Communication
Note!
The initialization settings described here are indispensable for operation on a
9.4Meter bus interface
The district heating controller can communicate with up to 3 heat and water meters according to EN
Details on the use of the different heat or water meters can be found in the technical documenta- tion
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
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
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:
Flow rate (d, cm/h) Total capacity (U, cm3) Capacity (P, kW) Energy (A, MWh, GJ)
EB 5179 EN 81