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7 Guidelines for station planning
7.3 Power supply
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XI/ON: XNE-GWBR-2ETH-MB 10/2011 MN05002008Z-EN www.eaton.com
7.3 Power supply
7.3.1 Power supply to the gateway
The gateways XNE-GWBR-2ETH-MB offer an integrated power supply (see also Chapter 4.4.1
Power supply, Page 33).
7.3.2 Module bus refreshing
The number of XI/ON modules, which can be supplied via the internal module bus by the
gateway depends on the modules’ nominal current consumptions at the module bus (see
Table 74: Communication bytes and nominal current consumptions of the XI/ON modules
from the modul bus IMB, Page 139).
With the system supply, it must be ensured that the same ground potential and ground
connections are used. Compensating currents flow via the module bus if different ground
potentials or ground connections are used, which can lead to the destruction of the bus
refreshing module.
All bus refreshing modules are connected to one another via the same ground potential.
The power to the module bus is supplied via the connections 11 and 21 on the base module
of the bus refreshing modules.
If the power supply from the module bus is not guaranteed or if the maximum station size is
exceeded, the software I/O-ASSISTANT generates an error message when the user activates
the menu item [Station] > [Verify].
Attention
The sum of the nominal current consumptions (see Table 74: Communication bytes
and nominal current consumptions of the XI/ON modules from the modul bus IMB,
Page 139) of the used XI/ON modules may not exceed
400 mA .
If a bus refreshing module is mounted, the sum of the current consumptions which
follow the bus refreshing module must not exceed
1.5 A .
Note
The bus refreshing modules which are used in a XI/ON station with XNE-GWBR-
2ETH-MB have to be combined with the base modules XN-P3T-SBB-B or XN-P4T-
SBBC-B (tension clamp) or with the base modules XN-P3S-SBB-B or XN-P4S-SBBC-
B (screw terminals).