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Siemens TX-I/O Engineering and installation guide CM110562en_13
Building Technologies Principles of electrical design 2019-05-15
10.6.6 Wiring examples for island bus expansion
Wiring of the island bus expansion can be executed in different ways, depending on
– the earthing kind of the system (PELV, SELV)
– the cables used (Cat 5, RS-485, RG-62).
Admissible cable types are described in 10.6.4.
Admissible cable lengths see above, rule 19.
When choosing a protection system (PELV, SELV), local safety regulations must be
observed.
A simple and effective installation is achieved with PELV earthing and CAT 5 (AWG24)
cable.
Key
Earthing and installation examples contain the following elements:
Automation station with island bus connector + power supply module TXS1.12F10
Bus Interface Module with built-in power supply TXB1.P-BUS
PROFINET BIM TXB1.PROFINET + power supply module TXS1.12F10
Power supply module TXS1.12F10
Bus connection module TXS1.EF10
Island bus expansion module TXA1.IBE
TX-I/O module TXM1....
Cable island bus
Cable island bus expansion
• Earthing of the screens (
, all examples):
When you expect medium or high EMC disturbance, we recommend earthing of the
screens (on both ends) as described on page 50.
• Earthing of field devices (not shown in the examples):
Earthing (e.g. external sensor power) should be avoided.
The following illustrations show wiring examples for different earthing kinds (PELV,
PELV) and different cables.
Notes on earthing