Siemens SIMATIC S7-300 - Manual (Page 21)

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SIMATIC S7-300 Getting Started for First Time Users
Getting Started, 04/2007, 6ZB5310-0NC02-0BA0
Installing modules on the mounting rail
1. Install the power supply, tighten-
ing the screws hand-tight.
2. Install the CPU 312C.
3. Insert the front panel connector into the CPU 312C until it engages.
The front panel connector still protrudes from the module in this wiring posi-
tion, and is not yet connected to the module. This position makes it easier for
you to complete the wiring.