TX-I/O Power Supply and Bus Modules
Bus Connection Module Overview
The Bus Connection Module bridges communication and power from one DIN rail to
another. It provides the bus signal, module supply voltage, and field device supply
voltage to TX-I/O Modules on the additional DIN rail.
The Bus Connection Module performs the following functions:
Passes 24 Vac at 4A to power TX-I/O modules and peripheral devices.
Provides an input point for 24 Vac to power additional peripheral devices.
‒ Isolates the 24 Vac peripheral device supply in case of overload or short-circuit.
‒ The replaceable AC fuse can be accessed from an installed module.
‒ Indicates the AC fuse status with an LED for easy diagnostics.
Routes the bus signal between DIN rails (+24 Vdc Communication Supply (CS)
and Communication Data (CD) signals).
Supply Terminal Connections
24 Vdc is supplied to terminals one and four (CS) and to both ends of the TX-I/O
bus connector for distribution to connected TX-I/O modules and external devices.
24 Vac is passed through an internal fuse from terminals three and four (system
neutral) to the male TX-I/O bus connector.
External devices draw power from the 24 Vdc, 24 Vac, and system neutral
terminals on the TX-I/O modules.
24 Vdc supply terminals are connected in the I/O module, not in the terminal base.
24 Vdc is current-limited in the Bus Connection Module.
TX-I/O Bus Connection Module Specifications
Dimensions (L × W × D)
1.26” × 3.54” × 2.75” (32 mm × 90 mm × 70 mm)
TX-I/O Bus Communication
Signal pass-thru
Power Requirements
24 Vac +/-20% input @ 50 or 60 Hz
Power Output
Pass-thru
24 Vac Power, TXS1.EF4
1
Output and Input: NEC Class 2, 96 VA max. Output fused at 4A
TX-I/O Bus Extension (CS/CD)
164 ft (50 m) total max. using two 14-gauge twisted pair cable
Ambient operating temperature
32°F to +122°F (0°C to 50°C), 5 to 93% rh, non-condensing
UL
UL 864 UUKL Smoke Control Equipment
UL 864 UUKL7 Smoke Control Equipment
UL 916 PAZX
CSA 22.2 No. 205 PAZX7
Agency Compliance
CFR47 Part 15, Class A; CFR47 Part 15, Class B
Australian EMC Framework (C-Tick)
2004/108/EC European EMC Directive (CE)
2006/95/EC European Low Voltage Directive (LVD)
1)
May be used for Smoke Control installations with Smoke Control Listed Enclosures and transformers or service boxes. The line to
the 24 Vac input transformer must not exceed 1000 VA. NEC Class 2 wiring may be used up to 96 VA, and NEC Class 1 Power
Limited wiring must be used above 96 VA and up to 1000 VA.
33
Siemens Industry, Inc.
TALON TX-I/O Modules and Island Bus Technical Reference
588-587
CONFIDENTIAL: For internal use only
4/6/2010