29
UMG 96RM-P/-CBM
Bus structure
• All devices are connected in a bus structure (line) and
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
120Ohm, 1/4W) at the beginning 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 connection,
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.
SlaveSlaveSlave
Slave Slave Slave Repeater
Slave Slave Slave Slave
Master
Power supply necessary
Bus terminator on
T
T
T
T
Fig. Bus structure
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