After determining the points and properties of the input and output of the PLC,the model and quantity of various I/O templates can be further determined.Specifications of switch I/O templates are 4,8,16,32,and 64 points.Templates with many points have a relatively low average price per point.The external wiring mode of the switch I/O template can be divided into isolation type and sink type.The average price of each point of the isolation type is higher.If isolation is not required between signals,a sink-type I/O template should be used.In the integral PLC machine,each I/O terminal is also divided into isolation type and sink type to meet the needs of input/output devices of different voltage levels.
在确定了PLC的输入量和输出量的点数及性质后,就可以进一步确定各种I/O模板的型号和数量。开关量I/O模板的规格标准有4、8、16、32、64点,点数多的模板,每点平均价格相对较低。对开关量I/O模板的外部接线方式可分为隔离式和汇点式,隔离式的每点平均价格较高。如果信号之间不需要隔离,应选用汇点式的I/O模板。在整体式PLC机中,各个I/O端子也有隔离式和汇点式之分,以满足不同电压等级的输入/输出器件的需要。
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