UMG 96-PA
/ UMG 96-PA
MID
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26
8.5 Bus structure
In a bus structure
·all devices are connected in line.
·each device has its own address (see chap.
„12.1 Communication“ on page 34).
·up to 32 participants/devices can be
interconnected in a segment. The cable is
terminated with resistors (bus terminator,
120 ohm, 1/4 W) at the start and end of
a segment.
·Repeaters (line amplifiers) are used for more
than 32 subscribers to connect the segments.
·Devices with an activated bus terminator must
be supplied with power.
·Placing the master at the end of a segment is
recommended. If the master is replaced with an
activated bus terminator, the bus is deactivated.
·The bus can become unstable if a slave is
replaced with an activated bus terminator or is
de-energized.
·Devices, which are not subscribed to the bus
terminator, can be replaced without making the
bus unstable.
Slave
Fig.
IllustratFon of a bus structure
Slave
Slave
Slave
Repeater
Slave
Slave
Slave
Master
Speisung notwendig / power supply necessary
Busabschluss eingeschaltet / bus terminator on
T
T
T
T
T
Master - e.g. UMG 604-PRO
Slave - UMG 96PA
