IC693ACC303
IC693ACC303开关量I/O模块的选择——输入模块有交流输入和直流输入两种类型。交流输入方式接触可靠、适合有油雾、粉尘的恶劣环境下使用。直流输入的延迟时间短，还可以与接近开关、光电开关等电子输入开关连接。输入电压5V、12V、24V属低电平，传输距离不宜太远，如5V模块最远距离不得超过10m，距离较远的设备应选用较高电压的模块。
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