Rockwell-automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual Uživatelský manuál stáhnout pdf (Strana 84)

Publication 1794-UM064B-EN-P - May 2014

72 Connect Your Adapter to the PROFIBUS DP Network

Cabling and Equipment

Required for Line A Type

Line A cabling can support baudrates as high as 1.5 Mbits/s.

Cables

You need a shielded twisted pair cable for your cabling (bus segments or drop

cables). Any line A cable available on the market can be used to connect your

adapter to a PROFIBUS network.

T-junction Connectors

You need t-junction connectors to connect your droplines to bus segments. You

can use any t-junctions available on the market.

Termination Blocks

Termination blocks are only needed if the devices on the end of the network do

not have built-in terminating resistors. If you need termination blocks, you can

use any termination blocks available on the market.

Maximum

Length

with Baud

Rate

(bits/s) of:

≤ 19.2

1200 m 1200 m ≤ 15 nF

93.75 k 1200 m 1200 m ≤ 3 nF

187.5 k 1000 m 600 m ≤ 1 nF

500 k 400 m 200 m ≤ 0.6 nF

1.5 M 200 m NA ≤ 0.2 nF

12 M 100 m

Where: NA = Not Applicable

(1)

Measurements are the sum of all bus segments and drop cable lengths combined.

(2)

If using a combination of both line types, divide the lengths shown by two.

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)

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 152 153

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Rockwell-automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual Uživatelský manuál Strana 84