Siemens SIMATIC S7-1500 Getting Started page 26

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Hardware section
2.3 Wiring
2. Thread in the cable tie.
3. Connect the supply voltage 24 V DC to the terminals 20 (M) and 19 (L+).
4. Insert the potential circuit bridges between the two bottom terminals.
Result
The digital input module is now wired.
26
Getting Started, 05/2014, A5E03981761-AC
S7-1500

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