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如图所示，通过光耦来隔离24V，光耦的控制信号是通过接插件P2传递，现在在74LS07D和74LVC8T245DWR选择上不知道哪个好，
74LS07D是开漏输出的，可以通过上拉电阻来控制电流，增强驱动能力
选择哪个合适些
