冲区。可以从VMIVME-3122中受益的系统应用程序功能包括工厂自动化，过程控制，数据采集系统，训练模拟器和实验室仪器。

VMIVME-3122提供的性能:

•16,32或64差分或单端模拟输入

•16位A/D转换

•381赫兹至100 kHz可选择的扫描率为高性能选项，381赫兹

到50千赫的标准性能选项

•可编程增益x1或x10

VMIVME-3122的特点(续):

•A/D转换器范围为±2.5 V，±5v，±10v,0至+5v,0至+10v

•可编程通道增益

•16至1,024字双端口数据缓冲区

•短I/O(A16)，标准(A24)或扩展(A32)数据空间的操作

•可编程通道块大小和缓冲区大小

•可选的低通输入滤波器

•连续和突发工作模式

•自由运行或外部/内部触发

•Midscan或Endscan指示总线中断器

•可编程间隔定时器定时数据爆发

•从VMIC信号调理板直接布线

•初始化后复位在自动扫描模式增益=x1

功能描述

VMIVME-3122(第15页上的图1)是高分辨率的16位64通道用于VMEbus系统的模拟扫描和数字化输入板。双端口数据存储器，板载计时器，自动控制增益和可编程总线中断使VMIVME-3122支持广泛的模拟输入流量，与最小的主机处理器的参与。模拟输入被扫描并顺序数字化。数字值存储在一个双端口数据缓冲区，可以在任何时候从VMEbus访问。的增益每个通道可以单独编程，也可以在软件中设定为固定所有信道共有的增益。通道增益是软件可选的x1或x10。A/D转换器电压范围为±2.5 V，±5v，±10v,0至5v，可跳线选择0~10v。

当系统或程序复位发生时，板在64通道中初始化自动扫描模式在100千赫的速率和所有通道增益初始化为统一(x1)。复位操作后，程序可以选择定时突发或触发突发模式，并且可以根据需要修改块大小、缓冲区大小和通道增益。通道块可调为1、8、16、32或64通道，以及数据缓冲区大小可以以二进制增量从16到1,024个数据字进行选择。在标准性能模式下，单板复位后必须重新编程50千赫的扫描速率必须将值$00F7写入相对地址0006美元。定时数据爆发由一个间隔计时器控制，它可以提供重复的或单次爆发间隔可达687秒。一次爆发可由6个

8到1024通道样本。的中间或末尾可用一个数据就绪标志扫描，中断请求可以与标志同时生成。的中断也可以在获得特定数量的样本后启动

VMIVME-3122 数字化输入板 双端口数据存储器

【英文介绍】

The VMIVME-3122 is a member of VMIC's extensive analog input/output family

VMEbus products. With 16-bit digital resolution, programmable gain, selectable conversion rates, and automatic scanning of 64 differential or single-ended analog inputs, the VMIVME-3122 offers superior dynamic range and analog input channel density. Supports multiple modes of operation, including automatic scanning, data burst, and external synchronization. This board is designed to interface directly with VMIC's signal conditioning board wire for digitized thermocouple, rtd and strain gauge output.

A single channel gain can be downloaded for use during a scan operation, or the board can be configured as a fixed gain common to all channels. Multiple boards can be synchronized together. A maximum of 16 boards can be synchronized to start each scan at the same time. An interval timer, bus interrupter, channel counter, and Midscan/Endscan flag simplify the monitoring of port data buffers for data within dual channels. System application features that can benefit from VMIVME-3122 include factory automation, process control, data acquisition systems, training simulators and laboratory instruments. The following is a brief overview of the main features, illustrating flexibility and

VMIVME-3122 provides:

•16,32 or 64 differential or single-ended analog inputs

• 16-bit A/D conversion

•381 Hz to 100 kHz Selectable scan rate for high performance option, 381 Hz

Standard performance options up to 50 KHZ

• Programmable gain x1 or x10

Features of VMIVME-3122 (continued):

•A/D converters range from ± 2.5V, ±5v, ±10v,0 to +5v,0 to +10v

• Programmable channel gain

•16 to 1,024 word dual-port data buffer

Short I/O(A16), standard (A24), or extended (A32) data space operations

• Programmable channel block size and buffer size

• Optional low-pass input filter

• Continuous and burst operating modes

• Free running or external/internal triggering

•Midscan or Endscan indicates the bus interrupter

• Programmable interval timer to time data bursts

• Direct wiring from VMIC signal conditioning board

• Reset after initialization in automatic scan mode gain =x1

Function description

The VMIVME-3122(Figure 1 on page 15) is a high-resolution 16-bit 64-channel analog scanning and digitizing pad for VMEbus systems. Dual-port data memory, onboard timer, automatic control gain and programmable bus interrupts enable the VMIVME-3122 to support a wide range of analog input traffic, with minimal host processor involvement. Analog inputs are scanned and sequentially digitized. The numeric values are stored in a two-port data buffer that can be accessed from the VMEbus at any time. Each channel can be programmed individually or set in software to fix a gain common to all channels. The channel gain is software-optional x1 or x10. The A/D converter voltage range is ± 2.5V, ±5v, ±10v,0 to 5v, and the jumper can be selected from 0 to 10v.

When a system or program reset occurs, the board initializes the automatic scan mode in 64 channels at a rate of 100 KHZ and all channel gains are initialized to uniform (x1). After the reset operation, the program can choose a timed burst or trigger burst mode, and can modify the block size, buffer size, and channel gain as needed. Channel blocks can be adjusted to 1, 8, 16, 32, or 64 channels, and data buffer sizes can be selected in binary increments from 16 to 1,024 data words. In standard performance mode, the board must be reprogrammed after resetting the scan rate of 50 KHZ must write the value $00F7 to the relative address of $0006. Timed data bursts are controlled by an interval timer, which can provide repeated or single burst intervals of up to 687 seconds. An outbreak can consist of up to six

8 to 1024 channel samples. A data ready flag can be scanned in the middle or end of the data ready flag, and interrupt requests can be generated at the same time as the flag. Interrupts can also be initiated after obtaining a specific number of samples

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