T H E M O D E R N M - B U S T E C H N O L O G Y
PiiGAB Process Information i Göteborg AB
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2.2
Indications
There are three diode lamps on the gateway Pwr, Tx, and Rx.
The Pwr diode lamp provides three different types of information. The red power
diode normally has a firm red light. If the power diode flashes at a 5 Hz frequency
there has been a short circuit on the M-Bus loop. If it flashes at a lower frequency
(1 Hz) the loop has been overloaded. The M-Bus gateway is available as either a
20 or a 60 device master. If those numbers are exceeded there will be a lower
frequency flash.
The Tx diode lamp has a flashing green light when the gateway is sending out a
question onto the M-Bus loop.
The Rx diode lamp has a flashing green light when the gateway receives an
answer from one of the meters connected to the M-Bus loop.
2.3
Technical specifications
Table 2-2. Technical specifications
Connection
Description
Supply voltage
24V AC/DC (local supply)
Rated Current
350mA (24V AC, 60 slaves)
250mA (24V AC, 5 and 20 slaves)
Operating temperature
-20°C till +55°C
Storage temperature
-35°C till +70°C
Dimension
WxHxD 70x86x57
Weight
120 g
Protection type
IP 20
Housing material
Lexan 940 / VO 1550
M-Bus
EN 1434-3
Emission
EN 50 022 class B radiation
EN 50 022 class B conducted
Immission
EN 61 000-4-2
EN 61 000-4-6
ENV 50 140
ENV 50 240
IEC 1000-4-2
2.4
Supply voltage
The gateway should be supplied from a local 24 AC/DC transformer. If using a
central 24 DC power supply you should mount a DC/DC converter between the
gateway and the central power.