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Note!
The initialization settings described here are indispensable for operation on a dial-up modem.
Nevertheless, it cannot be guaranteed that data are transferred after the initialization settings
have been adjusted. Due to the broad range of modems available on the market and the differ
-
ent commands, refer to the operating manual of the modem for further details.
9.4 Meter bus interface
The district heating controller can communicate with up to 3 heat and water meters according to
EN 1434-3.
Details on the use of the different heat or water meters can be found in the technical documenta
-
tion TV-SK 6311.
9.4.1 Activating the meter bus
To successfully transfer data from the heat meter (WMZ) to the district heating controller, the
heat meter must use a standardized protocol in accordance with EN 1434-3. It is not possible to
make a general statement about which specific data can be accessed in each meter. For details
on the different meter makes, refer to the technical documentation TV-SK 6311. All necessary
function block parameters to set up the communication with heat or water meters are available
in Co9 -> Fb21 to Fb23. The meter bus address, model code and reading mode need to be set
in sequence. A meter bus address must be unique and correspond with the address preset in the
WMZ.
If the preset meter bus address is unknown, a single heat meter connected to the controller can
be assigned the meter bus address 254. The address 255 deactivates the communication with
the respective WMZ. The model code to be set for the heat meter can be found in TV-SK 6311.
In general, the default setting of 1434 can be used for most devices.
The meters can be read either automatically approx. every 24 hours (24h), continuously (con) or
when the coils (= Modbus data points) assigned to the heat meters WMZ1 to WMZ3 are overwrit
-
ten with the value 1 (CoiL) via the system bus interface.
In InF9 info level, “1434“ is displayed when the meter bus is activated. Press the enter key to get
to the display referring to the meter bus. For each of the three heat meters whose address is
not 255, “buSi“ (with i = 1, 2, 3) is indicated. Press the enter key again to display the following
information about the associated meter:
4
Flow rate (d, cm/h)
4
Total capacity (U, cm
3
)
4
Capacity (P, kW)
4
Energy (A, MWh, GJ)
EB 5179 EN 81
Communication