User Manual

Document No. 553-141
Installation Instructions
April 30, 2020
Page 2 of 4 Siemens Industry, Inc.
Prerequisites
CAUTION
No power wiring is connected to the field
panel controller or other TX-I/O
components at this time.
CAUTION
The TX-I/O island bus must be mounted on
a DIN rail (1.38" × 0.3" × 0.04" (35 mm ×
7.5 mm × 1 mm)).
● For energy management installations, NEMA Type
1 or better enclosure with DIN rails and source of
24 Vac.
● For smoke control installations, PX series
enclosures and service boxes.
● TX-I/O™ Power Supply, Bus Connection Module
or Bus Interface Devices.
● If mounting in an enclosure:
– Enclosure is installed, DIN rail included.
– The power source is installed, as applicable.
– The power is OFF.
● All necessary wiring is pulled and terminated per
the layout drawing.
● Power and communication wiring is terminated to
the removable plugs supplied with the devices.
● The plug-in I/O modules are either removed from
or parked in the terminal bases.
Power Requirements
One of the following power sources is pulled to the
enclosure:
● 120 Vac, 60 Hz and terminated at the 115V PX
Series Service Box.
● 230 Vac, 50/60 Hz and terminated at the 230V PX
Series Service Box.
● 24 Vac, 50/60 Hz Class 1 power limited from a
third-party transformer and connected to a terminal
block.
● If powering a TX-I/O expansion panel, power wiring
is run from the transformer in the primary panel to
the expansion panel, if needed.
CAUTION
For information on extending the TX-I/O
island bus outside the enclosure, see the
Wiring Guidelines .
NOTE:
Depending on the module types and point
configurations used, one service box
transformer may have insufficient power for
more than two TX-I/O Power Supplies. More
power may be required if using a Modular Series
with the maximum number of TX-I/O modules.
General Installation Requirements
CAUTION
All devices not isolated by an Island Bus
Expansion module (TXA1.IBE) must be
connected to the same grounding point.
CAUTION
TX-I/O components require a system
neutral with single point earth ground. Do
not connect these components to a floating
system neutral.
I/O Module Insertion Required for Proper
Grounding
All measuring/neutral terminals are connected in the
plug-in I/O module, not in the terminal base. When the
plug-in I/O module is removed, these terminals are not
connected.
WARNING
Install external supply line fusing in
series with relay contacts and
controlled device.
Fuse type and value should be the
lowest required by control relay
datasheet or controlled device
datasheet.
Failure to install fuse may result in
damage to relay or device.