Engineering Documentation

Chapter 3 – Field Panels
TX-I/O Product Range
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TX-I/O Island Bus
The TX-I/O island bus consists of the following signals:
● Communication and supply (CS)
● Communication data (CD)
● AC power (24V~)
● System neutral ( )
These signals operate over the self-forming TX-I/O module rails and are externally
available at TX-I/O Power Supply and Bus Connection Module connectors.
TX-I/O Island Bus Expansion
The TX-I/O island bus expansion consists of the following signals:
● Communication data (CD) over RS-485 (+)
● Communication data (CD) over RS-485 (–)
● Signal common over RS-485 ( )
These signals operate over RS-485 cable and are available at Island Bus Expansion
module connectors.
TX-I/O Module Support
Controllers that Support a TX-I/O Island Bus.
PXC Modular Series PXC Compact 36 P1 Bus Interface
Module (BIM)
Points Supported 500 32 80
TX-I/O Modules Supported
(Maximum)
64 4 10
Power Supplies Supported 4 4 3
TX-I/O Power Supply N/A
1
N/A
1
14.4 W
2
1)
Use a TX-I/O Power Supply to power TX-I/O modules. See Figure RS-485 ALN Trunk Shield
Connection [
➙
47].
2)
See Figure RS-485 FLN (P1) Trunk Shield Connection—Electronic Output [
➙
48].
● A maximum of 16 bus connections are permitted per island bus. For example, 1
P1 BIM + 3 TX-I/O Power Supply modules + 12 Bus Connection Modules = 16 bus
connection points.
Controllers that Support a TX-I/O Island Bus.
TC Modular Series TC Compact 36
Points Supported 500 32
TX-I/O Modules Supported (Maximum) 64 4
Power Supplies Supported 4 4
● A maximum of 16 bus connections are permitted per island bus. For example, 4
TX-I/O Power Supply modules + 12 Bus Connection Modules = 16 bus connection
points
● On a TX-I/O island bus, multiple power supplies may be used in parallel
(connected using CS/CD terminals), or up to two power supplies may be used in
series (self-forming bus rails).