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UMG 96-PA
29
8. 3
Bus structure
• All devices are connected in a bus struc-
ture (line).
• Each device has its own address within the
bus (see also Parameter programming).
• Up to 32 subscribers can be connected
together in a single segment.
• The cable is terminated with resistors (bus
termination 120 Ohm, 1/4 W) at the begin-
ning and at the end of a segment.
• With more that 32 subscribers, repeaters
(amplifiers) must be used to connect the
individual segments.
• Devices for which the bus connection is
switched on must be under current.
• It is recommended that the master be
placed at the end of a segment.
• If the master is replaced with a bus con-
nection, the bus must be switched off.
• Replacing a slave with a bus connection
that is either switched on or de-energised
can destabilise the bus.
• Devices that are not connected to the bus
can be replaced without destabilising the
bus.
Slave
Fig. Bus structure
Slave
Slave
Slave
Repeater
Slave
Slave
Slave
Master
Power supply necessary
Bus terminator on
T
T
T
T
T
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