8
Siemens
A6V11157961_en--_d
Building Technologies
2018-07-24
Ring topology
Wireless M-bus devices
Web server permits wireless read out using various network topologies. The RF converter is
self-organizing and searches for the optimum connection to the web server (mesh network).
RF network topology
5 m
5 m
5 m
5 m
5 m
5 m
5 m
5
m
5 m
M-bus wired devices
Address
M-bus uses two types of addresses to recognize devices:
●
Primary addressing: Up to 250 primary addresses can be assigned to an M-bus system.
The primary address is normally assigned during device commissioning.
●
Secondary addressing: Secondary addressing consists of 8 bytes and permits the
assignment of any number. In the default setting, the secondary address for a device
matches the serial number issued by the device manufacturer. The assignment prevents
address conflicts on the bus.
Bus expansion
Plant type
Maximum
distance
Total cable
length
Cable cross-
section
Number of
devices (slaves)
Max.
transmission rate
Small residential
buildings
350 m
1000 m
0.8 mm
2
250
9600 baud
Large residential
buildings
350 m
4000 m
0.8 mm
2
250
2400 baud
64
9600 baud