Hardware section
2.3 Wiring
3. Move the front connector from the pre-wiring position to its final position. By doing this,
you create an electrical connection between the front connector and the module.
4. Tip: Pre-wired front connectors, e.g. for replacing modules, can be inserted directly.
Result
The front connectors are now wired.
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Getting Started, 05/2014, A5E03981761-AC
S7-1500