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Siemens SIMATIC NET PROFIBUS User Manual

Page 110

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Passive Components for RS-485 Networks

4-12

PROFIBUS Networks SIMATIC NET

6GK1970-5CA20-0AA1 Release 2 05/2000

Properties

The characteristics of the flexible cable differ from those of the standard LAN cable
as follows:

S

The sheath material is free of halogens (polyurethane, PUR)

S

Extremely good resistance to abrasion

S

Resistant to mineral oils and grease

S

Extremely good resistance to UV radiation

S

Small bending radii for installation and operation

S

Due to the smaller Cu cross-section, the d.c. loop resistance and the HF
attenuation are higher which means reduced segment lengths.

S

The sheath material is flame resistant

Uses

The flexible cable is designed for torsion of

±

180

o

and is therefore particularly

suitable for networking moving plant parts, for example robots.

Note

If you connect to screw terminals, the stranded cores must be fitted with wire-end
ferrules (0.25 mm

2

complying with DIN 46228). Use only wire-end ferrules made of

materials with permanently stable contact properties, for example copper with a
tin-plated surface (not aluminum).
The bus connector 6ES7 972-0BA30-0XA0 cannot be connected to the stranded
cores.