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並前往https://support.industry.siemens.com/cs/document/13033418/which-24v-digital-input-modules-need-a-power-supply-and-to-which-pins-must-the-power-supply-be-connected-?dti=0&lc=en-WW

Which 24V digital input modules need a power supply and to ...

The S7-300 digital input modules not listed do not need an external power supply. Module. Power supply connections. L+. M. 6ES7 321-1BH00-0AA0.

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