串口2支持RS-232或RS-485应用，模板可以由配置软件或默认安装进行配置.因为两个串口都同模板上的单连接器接线，IC693CBL 305 Y型电缆提供了模板上分离的两个端口的接线，–个具有331或更高级的CPU的系统可以有多四个的CMM只能用于CPU基板中).文字数字显示协处理器(IC693ADC31 1)是系列90-30 PLC CPU的一-个协处理器并且用于–个CIMPLICITY 90-ADS系统中，

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