Operating Instructions

ENSiemens Building Technologies A6V10816676_----_d 101
Addressing
Each metering device is assigned a unique ID number (device number) from
the factory. This ID is transmitted by the metering device to the M-Bus system
as a secondary address.
The metering device data are generally queried using this secondary address.
Transmission of the cold quantity
In the case of device types with combined heat/cold metering (WFN..), a
virtual second metering device with the serial number of the heat meter +1 will
be displayed in the M-Bus system. This device is assigned the medium “Cold”
in the data record.
E.g.: ID Heat 00.123.456 ID Cold 00.123.457
Readout parameters heat/cold metering
The following parameters are read out of the heat meter and transmitted to the
M-Bus control unit:
• Device number (8-digit)
• Medium/software version
• Time/date
• Error status (readout 5 or 45
times per day)
• Error date
• Current consumption values
(heat or cold, volume)
• Due date
• Due date value (heat or cold)
Optional via application selection: • 15 monthly values (heat or cold)
• Flow
• Capacity
• Energy
• Supplreturno
temperature
Transmission of impulse values
If water meters with impulse output are connected to the heat meter, the heat
meter transmits the impulse measurement data in addition to the heat meter-
ing data.
Readout parameters impulse measurement
• Device number (8-digit)
• Medium/software version
• Time/date
• Error status (readout 5 or 45
times per day)
• Error date
• Current consumption values
• Due date (identical to heat meter)
• Due date value
Optional via application selection: • 15 monthly values