Siemens RS-485 Wartungshandbuch PDF herunterladen (Seite 270)

Installing bus cables

C.7 Routing electrical bus cables

PROFIBUS Network Manual

270 System Manual, Edition 04/2009, C79000-G8976-C124-03

Table C- 1 Cabling within buildings

Cables for ... and cables for .. lay ...

Bus signals, shielded

(PROFIBUS/Industrial Ethernet)

Bus signals, unshielded (ASInterface)

Data signals, shielded (programming devices,

operator panels, printers, counter inputs, etc.)

Analog signals, shielded

DC voltage ( ≤ 60 V), unshielded

Process signals (≤ 25 V), shielded

AC voltage (≤ 25 V), unshielded

Monitors (coaxial cable)

In common bundles or cable channels

DC voltage

(> 60 V and ≤ 400 V), unshielded

AC voltage

(> 25 V and ≤ 400 V), unshielded

In separate bundles or cable channels

(no minimum clearance required)

Bus signals, shielded

(PROFIBUS, Industrial Ethernet)

Bus signals, unshielded

(AS-Interface)

DC and AC voltage (> 400 V), unshielded Within closets:

In separate bundles or cable channels

(no minimum clearance required)

Outside cabinets:

On separate cable paths with at least

10 cm clearance

C.7.2 Cabling within cabinets

What must be taken into account?

When running cables within cabinets, remember the following rules:

● The minimum clearance between cables of different categories can be found in Section

Cable categories and clearances (Page 268)". In general, the risk of interference due to

crosstalk is less the greater the clearance between the cables.

● Where cables of different categories cross, they must always cross at right angles

(wherever possible avoid sections where the cables run parallel).

● If there is not enough space to maintain a clearance ≥ 10 cm between the individual

categories, install the cables sorted according to category in separate metallic and

conductive channels. You can then arrange these channels next to each other. Screw the

metallic, conductive channels to the struts of the rack or cabinet walls approximately

every 50 cm making lowresistance and lowinductance contact.

● The shields of all cables entering the cabinet must be secured as close as possible to the

point of entry and should make largearea contact with cabinet ground.

● Make sure that you avoid parallel installation of cables entering from outside between the

point of entry to the cabinet and the shield clamp and purely internal cabinet cables, even

if the cables are of the same category.

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