Wiring
6.5 Wiring front connectors
S7-300, CPU 31xC and CPU 31x: Installation
6-8 Operating Instructions, Edition 08/2004, A5E00105492-05
Requirements
The modules (SM, FM, CP 342-2) are mounted on the rail.
Preparing the front connectors and cables
Warning
There is a risk of contact to live wires if the power supply module, or any additional load
power supply units, are connected to the mains.
You should therefore isolate the S7-300 from power before you start wiring it. Close all front
panels of the modules when you completed the wiring. This is conditional before you
reconnect the S7-300 to power.
1. Switch off the power supply.
2. Open the front panel.
3. Place the front connector into wiring position.
Push the front connector into the signal module until it latches. In this position, the front
connector still protrudes from the module.
Advantage of this wiring position: Comfortable wiring.
The front connector pins do not contact the module in this wiring position.
4. Strip the conductors to a length of 6 mm.
5. Crimp the wire end ferrules, for example, to terminate two conductors at one terminal.
CPU
PS
21
23
22
The figure illustrates the following
(1) The switched off power supply module (PS)
(2) The opened module
(3) The front connector in wiring position
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