描述
尽管用PLC实现对系统的控制可不用外部设备，配置好合适的模块就行了。然而，要对PLC编程，要监控PLC及其所控制的系统的工作状况，以及存储用户程序、打印数据等，就得使用PLC的外部设备。故一种PLC的性能如何，与这种PLC所具外部设备丰富与否，外部设备好用与否直接相关。
F-6100-R-H04AA Reliance Electric Servo Motor
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