PXI-6528 - NI Digital I/O Module

Description

The NI PXI-6528 (Part number: 778543-01) is a PXI Digital I/O Module featured with 48 channels in all: 24 optically isolated digital Inputs, and 24 solid-state relay outputs, with Channel-Channel Isolation. This model is a cost-efficient, industrial, parallel digital I/O module with included programmable power-up states. This module comes with a sturdy configuration and can provide as many as 24 isolated input and output channels. It also features change detection, real-time system integration (RTSI), and digital filtering. This model is ideal for high voltage switching and isolation in both laboratory and industrial environments. This PXI Digital I/O Module requires no jumper setting for I/O configuration, since it is entirely software configurable. The NI PXI-6528 is completely compliant with the PCI Local Bus and the PXI hardware standards and specifications. It is a smart system capable of automatically allocating all device resources, including the input level and base address. Like other measurement devices from National Instruments, the PXI-6528 comes with NI-DAQ driver software. This software has a wide-ranging collection of VIs and functions, which the user can initiate from their software such as LabWindows™ or LabVIEW to program all the programmable features of the PXI-6528. The device is equipped with a 100-pin keyed female SCSI connector. It has an input voltage range of -60 VDC to 60 VDC, and a maximum input current of 3.0 mA. The NI PXI-6528 employs the RTSI bus interface to trigger signals between the NI PXI-6528 and other RTSI-compatible instruments or devices. The change detection feature of the NI PXI-6528 can easily be programmed to initiate an interruption in case a change occurs on any input line. This Digital I/O Module can also monitor changes on either user-defined or all input lines. It generates an interruption whenever an input deviation occurs. The NI device weighs 4.6 oz, and measures 6.3 x 3.9 in. in physical dimensions. It has a recommended operating temperature range of 0 to 55 °C, and a storage temperature range of –20 to 70 °C. The module has a typical power requirement of 400 mA at +3.3 VDC, and 250 mA at +5 VDC.

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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