S7-300的模塊機(jī)架（起物理支撐作用，無(wú)背板總線），西門(mén)子提供五種規(guī)格的導(dǎo)軌。
電源模塊（PS）
將市電電壓（AC120/230V）轉(zhuǎn)換為DC24V，為CPU和24V直流負(fù)載電路（信號(hào)模塊、傳感器、執(zhí)行器等）提供直流電源。輸出電流有2A、5A、10A三種
正常：綠色LED燈亮
過(guò)載：綠色LED燈閃
短路：綠色LED燈暗（電壓跌落，短路消失后自動(dòng)恢復(fù)）
339021AA
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339051AA
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339220
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339306CA7
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339420AX
3SE21000E
3SE21001B
3SE21001C
3SE21001D
3SE21001DV000AH3
671532BA020XB4
671532BA020XB5
671532BA810XB0
671532BA820XB0
671532BB000XB0
671533AA000XB0
671533AA010XB0
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671541AA000AB0
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671544AB100AB0
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671560AA010XA0
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671570AC000XA0
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671570AC810XA0
671570AC820XA0
671570AC830XA0
671570AD800XA0
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671570AF810XA0
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671570AF830XA0
671580AA010XA0
671580AD000XA0
671580AD010XA0
671583AD000XA0
671583AD010XA0
671740AA100AA0
67178H000AE0
3RV10111GA20
3RV10111HA10
3RV10111HA15
3RV10111HA20
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3RV10111JA15
3RV10111JA20
3RV10111KA10
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3RV10210AA10
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3RV10210CA10
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3RV10210GA10
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3RV10210HA10
3RV10210HA15
3RV10210JA10
3RV10210JA15
3RV10210KA10
3RV10210KA15
3RV10211AA10
3RV10211AA15
3RV10211BA10
3RV10211BA15
3RV10211CA10
