Siemens Simatic S7-1500

Hardware section
2.3 Wiring
S7-1500
Getting Started, 05/2014, A5E03981761-AC
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2.3.7
Wiring the digital output module
Procedure
1. Insert the front connector into the pre-wiring position.
2. Use terminals 40 (M) and 39 (L+) from the digital input module to feed the supply voltage
DC 24 V from the digital input module to terminals 20 (M) and 19 (L+).