Installation Instructions

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Siemens Desigo Room automation - Engineering, mounting and installation CM111043en_14
Smart Infrastructure Island bus 2020-10-30
12 Island bus
This chapter is only a brief overview of the island bus installation.
The TX-I/O engineering and installation guide 10562 [7] includes detailed
information on island bus wiring and island bus extension for PXC3 room
automation stations and TX-I/O modules.
· Island bus and island bus expansion are designed for indoor use in one building
only.
· PXC3 room automation stations each have switchable TX-I/O DC 24 V / 600 mA
module power supply. They are switched on at the factory.
The following diagram displays basic wiring variants of the island bus together with
the room automation station:
– TX-I/O modules on the same standard rail as the PXC3.
– TX-I/O modules on a different standard rail, connected via an additional bus
connection modules X1, X2.
– TX-I/O modules on a different standard rail, connected via an additional power
supply module U2.
– TX-I/O modules in an offset installation box; connected via island bus
extension modules U4, U5.
Island bus
Island bus-Extension
AC 24 V
N1 PXC3 room automation station.
X1, X2 TXS1.EF10 Bus connection modules
U2, U3 TXS1.12F1 0Power supply modules
U4, U5 TXA1.IBE Island bus extension modules
· The bus connection module (X1) must be placed at the end of the TX-I/O row.
Modules to the right side of the bus connection module would otherwise have no
supply of AC 24 V.
· The island bus extension modules (U4, U5) may be anyplace in their TX-I/O
row. For signal quality reasons, however, the best place is directly after the
power supplying device
Key
Notes