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Siemens TX-I/O Engineering and installation guide CM110562en_13
Building Technologies TX-I/O™ mounting instructions 2019-05-15
4.2 Structure or an I/O island
An I/O island is composed of the I/O modules and of the following elements:
• Desigo TRA: For each I/O island ONE automation station.
• Island bus integration: For each I/O island ONE automation station and a power
supply module.
• Integration via P-Bus BIM: For each I/O island ONE bus interface module (BIM)
with integrated power supply.
• Integration via PROFINET BIM:
For each I/O island ONE bus interface module (BIM) plus a power supply module
or a bus connection module with an external DC 24 V supply.
• Each new I/O row begins with a bus connection module or a power supply module.
• If the DC 24 V supply (max. 1.2 A) is "used up", an additional power supply
module is needed.
• If the AC 24 V field supply (max. 6 A) is "used up", a bus connection module is
needed.
• If a separate fuse or a field supply with a voltage other than AC 24 V is required
(max. 6 A), a bus connection module is needed.
For details, please note the information and instructions concerning control panels in
Section 5.2, "Physical layout", the wiring examples in Section 6.4.2, as well as the
criteria for the deployment of supply modules and bus connection modules in the
principles of electric design, Section 9.7.
4.3 Structure of the I/O rows
The I/O modules are connected to the following devices to create I/O rows:
• Room automation station with island bus connectors
• Automation station with island bus connectors
• Bus interface module (BIM)
• TXS1.12F10 power supply module
• TXS1.EF10 bus connection module
• TXA1.IBE island bus expansion module (optional)
• I/O modules
AS
AS
A
A
A
B
C
The first item(s) on each I/O row must be either one or two devices from category "AS"
or "A" to provide the bus signal, the module supply voltage and the field device supply.
These are then followed by "C", the I/O modules.
Other bus connection modules and a maximum of one more power supply module per
I/O row may be connected between the I/O modules.
An island bus expansion module can be placed anywhere in the I/O row. For signal
quality reasons, however, the best place is directly after device "AS" or "A".