Siemens SIMATIC S7-1500 Automation System System Manual page 70

Wiring
6.8 Front connector for the I/O modules
6. Bring the front connector into the pre-wiring position. To do this, hook the front connector
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into the bottom of the I/O module and swivel it upwards until the front connector latches
(Figure 6).
Result: In this position, the front connector still protrudes from the I/O module (Figure 7).
However, front connector and I/O module are not yet electrically connected.
Figure 6-10 Preparing front connectors for I/O modules with shield contact element (2)
S7-1500 Automation System
System Manual, 01/2013, A5E03461182-01