Connecting Bus Segments - Siemens SIMATIC S5 Manual

Installation Guidelines
2.3.3

Connecting Bus Segments

This section explains how you connect bus segments to the L2 repeater.
terminate a segment at both ends (i.e., when the terminators are connected, the bus is terminated).
Repeater at Segment End
Figure 2-7 shows the connection of two segments to a repeater.
Segment 1
PLC PLC
Connect terminators
for bus segment 1
and for bus segment 2.
Bussegment 1
Segment 1
PLC
e.g., S5-95U programmable controller
SINEC L2 bus connector (terminating resistor connected)
SINEC L2 bus connector (terminating resistor disconnected)
Repeater with terminating resistors connected
Figure 2-7. Connecting Two Bus Segments to Screw-Type Terminals of the L2 Repeater (1)
2-6
PLC
Setting:
"Bus terminated"
Bussegment 2
Segment 2
PLC PLC
PS 24V
Both of the A terminals and both of
the B terminals of a bus segment
are jumpered internally (no gain).
The data signal is amplified and
regenerated only between the "bus
segment 1" and "bus segment 2"
terminal blocks.
Segment 2
S5-95U, SINEC L2
Note that you must
PLC
AG
EWA 4NEB 812 6112-02