S5-95U, SINEC L2 System Description
1.6 Physical Bus Characteristics and Installation Techniques for the
SINEC L2 Network
You can connect the S5-95U programmable controllers to SINEC L2 networks using two different
types of transmission technologies:
• RS 485 transmission technology
(advantages: interference-proof due to difference signals, and economical)
• Fiber optic transmission technology
(advantages: no EMC problems, electrical isolation between the stations, larger network
expansion capability as with the RS 485)
Refer to the SINEC L2/L2FO Network Manual for detailed information about transmission
technologies.
1.6.1 RS 485 Transmission Technology
Physical bus characteristics and related distances
A SINEC L2 network consists of one or more bus segments.
Figure 1-14 shows a SINEC L2 segment with RS 485 technology.
Figure 1-14. SINEC L2 Bus Segment with RS 485 Technology
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SINEC L2 bus connector
(terminating resistor
connected)
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Bus cable
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SINEC L2
station
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SINEC L2 bus connector
(terminating resistor disconnected)
Data Rate Distance
9.6 Kbits/s
19.2 Kbits/s
93.75 Kbits/s
187.5 Kbits/s
500 Kbits/s
1500 Kbits/s
1.2 km
1.2 km
1.2 km
1.0 km
0.4 km
0.2 km
You can link the bus segments by repeaters. Figure 1-15 shows a SINEC L2 network with RS 485
technology. The terminology is explained later on.
EWA 4NEB 812 6112-02
1-21
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