5511-185 GB-DE-DK/03.2005/Rev. E1
12
9. Example of M-Bus network
It is possible to have more than one M-Bus Cascade unit in the same system, thereby
increasing the number of MULTICAL
®
energy meters.
All M-Bus Slaves can be read from point A.
From point B M-Bus Slaves in subnetworks 1 and 2 can be read.
From point C all M-Bus Slaves in subnetwork 2 can be read.
M-Bus Cascade unit = Total number of M-Bus Slaves Total cable length
Master Module + Master 0.5/0.8 mm
2
1 0 40 1000/1800 m
1 38 + 40 = 78 2000/3600 m
2 38 + 38 + 40 = 116 3000/5400 m
3 38 + 38 + 38 + 40 = 154 4000/7200 m
4 38 + 38 + 38 + 38 + 40 = 192 5000/9000 m
5 38 + 38 + 38 + 38 + 38 + 40 = 230 6000/10800 m
6 38 + 38 + 38 + 38 + 38 + 38 + 22 = 250 7000/12600 m
Usefull numbers:
PcM-Bus software for Windows 98/2000/XP S75-30-007
Table on number of M-Bus Slaves/cable lenght
as a function of the number of extension units
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