PXIE-8521 - NI Ethernet Interface Module

Description

The PXIe-8521 (Part Numbers: 786771-01,147673B-02L ) is a PXI Automotive Ethernet Interface Module. The PXIe-8521 module is a module created by National Instruments. The NI PXIe-8521 module is launched with part numbers 786771-01 and 147673B-02L. The PXIe-8521 module belongs to the family of products made for PXI Express bus slots by NI. National Instruments created the NI-XNET driver software for developing applications with this module. The NI PXIe-8521 module is assembled with 4 ports. The NI PXIe-8521 is a 100BASE-T1 unshielded twisted pair (UTP) PXI Automotive Ethernet Interface Module. The NI PXIe-8521 is perfect for developing applications that involve Automotive Ethernet to validate and assess automotive electronic control units (ECUs). This Automotive Ethernet Interface Module supports a maximum of four independent endpoints. The NI PXIe-8521 module can additionally support a maximum of 2 network terminal access points. The National Instruments PXIe-8521 PXI Automotive Ethernet Interface Module is produced with many useful features, such as onboard hardware timestamping. The front panel of the PXIe-8521 module is equipped with several LED indicators, which allow the user to monitor the network link and activity. This module also can act as a maximum of four individual 802.1AS masters or slaves. This feature enables the module to synchronize with an external network and the remainder of a PXI system. The NI PXIe-8521 is manufactured as a Gen 2 x4 PXI Express, rev 1.0 compliant module. The PXIe-8521 contains Weidmuller BLF 3.50, 3-position I/O connectors. The NI PXIe-8521 module is built with a network tap latency of 1.73 μs.

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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