| Siemens | - | S7-300 | 28 (24 Digital, 4 Analogue) | Analogue, Digital | SIMATIC S7-300 Series | 24 V dc | Analogue, Digital | 24 | 18 (16 Digital, 2 Analogue) | 24 V dc | - | 16 | - | - | - | RS-485 |
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| Siemens | - | S7-300 | 28 (24 Digital, 4 Analogue) | Analogue, Digital | SIMATIC S7-300 Series | 24 V | Analogue, Digital | 24 | 18 (16 Digital, 2 Analogue) | 24 V dc | Ethernet, Profinet | 16 | - | - | - | Ethernet, PROFINET, RS 485 |
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| Siemens | - | S7-300 | 24 (Digital), 4 (Analogue) | Analogue, Digital | SIMATIC S7-300 Series | - | Analogue, Digital | - | 16 (Digital), 2 (Analogue) | 24 V dc | USB | - | - | - | - | - |
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| Siemens | - | S7-300 | 28 (24 Digital, 4 Analogue) | Analogue, Digital | SIMATIC S7-300 Series | 24 V dc | Analogue, Digital | - | 18 (16 Digital, 2 Analogue) | 24 V dc | - | - | - | - | - | - |
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| Siemens | - | S7-300 | 10 (Digital) | Digital | SIMATIC S7-300 Series | - | Digital | 10 | 6 (Digital) | 24 V dc | USB | - | - | - | - | - |
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| Siemens | - | S7-300 | 16 (Digital) | Digital | SIMATIC S7-300 Series | - | Digital | 16 | 16 (Digital) | 20.4 → 28.8 V dc | - | 16 | - | - | - | RS485 |