Siemens S7-400 - Wiring Rules

Wiring the S7-400
4-18
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
4.11 Wiring Rules
Lines and Tools
For wiring the S7-400 modules, there are some rules for the cables and for the tool
you use. Information on connecting an M7-400 module assembly can be found in
Section 8.5.
Rules for ... Power Supply ... Front Connectors
Crimp terminal Screw-type
terminal
Spring-type terminal
Conductor
cross-sections:
Outer diameter: 3 to 9 mm
Flexible cond.
without wire end
ferrule
no 0.5 to 1.5 mm
2
0.25 to 2.5 mm
2
0.08 to 2.5 mm
2
Flexible cond. with
wire end ferrule
230 VAC: flexible
sheathed cable
3  1.5 mm
2
24 VDC: flexible
sheathed cable
3  1.5 mm
2
or
individual wires
1.5 mm
2
no 0.25 to 1.5 mm
2
0.25 to 1.5 mm
2
No. of conductors
per terminal
1 1 1
*
1
*
Stripping length of
single conductors
7 mm 5 mm 8 to 10 mm without
ferrule
10 mm with ferrule
8 to 10 mm without
ferrule
10 mm with ferrule
Wire end ferrules 230 VAC: with
insulating collar to
DIN 46228 E1,5-8
24 VDC: without
insulating collar to
DIN 46228, shape A,
short version
- with or without
insulating collar to
DIN 46228 Part 1
or 4, Shape A,
normal version
with or without
insulating collar to
DIN 46228 Part 1 or
4, Shape A, normal
version
Blade width and
shape of the screw
driver
3.5 mm (cylindrical
shape)
- 3.5 mm (cylindrical
shape)
0.5 mm x 3.5 mm
DIN 5264
Tightening torque:
for connecting
conductors
0.6 to 0.8 Nm - 0.6 to 0.8 Nm -
*
You can also connect a combination of two conductors of up to 1.0 mm each to a screw-type
or spring-type terminal. You must use special wire end ferrules for this purpose. Two types
and manufacturers of such ferrules are given below:
• Phoenix TWIN Type no. 32 00 81 0, for 2 x 1 mm
2
• AMP Order no. 966 144-4, for 2 x 1 mm
2