Siemens SIMATIC NET PROFIBUS manual Segments for Transmission Rates up to a Maximum of 500 Kbps

Configuring Networks

Note

The power supply to terminating resistors must not be interrupted by turning off the DTE or repeater or by unplugging the bus connector or tap line. If the power supply to the terminating resistors cannot be guaranteed, the PROFIBUS terminator must be used.

3.1.1Segments for Transmission Rates up to a Maximum of 500 Kbps

Transmission Rates up to a Maximum of 500 Kbps

The following maximum segment lengths can be implemented with the SIMATIC NET PROFIBUS LAN cables:

Table 3-1 Possible Segment Lengths

		Segment Length for Cable Type
Transmission Rate	– FC Standard Cable		– FC Trailing Cable
	– FC Robust Cable		– PROFIBUS Flexible Cable
in Kbps
	– FC FRNC Cable		– PROFIBUS Festoon Cable
	– FC Food Cable
	– FC Underground Cable
	– SIENOPYR–FR Marine Cable
9.6	1000 m		900 m
19.2	1000 m		900 m
45.45	1000 m		900 m
93.75	1000 m		900 m
187.5	1000 m		700 m
500	400 m		400 m

The maximum permitted number of bus attachments (DTEs, repeaters, OLMs, BT12 M,...) to one segment is 32.

PROFIBUS Networks SIMATIC NET	3-3
6GK1970-5CA20-0AA1 Release 2 05/2000