Siemens SINEC L2 User Manual

System Description S5-95U, SINEC L2
Figure 1-15. SINEC L2 Network with RS 485 Technology
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e.g., S5-95U programmable controller
SINEC L2 bus connector
SINEC L2 bus connector with switched-on terminating resistor
RS 485 repeater with switched-on terminating resistor
The conditions for installing the network are as follows:
• You can connect a maximum of 127 stations (TLN 0 is reserved for a programmer).
• A maximum of 32 bus loads is permitted per segment (a bus load is either a station or a
repeater).
• You can connect a maximum of 7 repeaters in series.
Table 1-7 shows the possible distances between stations calculated on the basis of the expansion
of a bus segment and of the condition specified above that a maximum of 7 repeaters is allowed
between two stations.
Table 1-10. Distance Table for RS 485 Technology
Baud Rate in
Kbits/s
9.6; 19.2; 93.75
Number of Segments Connected in Series
1
1.2 km
3
3.6 km
8
9.6 km
2
2.4 km
5
6.0 km
2.0 km
1.0 km
6
7.2 km
2.4 km
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7
8.4 km
500
1500
0.4 km
0.2 km
1.2 km 3.2 km0.8 km
0.4 km 0.6 km
4
4.8 km
1.6 km
0.8 km
2.8 km
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!
Caution
In extensive networks, the potential difference between two stations may be more than
± 7 V. In such a case, take the necessary equipotential bonding measures, otherwise
the SINEC L2 interface will be destroyed.
1-22 EWA 4NEB 812 6112-02

Siemens SINEC L2 Specifications

General

Brand	Siemens
Model	SINEC L2
Category	Controller
Language	English