TX-I/O Island Bus
TX-I/O Island Bus
A TX-I/O™ island bus is composed of one TC Modular or TC-36, a TX-I/O Power
Supply module, and I/O modules.
Only one controller is used per island bus—either a TC Modular or a TC-36.
The TC Modular supports 64 I/O modules or a maximum of 500 points.
The TC-36 supports two I/O modules (approximately 32 points).
Admissible Number of Devices
TX-I/O Power Supply Module A maximum of four TX-I/O Power Supply modules may be connected in parallel per island
bus.
Bus Connection Points Maximum number bus connection points per island bus: 16
Example
4 TX-I/O Power Supply modules + 12 Bus Connection Modules = 16 bus connection points.
TX-I/O Island Bus Only one controller is used per island bus
TC Modular
Up to 64 modules or a maximum of 500 points
TC-36
Up to two modules (approximately 32 points)
I/O Row Up to two TX-I/O Power Supply modules may be connected in parallel per I/O row.
Structure of the Island Bus Rows
The following devices are combined to create rows of I/O modules in the island bus:
TX-I/O Power Supply module (TXS1.12F4)
Bus Connection Module (TXS1.EF4)
I/O modules
Installation Rules and Limitations
The first device mounted on each island bus row must deliver the bus signal, the I/O
module power supply, and the field device supply. This would be a TX-I/O Power
Supply or Bus Connection Module.
A maximum of four TX-I/O Power Supply modules may be connected in parallel per
island bus.
If the 24 Vdc supply (maximum 1.2 A) is "used up" by the I/O modules and field
devices, an additional TX-I/O Power Supply module is required (operating in
parallel with the first one).
35
Siemens Industry, Inc. TALON TX-I/O Modules and Island Bus Technical Reference
588-587 CONFIDENTIAL: For internal use only 4/6/2010
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