Basic Documentation

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Siemens M-bus level converter and M-bus web server A6V11157985_en--_f
Smart Infrastructure Engineering 2021-06-21
If using cable with a cross-section of 0.6 mm
2
, you must cut the information in half
on "Maximum distance" and "Number of devices" from the following table.
Plant type Maximum
distance
Total cable
length
Cable
diameter
Number
of
devices
(slaves)
Max.
transmission
rate
Small
residential
buildings
350 m 1000 m 0.8 mm
2
500 (250
per line)
9600 baud
Large
residential
buildings
350 m 4000 m 0.8 mm
2
500 (250
per line)
2400 baud
64 9600 baud
Small
developments
1000 m 4000 m 0.8 mm
2
64 2400 baud
Large
developments
3000 m* 5000 m 1.5 mm
2
64 2400 baud
Direct vicinity 5000 m* 7000 m 1.5 mm
2
16 300 baud
Point-to-point
connection
10000 m* 10000 m 1.5 mm
2
1 300 baud
*Shielded cabling required at a distance in excess of 1000 m
(see EN13757-2 appendix E).
M-bus Condition Minimum Typical Maximum Unit of
measure
Number of unit M-
bus loads
WTV531-GA5060 0 60
WTV676-HB6035 0 20
WTX631-GA0090 0 250
Transfer rate C
Segment
<= 382 nF 300 2400 9600 Baud
Bus voltage WTV531-GA5060 30 39 40 V
WTV676-HB6035 24 40 42 V
Bus current WTV531-GA5060 0 90 mA
WTV676-HB6035 0 30 mA
Bus expansion
Signal specification