Siemens SIMATIC NET Manual de instrucciones - Página 10

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Introduction

1.2 Description of the product

Segment length and transmission speed

Transmission speed

9.6 - 187.6 kbps

500 kbps

1.5 Mbps

3 - 12 Mbps

Permitted segment lengths

Bus cable for PROFIBUS, standard type (see catalog IK PI).

Note

Restriction when using the 12M bus terminal at 500 kbps

This restriction only affects segments longer than 80 m.

If the 12M bus terminal is used at a transmission rate of 500 kbps along with several RS-485

bus terminals with a spur line length of 3.0 m, a minimum distance of 5 m of PROFIBUS

cable must be maintained between two RS-485 bus terminals.

You can locate 12M bus terminals anywhere in the segment; there is no minimum distance

between them that needs to be kept to. You can also arrange a 12M bus terminal between

two RS-485 bus terminals with 3.0 m spur lines if you make sure that the PROFIBUS cable

between two RS-485 bus terminals has a total length of at least 5 m.

maximum segment length

800 m

400 m

200 m

100 m

Operating Instructions, 07/2013, C79000-G8976-C333-01

12M bus terminal