Siemens simatic ET 200MP, System Manual

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Wiring
6.8 Front connector for the I/O modules
ET 200MP Distributed I/O System
System Manual, 01/2013, A5E03723484-01
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6. Bring the front connector into the pre-wiring position. To do this, hook the front connector
into the bottom of the module and swivel it upwards until the front connector latches
(Figure 6).
Result: In this position, the front connector still protrudes from the module (Figure 7).
However, front connector and module are not yet electrically connected. The advantage
of the pre-wiring position is the convenient wiring.