NI PXIe-6363数据采集输入卡
品牌：NI
型号：NI PXIe-6363数据采集输入卡
产品说明：数据采集输入卡
NI PXIe-6363数据采集输入卡中文资料：
NI PXIe-6363数据采集输入卡必须注意，与此串行端口的连接符合共模电压规范。超过规定值的共模条件将导致传输错误和/或90系列PLC组件损坏。共模规范见附录A。当超过共模电压规范时，必须使用端口隔离器，如GE Fanuc IC690ACC903。有关此端口隔离器的详细信息，请参见附录G。NI PXIe-6363内存波动性术语波动性是指当断电时，某一内存类型是否保留或丢失其内容（数据）的问题。Ŷ易失性内存-当断电时丢失其内容的内存。RAM内存固有的易失性。因此，当PLC关闭时，如果要防止RAM存储器中的数据丢失，则需要备用电池。Ŷ非易失性存储器-断电时保留其内容的存储器。各种类型的PROM（可编程只读存储器）内存都是非易失性的。RAM内存每个Series 90-30 CPU都使用RAM内存作为“工作内存”所使用的RAM芯片为CMOS类型。CMOS RAM是免费金属氧化物半导体、随机存取存储器的缩写。CMOS RAM是一种相对快速、低功耗的存储器，可以很容易地检查（读取）和更改（写入）。NI PXIe-6363
英文资料
Care must be taken that common mode voltage specifications are met for connections to this serial port. Common mode conditions that exceed those specified will result in errors in transmission and/or damage to Series 90 PLC components. Common mode specifications are discussed in Appendix A. When the common mode voltage specification is exceeded, a port isolator such as the GE Fanuc IC690ACC903 must be used. See Appendix G for details on this port isolator. Memory Volatility The term volatility refers to the issue of whether or not a certain memory type retains or loses its contents (data) when power is removed from it. Ŷ Volatile memory - memory that loses its contents when power is removed. RAM memory is inherently volatile. Therefore, when the PLC is turned off, a backup battery is necessary if data loss in RAM memory is to be prevented. Ŷ Non-volatile memory - memory that retains its contents when power is removed. The various types of PROM (Programmable Read-Only Memory) memory are non-volatile.RAM Memory Every Series 90-30 CPU uses RAM memory for its ”working memory.” The RAM chips used are of the CMOS type. CMOS RAM is an acronym for Complimentary Metal-Oxide Semiconductor, Random Access Memory. CMOS RAM is a relatively fast, low power memory that can be easily examined (read) and changed (written to).
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