Siemens S7-400 installation manual Wiring Rules, Lines and Tools

Wiring the S7-400

4.11Wiring Rules

Lines and Tools

For wiring the S7-400 modules, there are some rules for the cables and tools to use.

Rules for	... Power Supply		... Front Connectors
		Crimp terminal	Screw-type	Spring-type terminal
			terminal
Conductor
cross-sections:
Outer diameter:	3 to 9 mm
Flexible cond.	no	0.5 to 1.5 mm2	0.25 to 2.5 mm2	0.08 to 2.5 mm2
without wire end
ferrule
Flexible cond. with	230 VAC: flexible	no	0.25 to 1.5 mm2	0.25 to 1.5 mm2
wire end ferrule	sheathed cable
	3 x 1.5 mm2
	24 VDC: flexible
	sheathed cable
	3 x 1.5 mm2 or
	individual wires
	1.5 mm2
No. of conductors	1	1	1 *	1 *
per terminal
Stripping length of	7 mm	5 mm	8 to 10 mm without	8 to 10 mm without
single conductors			ferrule	ferrule
			10 mm with ferrule	10 mm with ferrule
Wire end ferrules	230 VAC: with	-	with or without	with or without
	insulating collar to		insulating collar to	insulating collar to
	DIN 46228 E1,5-8		DIN 46228 Part 1	DIN 46228 Part 1 or
	24 VDC: without		or 4, Shape A,	4, Shape A, normal
			normal version	version
	insulating collar to
	DIN 46228, shape A,
	short version
Blade width and	3.5 mm (cylindrical	-	3.5 mm (cylindrical	0.5 mm x 3.5 mm
shape of the screw	shape)		shape)	DIN 5264
driver
Tightening torque:	0.6 to 0.8 Nm	-	0.6 to 0.8 Nm	-
for connecting
conductors

*You can also connect a combination of two conductors of up to 1.0 mm each to a screw-type or spring-loaded 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 mm2
•	AMP	Order no. 966 144-4, for 2 x 1 mm2

Note

You must use shielded cables for the analog modules (see Section A.5).

Automation System S7-400	Hardware and Installation	4-17
A5E00850741-01