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SIMATIC PLC SM 1231 Analog Eingang Module S7 1200 6ES 7 231 6ES7231 4HD32 0XB0 4HF32 5ND32 6ES72314HF320XB0 6ES72315ND320XB0|Instrumententeile & Zubehör| - AliExpress
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How to Wire a Digital Input on the SIMATIC S7-1200 PLC | Authorized Siemens Support | AWC, Inc. - YouTube
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SIEMENS SPS SIMATIC S7 1200 Digital Input SM 1221 8 16 DI DC 6ES7221 1BF32 0XB0 1BH32 6ES72211BF320XB0 6ES72211BH320XB0|Instrumententeile & Zubehör| - AliExpress
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