Johnson Controls FT-04A Quick Start Manual page 5

Callout Description
5 COM terminal
6 22 AWG copper stranded twisted wire up to
100 m (328 ft) in length
7 COM terminal
8 OUT terminal
Figure 11: Universal input resistance mode
Callout Description
1 22 AWG copper stranded twisted wire up to
100 m (328 ft) in length
2 Controller
3 UI terminal
4 COM terminal
Figure 12: Universal input digital dry contact input
Callout Description
1 Field device
2 22 AWG copper stranded twisted wire up to
100 m (328 ft) in length
3 Controller
4 UI terminal
5 COM terminal
6 Dry contact
Normally open (NO) or normally closed (NC)
as required
Power supply terminal wiring
Connect the 24 VAC supply power wires from the
transformer to the HOT and COM power terminals as
shown in Figure 13.
Note: The supply power wire colors may differ on
transformers from other manufacturers. Refer to
the transformer manufacturer's instructions and the
project installation drawings for wiring details.
Important: To reduce noise, interference, and
ground loop problems, connect a 24 VAC supply
power to the controller and to all other network
devices so that transformer phasing is uniform
across network devices. The controller does not
require an earth ground connection. However, when
you need to ground the secondary of the 24 VAC
transformer, make only one ground connection
near the transformer. For more information, see the
following figure.
Figure 13: Transformer grounding
To avoid property damage, check all wiring
connections before you apply power to the system.
If you wire this terminal incorrectly, a short circuit
can occur across the 24 VAC power supply on the
controller. A short circuit can cause a tripped circuit
breaker or a blown fuse. If you use a transformer
with a built-in fuse, you may need to replace the
transformer.
Controller interfacing
To interface with a controller and its inputs and outputs
with Controller Programming Tools (CPT) and the
controller's web server, establish a connection from your
device.
Note: Use the following procedures to set up
a controller on a primary network. For more
information about a secondary network setup, refer
to the product's User Reference Guide.
Connecting to a controller with Wi-Fi
1. On the desktop toolbar on your computer, click
your Wi-Fi network icon.
2. Find the controller's SSID, then connect to the
controller.
CAUTION
FT-04A Quick Start Guide 5