Manual VIPA System 200V
Chapter 6 CP 240 - M-Bus
HB97E - CP - Rev. 11/30
6-3
Basics
The M-Bus system (
M
etering
Bus
) is an European standardized (DIN EN
1434-3) two-wire field bus for the excise data capturing. At this the data
transfer happens serial via a polarity inversion secure two-wire core from
slave systems (measuring devices) to a master system.
The M-Bus has been developed in Germany by Prof. Dr. Horst Ziegler (Uni
Paderborn) together with the companies Techem and Texas Instruments.
The main advantage of the M-Bus technique is its high flexibility. Due to the
standardization you may easily combine devices of several manufacturers
at one bus. Also the inclusion of emitter counter is possible via special M-
Bus adapters. Up to 250 counters may be connected at one bus.
•
Polarity inversion secure standardized bus system acc. DIN EN 1434-3
•
Short-circuit resistant M-Bus interface
•
Current, gas, water and heat counter can be integrated
•
Data is read electronically
•
Connection of up to 250 counter at one bus
•
Counter are individually addressable via unique addresses
•
Remote reading possible in dense read intervals
•
Extraction of statistic data as base for net optimization
•
No special requirements for bus cables or cabling topologies
•
Striking distance up to several km
The data transfer from master to slaves happens via the modulation of the
voltage supply. Here at 36V account for the state "1" and 24V for state "0".
The slave system responds the master via the modulation (increase) of its
current consumption. Herat 1.5mA account for the state "1" and 11-20mA
for state "0".
Due to the voltage modulation and thus the present M-Bus voltage of 24V
the terminal equipment can be supplied with the necessary operating
voltage.
M-Bus
Properties
Transfer principle
Содержание CP 240 RS232
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