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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
7-2 A5E00105492-03
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To wire the S7-300, you require the tools and materials listed in the table below.
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connecting the protective conductor to the
rail
Wrench (size 10)
Protective conductor cable (cross-
section ≥ 10 mm
2
) with M6 cable lug
M6 nut, washer, spring lock washer
Adjusting the power supply module to mains
voltage
Screwdriver with a blade width of 4.5 mm
Wiring the power supply module and the
CPU
Screwdriver with a blade width of 3.5 mm,
side-cutter, wire stripping tool
Flexible cable, e.g. sheathed flexible cable
3 x 1.5 mm
2
If required, wire end ferrules to DIN 46228
Wiring the front connector Screwdriver with a blade width of 3.5 mm,
side-cutter, wire stripping tool
Flexible cable 0.25 mm
2
to 0.75/1.5 mm
2
If required, shielded cables
If required, wire end ferrules to DIN 46228
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Table 7-2 Conditions for connecting the PS and CPU
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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 conductor, or 2 conductors 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
Version A, 10 mm to 12 mm length
Version E, up to 12 mm length
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