Engineering Documentation

Chapter 3 – Field Panels
TX-I/O Product Range
125
-3002 91 | 231
TX-I/O Island Bus Guidelines
Power and Communications Specifics Diagram
ALN RS-485; Supervised Figure ALN Trunk Shield
Connection [
➙
47]
FLN RS-485; Supervised
Figure
FLN P1 Trunk Shield
Connection [
➙
48]
Power 24 Vac; Supervised See the TX-I/O Island Bus Wiring
Diagrams
TX-I/O island bus 24 Vdc; Supervised
TX-I/O island bus expansion RS-485; Supervised
Power and Communications Specifics
ALN RS-485; Supervised
FLN RS-485; Supervised
Power 24 Vac; Supervised
TX-I/O island bus 24 Vdc; Supervised
CAUTION
To ensure error free communication and prevent equipment damage, observe the
TX-I/O island bus wiring guidelines in this section.
● All connections to 24 Vac must be home run back to transformer.
● Distribute 24V~ transformer power to additional TX-I/O Power Supplies and Bus
Connection Modules using twisted pair cable in a star configuration.
● Distribute 24 Vdc Communication Supply and Data (CS/CD/ ) from the TX-I/O
Power Supply or P1 BIM to other power supplies or Bus Connection Modules
using twisted pair cable in a chain configuration.
● When using NEC Class 2 wiring on a TX-I/O island bus extended from an
enclosure with a transformer, install a circuit interrupter to limit up to 4A maximum
where necessary. A 4A interrupted output is available on the PX Series Service
Boxes.
● TX-I/O island bus cables (24V~/ /CS/CD) must be run together either by NEC
Class 2 methods or, where not limited by local code, by NEC Class 1 power
limited methods.
TX-I/O Island Bus Power and Communication Options
WARNING
Equipment damage may occur if system neutral ( ) is not connected to building
approved earth ground at the transformer.