T H E M O D E R M - B U S T E C H N O L O Y
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3.8
M-Bus master, plint 22-29
The M-Bus master output contains of four parallel outputs that can be used to connect M-Bus
loops. All of the four parallel outputs are fed by the same M-Bus driver.
The picture below shows the connections for the four M-Bus outputs.
Figure 3-12
The base voltage of the M-Bus master output is generally 39-40V.
The masterport will react if there has been an overload or short circuit on the loop. This is
shown by the Power light flashing at different speeds depending on the problem. The user can
also read out the voltage or current on the bus via the internal M-Bus meter inside the PiiGAB
M-Bus 900S/T.
In the PiiGAB M-Bus 900S/T the different master outputs can be turned on or off via the web
interface. See the below picture. It can be found under base configuration in the web interface.
By turning off an output there is no voltage on this partial loop. The purpose of the function is
to be able to trouble shoot locally or remotely on the different M-Bus loops.
Figure 3-13
When
Reboot
or power on all outputs are set to ON.
When
Restart
the outputs keep the output status.
Table 3-2
Plint No Name
Description
22 - 23
M-Bus Master, loop 1
Output ON/OFF 1
24 - 25
M-Bus Master, loop 2
Output ON/OFF 2
26 - 27
M-Bus Master, loop 3
Output ON/OFF 3
28 - 29
M-Bus Master, loop 4
Output ON/OFF 4