对于槽 1 CPU 产生一条模块丢失的诊断信息。自动配置时模块不同: 如果某槽以前被配置为某类型的模块但自动配置时实际 插在该槽的是一不同的模块，CPU 将产生一条配置不匹配的诊断信息。该槽 配置为原模块类型。 PLC 问世以来，尽管时间不长，但发展迅速。为了使其生产和发展标准化，美国电气制造商协会 NEMA(National Electrical Manufactory Association) 经过四年的调查工作

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