AT-DIO-32F - NI Digital I/O Interface

Description

The AT-DIO-32F is a high-speed Digital I/O Interface developed by National Instruments. The AT-DIO-32F is available with part numbers 180735-01 and 776246-01. The AT-DIO-32F is a member of National Instruments AT Series and works as a channel expansion board for interfacing with IBM PC and other computers. This 32-bit parallel Digital I/O Interface features 32 I/O channels organized into four 8-bit ports. The AT-DIO-32F is compatible with TTL. With a data transfer rate of 450 keywords per second and high performance of data acquisition for laboratory or production testing, it can control and monitor industrial processes. The AT-DIO-32F can handle interrupts with its onboard counters. DMA transfers on 2 DMA channels can generate patterns. The availability of a large number of handshaking options makes this Digital I/O Interface compatible with a wide-ranging variety of computers and other devices. The AT-DIO-32F interface can communicate with other AT Series boards via the RTSI bus interface. For data transfer, the AT-DIO-32F uses a 50-pin male connector compatible with a DEC DRV11J parallel interface and other 32-bit channel I/O applications. The AT-DIO-32F can interface with IBM PC/XT, PC AT, and Apple Macintosh II computers containing the National Instruments NB-DIO-24 or NB-DIO-32F, Q-BUS system with a 16-bit interface, DEC LSI-11 microcomputer with a 32-bit DRV11J interface, and other 8-bit, 16-bit, or 32-bit parallel interface computers containing different National Instruments DIO modules. This Digital I/O Interface is also compatible with panel meters, testing instruments with BCD readouts, and control and optoisolated solid-state relays. The AT-DIO-32F can be used with DOS using LabWindows and with Windows using LabVIEW.

One: PLC analog input module (analog input module), also known as A/D module, converts the continuous analog signal generated by the sensor detection in the field into the digital quantity that the PLC CPU can receive, generally 12-bit binary number, the more digital quantity modules, the higher the resolution. Two: PLC analog output module. The analog output module, also known as D/A module, converts the digital quantity sent by the PLC CPU to the analog output module into the analog quantity (voltage or current) that can be received by the external device. The digital signal received by the analog output module is generally 12-bit binary number, and the more digital quantity modules, the higher the resolution. The digital module is to detect the state of the external switching input. Three: Digital input and output signal is the switching signal, 0 or 1, analog signal, there are two, voltage or current signal, generally the signal transmitted by the transmitter, such as the pressure transformer to detect the pressure of the water pipe, it will output an analog signal 4-20ma or 0-10V signal to the PLC, PLC for data processing, This is the difference between a digital input module and an analog input module.

In the input sampling phase, the PLC successively reads all input status and data by scanning and stores them in the corresponding cell in the I/O image area. After the end of the input sampling, the user program execution and output refresh phase. In both phases, even if the input state and data change, the state and data of the corresponding unit in the I/O map area will not change. Therefore, if the input is a pulse signal, the width of the pulse signal must be greater than one scan cycle to ensure that the input can be read in any case. The acquisition of the switching quantity is realized through the PLC input module, which is generally a DC 24V input. The PLC provides a common point, positive or negative, and then the common point is connected to the limit switch and other devices. When the limit is closed, the path is formed and the signal is introduced into the PLC input point. Specifically why the input point to power inside the state is on, is the function of PLC itself, you do not need to tube. Through the analog module, A/D (analog/digital) module, the external weight signal, temperature signal, pressure signal can be introduced, A/D module can accept the signal is 0-10V, 0-5V, -5-5V voltage signal and 0-20MA, 4-20MA current signal. If the signal obtained by the terminal acquisition module is not these standard signals, but also through the transmitter conversion, after the standard signal enters the A/D module, it will be converted by A/D into a number, the specific range is different PLC is not the same, these converted digital quantities, can be used by the program, conversion, processing, and finally get the required data displayed.

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