NI PXI-6551数字I/O
品牌：NI
型号：NI PXI-6551
产品说明：数字I/O
NI PXI-6551数字I/O中文资料：
NI PXI-2501多路复用器开关模块在任何固定温度下，精度都相对稳定。对于需要更高精度的应用，提供以下建议：Ŷ对于CPU温度稳定的安装，测量24小时内的时间漂移量，然后在梯形图程序中编程“校正”因子，定期增加或减少秒数，以保持CPU时间准确。在这种情况下使用的指令是服务请求#7，“更改/读取日时钟时间”。NI PXI-2501在适当的时间，服务请求将读取TOD时钟，ADD指令将向其添加校正值，另一个服务请求将向TOD时钟写入新值。这种方法的一个可能缺点是，如果更换CPU，则必须确定新的校正系数。此外，这种方法受到温度变化的影响，因此它的成功取决于保持CPU的环境温度稳定。如果需要更高的精度，PLC可以连接到第三方解决方案，如无线电链路或全球定位系统（GPS）卫星系统。NI PXI-2501
英文资料
The accuracy is relatively stable at any fixed temperature. For applications that require greater accuracy, the following suggestions are furnished: Ŷ For an installation where the temperature of the CPU is stable, measure the amount of time drift for a 24 hour period, then program a “correction” factor into the ladder program to add or subtract seconds periodically to keep the CPU time accurate. The instruction to use in this case is Service Request #7, “Change/Read Time-of-Day Clock.” At the appropriate time, a Service Request would read the TOD clock, an ADD instruction would add the correction value to it, and another Service Request would write the new value to the TOD clock. A possible drawback to this method is that if you replace your CPU you will have to determine a new correction factor. Also, this method is affected by temperature changes, so its success is based on holding the CPU’s ambient temperature stable.If more accuracy is needed, the PLC could be interfaced to a third party solution such as a radio link or Global Positioning System (GPS) satellite system.NI PXI-2501
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