The time base module provides clocks for the controlling module and the transmitting module.
时基模块为控制模块和传输模块提供时钟；
A diagram checking module for PLC base on IEC61131-3 standard is designed and the module is divided into real-time part and non real-time part.
分实时和非实时两部分设计一个基于IEC61131 - 3标准的可编程逻辑控制器(plc)梯形图检查模块。
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