Fieldbus; Profibus; Figure 15 Digital Gateway Profibus Connection And Termination Examples - ABB LVS Digital Manual

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F I ELD BU S

5.4 Fieldbus

The physical medium for PROFIBUS-DP is RS-485, which allows 32 nodes in a single segment

and 125 nodes in a network using 4 segments. Segments must be separated by using

Repeater.

The PROFIBUS interface checks input signal for poll requests from master and detects

automatically requested baud rate. It can work with baud rates up to 1.5M.

Cable length may vary from 80-1200 m depending on transmission speed and repeater type

in use. Cable length can be extended using fiber optic modems (yielding a more robust

network). See reference document 4 for more details on cable connections and wiring.

The connection to the Digital Gateway is achieved via a PROFIBUS Standard Sub-D connector.

In all PROFIBUS networks care must be taken that each end of a segment is terminated cor-

rectly termination must be activated. The Digital Gateway does not provide PROFIBUS Termi-

nation, the recommended method of termination is to utilize the termination switches of the

standard D-types.

In a mixed network, the maximum cable length of drop lines must be considered,

also the max communication speed is less than 1.5 MBaud. See reference docu-

ments 1 & 3 for more information

It is recommended to use external PROFIBUS termination devices. However, if that

is not possible then standard plugs with inbuilt Termination shall be used. The

Termination must be switched ON at both end of the segment. All terminations in

between must be switched OFF

2 2

COM MU NI CAT IO N I NT ERFACE CONNECTI ON

1 TG C90 80 04

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