PC-F984-385
PC-F984-385
PC-F984-385
3.输出电流的选择
输出模块的输出电流(驱动能力)必须大于负载的额定电流。用户应根据实际负载电流的大小选择模块的输出电流。如果实际负载电流较大,输出模块无法直接驱动,可增加中间放大环节。
4.同时接通的输出点数量
选择输出模块时,还应考虑能同时接通的输出点数量。同时接通输出的累计电流值必须小于公共端所允许通过的电流值。如一个220V/2A的8点输出模块,每个输出点可以通过2A的电流,但输出公共端允许通过的电流不是16A(8X2)通常要比此值小得多。一般来说,同时接通的点数不要出同一公共端输出点数的60%。
5.输出的大负载电流与负载类型、环境温度等因素的关系
表1为FX系列PLC的输出技术指标,它与不同的负载密切相关。另外,双向晶闸管的大输出电流随环境温度升高会降低,在实际使用中也应注意。
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