User Manual

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Building Technologies M-bus System CE1P5361en
HVAC Products 7 Technical data 08.02.2007
7.4 Cable length charts
In the following charts, "n" denotes the number of M-bus devices connected to the M-
bus segment. The SONOHEAT
®
heat meters with an M-bus module up to V1.06 pro-
duce a bus load of 1.5. This means that a SONOHEAT
®
heat meter with an M-bus
module up to V1.06 corresponds to 1.5 devices. All other devices and SONOHEAT
®
with an M-bus module of V2.01 or higher correspond to 1 bus load.
n
5361D01
l [m]
Cable lengths based on a cable diameter of 0.6 mm
l Cable length [m]
n Number of M-bus devices
Maximum cable length with equidistant distribution of the M-bus devices (slaves)
Maximum cable length if all M-bus devices (slaves) are connected to the end of the cable
Same as ; communication works in spite of a short-circuit on one of the M-bus devices (slave)
(M-bus component TSS721)
0
1000
2000
3000
4000
5000
6000
7000
8000
10 20 40 60 80
100 120 140 160 180 200 220 240
n
5361D03
l [m]
Cable lengths based on a cross-sectional area of 1.0 mm
2
l Cable length [m]
n Number of M-bus devices
Maximum cable length with equidistant distribution of the M-bus devices (slaves)
Maximum cable length if all M-bus devices (slaves) are connected to the end of the cable
Same as ; communication works in spite of a short-circuit on one of the M-bus devices (slave)
(M-bus component TSS721)
Note