The fourth part (Chapter VI) introduces grab cranes intelligent control software structure, the PLC configuration, but also detailed write truck, car, or opening and closing from the software program.
第四部分（第六章）主要介绍抓斗起重机智能控制的软件结构，PLC组态、还详细写出大车、小车、起升开闭机构的软件程序。
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