Firstly, the paper investigate the actuality and the developing trend of PLC control system, then put forward the study direction of this paper.
本论文首先对PLC系统的现状和发展趋势进行了相关调研，进而提出了本次课题的研究方向。
Firstly, the paper investigate the actuality and the developing trend of PLC control system, then put forward the study direction of this paper.
本论文首先对PLC系统的现状和发展趋势进行了相关调研，进而提出了本次课题的研究方向。
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