1769-IF16C
1769-IF16C
1769-IF16C
1． 输出方式的选择
开关量输出模块有三种输出方式：继电器输出、晶闸管输出和晶体管输出。继电器输出的价格便宜，既可以用于驱动交流负载，又可用于直流负载，而且适用的电压大小范围较宽、导通压降小，同时承受瞬时过电压和过电流的能力较强。但它属于有触点元件，其动作速度较慢、寿命短，可靠性较差，因此，只能适用于不频繁通断的场合。当用于驱动感性负载时，其触点动作频率不过1Hz。
对于频繁通断的负载，应该选用双向晶闸管输出或晶体管输出，它们属于无触点元件。但双向晶闸管输出只能用于交流负载，而晶体管输出只能用于直流负载。
2．输出接线方式的选择 按PLC的输出接线方式的不同，一般有分组式输出和分隔式输出两种，
如图5-16所示。
分组式输出是几个输出点为一组，共用一个公共端，各组之间是分隔的，可分别使用不同的电源。而分隔式输出的每一个输出点有一个公共端，各输出点之间相互隔离，每个输出点可使用不同的电源。主要应根据系统负载的电源种类的而定。一般整体式PLC既有分组式输出，也有分隔式输出。
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