Wiring
6.1 Requirements for wiring the S7-300
S7-300, CPU 31xC and CPU 31x: Installation
6-2 Operating Instructions, Edition 08/2004, A5E00105492-05
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Wire the front connector Screwdriver with a 3.5-mm blade, side-cutters,
stripping tool
Flexible cables, 0.25 mm
2
to 0.75/1.5 mm
2
Shielded cables as required
Wire end ferrules to DIN 46228
Wiring conditions for PS and CPU
Table 6-3 Wiring conditions for PS and CPU
Connectable cables to PS and CPU
Solid conductors No
Flexible conductors
• without wire end ferrule
• With wire end ferrule
0.25 mm
2
to 2.5 mm
2
0.25 mm
2
to 1.5 mm
2
Number of conductors per terminal 1 or 2, up to 1.5 mm
2
(total) in a common wire
end ferrule
Diameter of the conductor insulation max. 3.8 mm
Stripped length 11 mm
Wire end ferrules to DIN 46228
• without insulating collar
• with insulating collar
Design A, 10 mm to 12 mm length
Design E, up to 12 mm length
Wiring conditions for front connectors
Table 6-4 Wiring conditions for front connectors
Front connectors
Connectable cables
20-pole 40-pole
Solid conductors No No
Flexible conductors
• without wire end ferrule
• with wire end ferrule
0.25 mm
2
to 1.5 mm
2
0.25 mm
2
to 1.5 mm
2
0.25 mm
2
to 0.75 mm
2
0.25 mm
2
to 0.75 mm
2
• Mains feed 1.5 mm
2
Number of conductors per
terminal
1 or 2, up to 1.5 mm
2
(total) in a
common wire end ferrule
1 or 2, up to 0.75 mm
2
(total) in a
common wire end ferrule
Diameter of the conductor
insulation
max. 3.1 mm
• max. 2.0 mm for 40-pole
cables
• max. 3.1 mm for 20-pole
cables
Stripped length 6 mm 6 mm
Wire end ferrules to DIN
46228
• without insulating collar
• with insulating collar
Design A, 5 mm to 7 mm length
Design E, up to 6 mm length
Design A, 5 mm to 7 mm length
Design E, up to 6 mm length
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