Rockwell-automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual Manual do Utilizador descarregar pdf (Página 83)

71 Publication 1794-UM064B-EN-P - May 2014

Chapter

Connect Your Adapter to the PROFIBUS DP

Network

Overview

Read this chapter to install the input and output analog modules.

The DP Physical Layer

The PROFIBUS network media is a balanced transmission line corresponding to

the standard EIA RS-485, terminated at both ends. Both line A and line B types

are available, depending on your system requirements.

Specifications and guidelines for DP media:

• linear bus, terminated at both ends

• drop cables (preferably no longer than .30 m), no branches

• shielded twisted pair

• max. line length between 100 and 1200 m (depending on baudrate and

cable type)

•number of stations: 32

• DP baudrates: 9.6, 19.2, 93.75, 187.5, 500 Kbit/s, 1.5 Mbit/s, 12 MBd

Use the following table to determine what line type will best meet your needs.

For Information On Page

The DP Physical Layer

Cabling and Equipment Required for Line A Type

Cabling and Equipment Required for Line B Type

Connect the Adapter to the Network

Terminate the Network

Line Type Characteristics

Characteristic Bus Segments and Drop Cables

(1)

Line A Requirements

(2)

Line B Requirements Total Capacity of

all Drop Cables

Impedance 135…165 Ω (3-29 MHz) 100…130 Ω (f> 100 kHz)

Capacity < 30 pF/m < 60 pF/m

Resistance < 110 Ω/km –

Wire Gauge > 0.64 mm > 0.53 mm

Conductor Area > 0.34 mm > 0.22 mm

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Rockwell-automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual Manual do Utilizador Página 83