FX-PCX3731 Input/Output Module Installation Instructions
Part No. 24-10144-181, Rev. CFX-PCX3731-0
Issued December 5, 2014
Refer to the QuickLIT website for the most up-to-date version of this document.
Application
The FX-PCX3731 controller is a part of the Facility
Explorer FX-PC Series Programmable Controller family.
FX-PCX controllers expand the number of points
connected to an FX-PCA, FX-PCG, or FX-PCV
programmable controller or to an FX Supervisory
Controller.
FX-PCX controllers operate on an RS-485 BACnet®
Master-Slave/Token-Passing (MS/TP) Bus as BACnet
Application Specific Controllers (B-ASCs) and integrate
into the web-based Facility Explorer system.
Note: At FX-PCT Release 10.1, a new capability was
introduced allowing FX-PCVs, FX-PCGs, and
FX-PCAs to communicate by using either the
BACnet or the N2 field bus networking protocol.
The operation of the FX-PCX Input/Output Module
is not affected by the selection of the BACnet or
the N2 protocol in the host controller.
North American Emissions Compliance
Installation
Observe these guidelines when installing a controller:
• Transport the controller in the original container to
minimize vibration and shock damage.
• Verify that all parts shipped with the controller.
• Do not drop the controller or subject it to physical
shock.
Parts Included
• one controller with removable terminal blocks (Power,
SA, and FC bus are removable)
• one installation instructions sheet
Materials and Special Tools Needed
• three fasteners appropriate for the mounting surface
(M4 screws or #8 screws)
• one 20 cm (8 in.) or longer piece of 35 mm DIN rail
and appropriate hardware for DIN rail mount (only)
• small straight-blade screwdriver for securing wires in
the terminal blocks
Canada
This Class (A) digital apparatus meets all the
requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de la Classe (A) respecte toutes
les exigences du Règlement sur le matériel brouilleur
du Canada.
United States
This equipment has been tested and found to comply with the
limits for a Class A digital device pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when this equipment
is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential
area may cause harmful interference, in which case the users
will be required to correct the interference at their own expense.
Mounting
Observe these guidelines when mounting an FX-PCX
controller:
• Ensure the mounting surface can support the
controller, DIN rail, and any user-supplied enclosure.
• Mount the controller horizontally on 35 mm DIN rail
whenever possible.
• Mount the controller in the proper mounting position
(Figure 1).
• Mount the controller on a hard, even surface
whenever possible in wall-mount applications.
• Use shims or washers to mount the controller securely
and evenly on the mounting surface.
• Mount the controller in an area free of corrosive
vapors and observe the Ambient Conditions
requirements in Table 9.
• Provide for sufficient space around the controller for
cable and wire connections for easy cover removal
and good ventilation through the controller (50 mm
[2 in.] minimum on the top, bottom, and front of the
controller).
1FX-PCX3731 Input/Output Module Installation Instructions
• Do not mount the controller on surfaces prone to
vibration, such as duct work.
• Do not mount the controller in areas where
electromagnetic emissions from other devices or
wiring can interfere with controller communication.
To remove the controller from the DIN rail, pull the
bottom mounting clip out to the extended position and
carefully lift the controller off the DIN rail.
Observe these additional guidelines when mounting a
controller in a panel or enclosure:
• Mount the controller so that the enclosure walls do
not obstruct cover removal or ventilation through the
controller.
• Mount the controller so that the power transformer
and other devices do not radiate excessive heat to
the controller.
• Do not install the controller in an airtight enclosure.
Figure 1: Controller Mounting Positions
Wall Mount Applications
To mount an FX-PCX controller directly on a wall or other
flat vertical surface:
1. Pull the two bottom mounting clips outward and
ensure they are locked in the extended position as
shown in Figure 2.
2. Mark the three mounting hole locations on the wall
using the dimensions in Figure 2 and one of the mount
positions shown in Figure 1. Or, hold the controller
up to the wall or surface in a proper mount position
and mark the hole locations through the mounting
clips.
3. Drill holes in the wall or surface and insert appropriate
wall anchors in all of the mounting holes (if
necessary).
4. Hold the controller in place, and insert the screws
through the mounting clips and into the holes (or
anchors). Carefully tighten all of the screws.
Important: Do not overtighten the mounting screws.
Overtightening the screws may damage
the mounting clips.
Figure 2: Back of Controller Showing Extended
Mounting Clips, DIN Rail Channel, and Mounting
Dimensions, mm (in.)
DIN Rail Mount Applications
Mounting the controller horizontal on 35 mm DIN rail is
the preferred mounting method.
To mount an FX-PCX controller on 35 mm DIN rail:
1. Securely mount a 20 cm (8 in.) or longer section of
35 mm DIN rail horizontal and centered in the desired
space so that the controller mounts in the horizontal
position shown in Figure 1.
2. Pull the bottom mounting clips outward from the
controller to the extended position as shown in Figure
2.
3. Hang the controller on the DIN rail by the hooks at
the top of the (DIN rail) channel on the back of the
controller (Figure 2), and position the controller snugly
against the DIN rail.
4. Push the bottom mounting clip inward (up) to secure
the controller on the DIN rail.
2FX-PCX3731 Input/Output Module Installation Instructions
Figure 3: FX-PCX3731 Physical Features
Table 1: FX-PCX3731 Physical Features Callouts and Descriptions
Physical Feature: Description and ReferencesCallout
1
3
4
5
6
7
8
9
Binary Outputs (BOs) Terminal Block (See Table 3)
Mounting Clip (Three Total)2
Device Address DIP Switch Block (See Setting the Device Addresses)
24 VAC, Class 2 Supply Power Terminal Block (See Supply Power Terminal Block)
Cover Lift Tab (One of Two) (See Removing the Controller Cover)
Sensor Actuator (SA) Bus or Field Controller (FC) Bus Terminal Block (See SA/FC Bus Terminal Block)
Binary Inputs (BIs) Terminal Block (See Table 3)
LED Status Indicators (See Table 7)
Sensor Actuator (SA) Bus or Field Controller (FC) Bus Port (RJ-12 6-pin Modular Jack) (See SA/FC Bus Port)
3FX-PCX3731 Input/Output Module Installation Instructions
Wiring
Risk of Electric Shock: Disconnect or isolate all power
supplies before making electrical connections. More than
one disconnect or isolation may be required to
completely de-energize equipment. Contact with
components carrying hazardous voltage can cause
electric shock and may result in severe personal injury
or death.
Avertissement: Risque de décharge électrique:
Débrancher ou isoler toute alimentation avant de réaliser
un branchement électrique. Plusieurs isolations et
débranchements sont peut-être nécessaires pour
-couper entièrement l'alimentation de l'équipement. Tout
contact avec des composants conducteurs de tensions
dangereuses risque d'entraîner une décharge électrique
et de provoquer des blessures graves, voire mortelles.
Risk of Property Damage: Do not apply power to the
system before checking all wiring connections. Short
circuited or improperly connected wires may result in
permanent damage to the equipment.
Terminal Blocks and Bus Ports
See Figure 3 for terminal block and bus port locations on
the FX-PCX controller. Observe the following guidelines
when wiring an FX-PCX controller.
Input and Output Terminal Blocks
All of the input terminal blocks are mounted on the bottom
of the controller and the output terminal blocks are
mounted on the top of the controller. See Table 3 for more
information about I/O terminal functions, requirements,
and ratings.
SA/FC Bus Terminal Block
An FX-PCX can be connected to a Sensor/Actuator (SA)
bus or a Field Controller (FC) bus, but not to both buses
simultaneously. The SA/FC bus terminal block is a
removable, 4-terminal plug that fits into a board-mounted
jack.
When connecting the FX-PCX to an FC bus, wire the bus
terminal block plugs on the controller, and the other
controllers in a daisy-chain configuration using 3-wire
twisted, shielded cable as shown in Figure 4. See Table
5 for more information.
Figure 4: FC Bus Terminal Block Wiring
Mise En Garde: Risque de dégâts matériels: Ne pas
mettre le système sous tension avant d'avoir vérifié tous
les raccords de câblage. Des fils formant un court-circuit
ou connectés de façon incorrecte risquent
d'endommager irrémédiablement l'équipement.
Important: Do not exceed the controller electrical
ratings. Exceeding controller electrical
ratings can result in permanent damage to
the controller and void any warranty.
Important: Use copper conductors only. Make all wiring
in accordance with local, national, and
regional regulations.
Important: Electrostatic discharge can damage
controller components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the controller.
For detailed information on configuring and wiring an
MS/TP Bus, FC bus, and SA bus, refer to the FX-PC
Series Controllers MS/TP Communications Bus Technical
Bulletin (LIT-12011670).
When connecting the FX-PCX to an SA bus, wire the bus
terminal block plugs on the controller and other SA bus
devices in a daisy-chain configuration using 4-wire
twisted, shielded cable as shown in Figure 5. See Table
3 for more information.
4FX-PCX3731 Input/Output Module Installation Instructions
Figure 5: SA Bus Terminal Block Wiring
Note: The SA PWR/SHLD terminal does not supply 15
VDC. The SA PWR/SHLD terminal is isolated and
can be used to connect (daisy chain) the 15 VDC
power leads on the SA bus (Figure 5) or the cable
shields on the FC bus (Figure 4). The SA bus
supervisor supplies 15 VDC to devices on the SA
bus requiring power.
SA/FC Bus Port
The SA/FC bus port on the front of the controller is an
RJ-12, 6-position modular jack that provides a connection
for devices on the SA bus, a Bluetooth® Commissioning
Converter, ZigBee™wireless dongle, or an FX-ZFR1811
Wireless Router (depending on which bus the controller
is operating on).
Figure 6: Pin Number Assignments for Sensor, SA
Bus and FC Bus Ports on Controllers
Supply Power Terminal Block
The 24 VAC supply power terminal block is a gray,
removable, 3-terminal plug that fits into a board-mounted
jack on the top right of the controller.
Wire the 24 VAC supply power wires from the transformer
to the HOT and COM terminals on the terminal plug as
shown in Figure 7. The middle terminal on the supply
power terminal block is not used. See Table 5 for more
information about the supply terminal block.
Figure 7: 24 VAC Supply Power Terminal Block Wiring
The SA/FC bus port is connected internally to the SA/FC
bus terminal block. See Table 5 for more information.
The SA/FC bus port pin assignment is shown in Figure
6.
Note: The supply power wire colors may be different on
transformers from other manufacturers. Refer to
the transformer manufacturer’s instructions and
the project installation drawings for wiring details.
5FX-PCX3731 Input/Output Module Installation Instructions
To configure a controller for use with the FX-ZFR Series
Important: Connect 24 VAC supply power to the
controller and all other network devices so
that transformer phasing is uniform across
the network devices. Powering network
devices with uniform 24 VAC supply power
phasing reduces noise, interference, and
ground loop problems. The controller does
not require an earth ground connection.
Wireless Network Applications
The controller can also be installed in a wireless
application using an FX-ZFR1811 Wireless Field Bus
Router.
Wireless Field Bus system:
Note: FX-PCXs can talk wirelessly on the FC bus only.
1. Connect the FX-ZFR1811 Wireless Field Bus Router
to the FC bus port (RJ-12 modular jack) on the front
of the controller.
2. Ensure that the controller's device address DIP
switches are set to the correct device address. See
Setting the Device Addresses.
3. Set DIP switch 128 to ON, which enables wireless
operation on the controller.
For more information on installing a controller in a
wireless configuration, refer to the FX-ZFR Wireless
Field Bus Router Installation Instructions (Part No.
24-10325-29).
Termination Details
A set of Johnson Controls® termination diagrams provides details for wiring inputs and outputs to the controllers.
See the figures in this section for the applicable termination diagrams.
Table 2: Termination Details
Termination DiagramsType of Input/OutputType of Field Device
BIDry Contact (Binary
Input)
Actuator (Switch Low,
Externally Sourced)
(Switch Low, Externally
Sourced)
BOIncremental Control to
BO24 VAC Binary Output
6FX-PCX3731 Input/Output Module Installation Instructions
Table 2: Termination Details
BO24 VAC Binary Output
(Switch High, Externally
Sourced)
BOIncremental Control to
Actuator (Switch High,
Externally Sourced)
Termination DiagramsType of Input/OutputType of Field Device
Terminal Wiring Guidelines, Functions, Ratings, and Requirements
Input and Output Wiring Guidelines
Table 3 provides information and guidelines about the
functions, ratings, and requirements for the controller
input and output terminals; and references guidelines for
determining proper wire sizes and cable lengths.
In addition to the wiring guidelines in Table 3, observe
these guidelines when wiring controller inputs and
outputs:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All input and output cables, regardless of wire size or
number of wires, should consist of stranded, insulated,
and twisted copper wires.
• Shielded cable is not required for input or output
cables.
• Shielded cable is recommended for input and output
cables that are exposed to high electromagnetic or
radio frequency noise.
• Inputs/outputs with cables less than 30 m (100 ft)
typically do not require an offset in the software setup.
Cable runs over 30 m (100 ft) may require an offset
in the input/output software setup.
7FX-PCX3731 Input/Output Module Installation Instructions
Table 3: FX-PCX3731 Terminal Blocks, Functions, Ratings, Requirements, and Cables
Terminal Block
Label
BINARY INPUT
BINARY
OUPUT(External
Power Source Only)
BINARY
OUPUT(Internal
Power Source Only)
Label
IN n
ICOM n
OUTn
OCOMn
OUTn
OCOMn
Function, Ratings, RequirementsTerminal
Binary Input - Dry Contact Maintained Mode
0.01 second minimum pulse width Internal 18 V, 3k ohm
pull up
Binary Input - Pulse Counter/Accumulator Mode
0.01 second minimum pulse width
(50 Hz at 50% duty cycle)
Internal 18 V, 3k ohm pull up
Binary Input Common for all Binary Input (IN) terminals
Note: All Binary ICOMn terminals share a common, which
is isolated from all other commons, except the
Configurable Output (CO) common (OCOMn) when
the CO is defined as an Analog Output.
Binary Output - 24 VAC Triac (External Power)
Connects OUTn to OCOMn when activated.
External Power Source Requirements:
30 VAC maximum output voltage
0.5 A maximum output current
1.3 A at 25% duty cycle
40 mA minimum load current
Binary Output Common (for OUTn terminal)
Note: Each Binary Output common terminal (OCOMn) is
isolated from all other commons, including other
Binary Output commons.
Binary Output - 24 VAC Triac (Internal Power)
Sources internal 24 VAC power (24~ HOT)
Binary Output - 24 VAC Triac (Internal Power)
Connects OCOMn to 24~ COM when activated.
Internal Power Source:
30 VAC maximum voltage to load
0.5 A maximum output current
1.3 A at 25% duty cycle
40 mA minimum load current
Determine Wire Size and
Maximum Cable Length
See Guideline A in Table 4
See Guideline C in Table 4
See Guideline C in Table 4
1
1
See Table 4 to determine wire size and cable lengths for cables.
Cable and Wire Length Guidelines
Table 4 defines cable length guidelines for the various
wire sizes that may be used for wiring low-voltage (<30V)
input and outputs.
8FX-PCX3731 Input/Output Module Installation Instructions
Table 4: Cable Length Guidelines for Recommended Wire Sizes for Low-Voltage (<30V) Inputs and Outputs
Wire Size/Gauge and TypeGuideline
AssumptionsMaximum Cable
Length and Type
A
B
C
1.5 mm2(18 AWG) stranded copper
1.5 mm2(18 AWG) stranded copper
See Figure 8 to select wire size/gauge.
Use stranded copper wire
457 m (1,500 ft) twisted
wire
297 m (975 ft) twisted wire0.8 mm (20 AWG) stranded copper
183 m (600 ft) twisted wire0.6 mm (22 AWG) stranded copper
107 m (350 ft) twisted wireN/A (24 AWG) stranded copper
229 m (750 ft) twisted wire
137 m (450 ft) twisted wire0.8 mm (20 AWG) stranded copper
91 m (300 ft) twisted wire0.6 mm (22 AWG) stranded copper
61 m (200 ft) twisted wireN/A (24 AWG) stranded copper
See Figure 8 to determine
cable length. Use twisted
wire cable.
100 mV maximum voltage drop
Depending on cable and the connected input
or output device, you may have to define an
offset in the setup software for the input or
output point.
100 mV maximum voltage drop
Depending on cable and the connected input
or output device, you may have to define an
offset in the setup software for the input or
output point.
N/A
9FX-PCX3731 Input/Output Module Installation Instructions
Maximum Cable Length versus Load Current
Figure 8: Maximum Wire Length for Low-Voltage (<30V) Inputs and Outputs by Current and Wire Size
Use Figure 8 to estimate the maximum cable length
relative to the wire size and the load current (in mA) when
wiring inputs and outputs.
Note: Figure 8 applies to low-voltage (<30V) inputs and
outputs only.
SA/FC Bus and Supply Power Wiring Guidelines
Table 5 provides information about the functions, ratings,
and requirements for the controller communication bus
and supply power terminals; and guidelines for wire sizes,
cable types, and cable lengths when wiring the controller
communication buses and supply power.
In addition to the guidelines in Table 5, observe these
guidelines when wiring an SA or FC bus and the 24 VAC
supply power:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All SA and FC bus cables, regardless of wire size,
should be twisted, insulated, stranded copper wire.
• Shielded cable is strongly recommended for all SA
and FC bus cables.
•
Refer to the FX-PC Series Controller MS/TP
Communication Bus Technical Bulletin
(LIT-12011670) for detailed information regarding
wire size and cable length requirements for the SA
and FC buses.
10FX-PCX3731 Input/Output Module Installation Instructions
Table 5: Communications Bus and Supply Power Terminal Blocks, Functions, Ratings, Requirements, and
Cables
Terminal
Block/Port Label
FCBUS
or
SABUS
SA/FC BUS
(Port)
2
2
2
Labels
-
COM
SHLD
or
SAPWR
HOT24~
COM
Function, Electrical Ratings/RequirementsTerminal
FC or SA Bus Communications+
Signal Reference (Common) for FC or SA Bus
communications
SHLD on FC Bus: Isolated terminal (optional shield drain
connection
SAP WR on SA Bus: 15 VDC power lead connection
RJ-12 6-Position Modular Connector provides:
FC or SA Bus Communications
FC or SA Bus Signal Reference and 15 VDC Common
Commissioning Converter or an FX-ZFR 1811 Wireless
Router
(Maximum total current draw for SA Bus is 240 mA.)
24 VAC Power Supply - Hot
Supplies 20-30 VAC (Nominal 24 VAC)
24 VAC Power Supply - Common
(Isolated from all other Common terminals on controller.)
Recommended Cable Type
FC Bus: 0.6 mm (22 AWG)
stranded, 3-wire twisted, shielded
cable recommended.
SA Bus: 0.6 mm (22 AWG)
stranded, 4-wire (2 twisted-pairs),
shielded cable recommended.
Note: On the SA Bus, the + and -
wire are one twisted pair,
and the COM and SA PWR
are the second twisted pair
of wires.
Bluetooth Commissioning Converter
retractable cable or 24 AWG 3-pair
CAT 3 Cable <30.5 m (100 ft)
0.8 mm to 1.5 mm
(18 AWG) 2-wire
2
1
1
See Table 4 to determine wire size and cable lengths for cables.
2 The SA Bus and FC Bus wiring recommendations in this table are for MS/TP bus communications at 38,400 baud. For more
information, refer to the FX-PC Series Controller MS/TP Communications Bus Technical Bulletin (LIT-12011670).
Setup and Adjustments
Figure 9: Device Address DIP Switch Block Set to
Address 21
Setting the Device Addresses
FX-PCX controllers are master devices on MS/TP (SA
or FC) buses. Before operating controllers on a bus, you
must set a valid and unique device address for each
controller on the bus. You set a controller's device
address by setting the positions of the switches on the
DIP switch block at the top of the controller (Figure 3).
Device addresses 4 through 127 are the valid addresses
for these controllers.
The DIP switch block has eight switches numbered 128,
64, 32, 16, 8, 4, 2, and 1. Switches 64 through 1 are
device address switches. Switch 128 is a mode switch
that enables a controller to operate on an FX-ZFR Series
Wireless Field Bus. Switch 128 must be set to off for all
hard-wired SA and FC bus applications. Set switch 128
to ON for wireless FC bus applications only.
Note: All FX-PC series devices ship with switch 128 ON
and the remaining address switches off rendering
the controllers wired slave devices, which do not
operate on MS/TP buses, but will not interfere
with bus operation. Set a valid and unique device
address on the controller before applying power
to the controller on the bus.
To set the device addresses on FX-PCX controllers:
11FX-PCX3731 Input/Output Module Installation Instructions
1. Set all of the switches on the address DIP switch
block (128 through 1) to off.
2. Set one or more of the seven address switches (64
though 1) to ON, so that the sum of the switch
numbers set to ON equals the intended device
address. See Table 6 for valid device addresses.
Set the highest number switch that is less than or
equal to the intended device address to ON. Then
continue setting lower numbered switches until the
total equals the intended address. For example, if the
intended device address is 21, set switch 16 to ON
first, then set switch 4 ON, followed by switch 1
(16+4+1= 21).
3. Set switch 128 to ON only for controllers on an
FX-ZFR Series Wireless Field Bus application. For
all hard-wired SA and FC bus applications, ensure
that switch 128 is set to off.
Note: Do not connect a controller with switch 128
set to ON to an active (hard-wired) SA or FC
bus. When a controller with switch 128 set to
ON and a device address from 4 to 127 is
connected to a wired field bus, the entire field
bus is rendered inoperable until the controller
is disconnected or switch 128 is set to off.
Refer to the FX-ZFR Series Wireless Bus System
Technical Bulletin (LIT-12011660) for more
information on device addresses in wireless
applications.
4. Set a unique and sequential device address for each
of the controllers connected on the SA or FC bus
starting with device address 4.
Table 6: SA/FC Bus Device Address Descriptions
Use on DescriptionDevice
Address
0
(Switch
128 Off)
1 to 3
(Switch
128 Off)
4 to 127
(Switch
128 Off)
0 to 3
(Switch
128 ON)
4 to 127
(Switch
128 ON)
Reserved for FC Bus Supervisory Controller
(not for use on controllers).
Reserved for peripheral devices (not for use
on controllers).
Used for MS/TP master devices (controllers)
that are hardwired to an SA Bus or FC Bus.
Reserved addresses for wired slave devices
(not for use on controllers).
Note: FX-PCX controllers ship with switch
128 ON and the remaining address
switches off rendering the controllers
wired slave devices, which do not
operate on MS/TP buses.
Valid for MS/TP Master controllers on wireless
FC Buses only.
Note: Do not connect a controller with
switch 128 ON to an active
(hard-wired) SA or FC bus. When a
controller with switch 128 ON and a
device address from 4 to 127 is
connected to a wired field bus, the
entire field bus is rendered inoperable
until the controller is disconnected or
switch 128 is set to off.
To ensure the best bus performance, set sequential
device addresses with no gaps in the device address
range (4, 5, 6, 7, 8, 9, and so on). The controllers do
not need to be physically connected on the bus in
their numerical device address order.
5. Write each controller's device address on the white
label below the DIP switch block on the controller's
cover.
Refer to the FX-PC Series Controllers MS/TP
Communications Bus Technical Bulletin
(LIT-12011670) for more information on controller
device addresses and how to set them on MS/TP
buses.
Removing the Controller Cover
Important: Electrostatic discharge can damage
controller components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the controller.
Important: Disconnect all the power sources to the
controller before removing cover and
changing the position of any jumper or the
EOL switch on the controller. Failure to
disconnect power before changing a jumper
or EOL switch position can result in damage
to the controller and void any warranties.
The controller cover is held in place by four plastic latches
that extend from the base and snap into slots on the
inside of the housing cover.
To remove the controller cover:
12FX-PCX3731 Input/Output Module Installation Instructions
1. Place your fingernails under the two cover lift tabs
(Figure 3) on the sides of the housing cover and
gently pry the top of the cover away from the base to
release the cover from the two upper latches.
2. Pivot the top of the cover further to release it from the
lower two latches.
3. Replace the cover by placing it squarely over the
base, and then gently and evenly push the cover on
to the latches until they snap into the latched position.
Figure 10: FX-PCX3731 with Cover Removed Showing
EOL Switch Location
The BO source power selection jumpers determine
whether a BO provides internal power (sourced from the
controller) to the output load (INT position) or requires
an external power source (EXT position) for the output
load. Figure 11 shows an example of a controller BOs
and the associated power selection jumpers to the right
of the BOs terminal block.
Figure 11: Example Binary Outputs and the
Associated Source Power Jumper Positions
Binary Output (BO) Source Power Selection Jumpers
Risk of Electric Shock: Disconnect supply power to
the controller before attempting to adjust the Binary
Output Source Power Selection Jumpers. Failure to
disconnect the supply power may result in electric shock.
Mise En Garde: Risque de décharge électrique:
Débrancher l'alimentation de l'controller avant tout
réglage du Binary Output Source Power Selection
Jumpers. Le non-respect de cette précaution risque de
provoquer une décharge électrique.
Important: Do not connect an external power source
to a BO when the BO power source jumper
is in the internal power (INT) position.
Connecting external power to a BO that
sources internal power can damage the
controller and void any warranties.
Setting the End-of-Line (EOL) Switch
Each controller has an EOL switch, which, when set to
ON, sets the controller as a terminating device on the
bus. See Figure 10 for the EOL switch location. The
default EOL switch position is Off.
Figure 12: End-of-Line Switch Positions
To set the EOL switch on a controller:
1. Determine the physical location of the controller on
the SA or FC bus.
2. Determine if the controller must be set as a
terminating device on the bus.
13FX-PCX3731 Input/Output Module Installation Instructions
Note: The EOL termination rules for SA buses and
FC buses are different. Refer to the FX-PC
Series Controllers MS/TP Communications
Bus Technical Bulletin (LIT-12011670) for
detailed information regarding EOL termination
rules and EOL switch settings on SA and FC
buses.
3. If the controller is a terminating device on the FC bus,
set the EOL switch to ON. If the controller is not a
terminating device on the bus, set the EOL switch to
Off.
When a controller is connected to power with its EOL
switch set to ON, the amber EOL LED on the
controller cover is lit.
Table 7: Status LEDs and Descriptions of LED States
LED ColorLED Label
Description of LED StatesNormal LED
State
On SteadyGreenPOWER
Off SteadyRedFAULT
Blink - 2 HzGreenSA/FC BUS
AmberEOL
Off (Except on
terminating
devices)
Off Steady = No Supply Power or the controller’s polyswitch/resettable fuse
is open. Check Output wiring for short circuits and cycle power to controller.
On Steady = Power Connected
Off Steady = No Faults
On Steady = Device Fault; no application loaded; Main Code download
required, if controller is in Boot mode, or a firmware mismatch exists between
the controller and the FX-ZFR1811 Wireless Field Bus Router.
Blink - 2 Hz = Download or Startup in progress, not ready for normal operation
Blink - 2 Hz = Data Transmission (normal communication)
Off Steady = No Data Transmission (N/A - auto baud not supported)
On Steady = Communication lost, waiting to join communication ring
On Steady = EOL switch in ON position
Off Steady = EOL switch in Off position
Commissioning the Controllers
You commission controllers with the FX-PCT software,
either via a Bluetooth Commissioning Converter, a
ZigBee™ wireless dongle, or in BACnet® router mode
when connected to an FX Supervisory Controller. Refer
to the Controller Tool Help (LIT-12011147) for detailed
information on commissioning controllers.
Troubleshooting the Controllers
Observe the Status LEDs on the front of the controller
and see Table 7 to troubleshoot the controller.
Repair Information
If a controller fails to operate within its specifications,
replace the controller. For a replacement controller,
contact your Johnson Controls® representative.
Table 8: Accessories Ordering Information
DescriptionProduct Code Number
Bluetooth Commissioning ConverterFX-BTCVT-1
Local Controller DisplayFX-DIS1710-0
Wireless Field Bus RouterFX-ZFR1811-0
Transformer, 120 VAC Primary to 24 VAC secondary, 20 VA, Wall PlugTP-2420
Y65T31-0
Transformer, 120/208/240 VAC Primary to 24 VAC Secondary, 40 VA, Foot Mount, 8 in. Primary
Leads and Secondary Screw Terminals, Class 2
Note: Additional Y6x-x Series transformers are also available. Refer to the Series Y63, Y64, Y65,
Y66, and Y69 Transformers Product Bulletin (LIT-125755) for more information.
Accessories
See Table 8 for controller accessories ordering
information.
14FX-PCX3731 Input/Output Module Installation Instructions
Table 8: Accessories Ordering Information
DescriptionProduct Code Number
Power transformer (Class 2, 24 VAC, 50 VA maximum output), no enclosureAS-XFR050-0
Replacement SA Bus Terminal Blocks, 4-Position, Brown, Bulk PackAP-TBK4SA-0
Replacement FC Bus Terminal Blocks, 4-Position, Blue, Bulk PackAP-TBK4FC-0
Replacement Power Terminal Blocks, 3-Position, Gray, Bulk PackAP-TBK3PW-0
ZFR-USBHA-0
USB Dongle with ZigBee™ Driver provides a wireless connection through FX-PCT to allow wireless
commissioning of the wirelessly enabled FX-PCG, FX-PCA, FX-PCX, and FX-PCV field controllers.
Also allows use of the FX-ZFR Checkout Tool (FX-ZCT) in FX-PCT.
Note: The ZFR-USBHA-0 replaces the IA OEM DAUBI_2400 ZigBee USB dongle. For additional
information on the ZFR-USBHA-0 ZigBee dongle, refer to the FX-ZFR Series Wireless Field
Bus System Technical Bulletin (LIT-12011660) or FX-ZFR Series Wireless Field Bus System
Quick Reference Guide (LIT-12011696).
Technical Specifications
Table 9: FX-PCX3731 Technical Specifications
FX-PCX3731 Expansion Input/Output ModuleProduct Code Number
Supply Voltage
Ambient Conditions
Addressing
Communications Bus
Input and Output Capabilities
Terminations
Mounting
Housing
Dimensions(Height x Width x Depth)
24 VAC (nominal, 20 VAC minimum/30 VAC maximum), 50/60 Hz, power supply
Class 2 (North America), Safety Extra-Low Voltage (SELV) (Europe)
14 VA maximum for FX-PCX3731-0A onlyPower Consumption
Operating: 0 to 50°C (32 to 122°F); 10 to 90% RH noncondensing
Storage: -40 to 80°C (-40 to 176°F); 5 to 95% RH noncondensing
DIP switch set; valid controller device addresses 4–127 (Device addresses 0–3 and
128–255 are reserved and not valid addresses.)
BACnet® MS/TP, RS-485:
3-wire FC bus between the supervisory controller and other controllers
4-wire SA bus between controller, network sensors and other sensor/actuator devices,
includes a lead to source 15 VDC supply power (from controller) to bus devices.
H8SX/166xR Renesas® 32-bit microcontrollerProcessor
640 KB Flash Memory and 128 KB Random Access Memory (RAM)Memory
8 - Binary Inputs: Defined as Dry Contact Maintained or Pulse Counter/Accumulator
Mode
8 - Binary Outputs: Defined as 24 VAC Triac (external source power only)
Input/Output: Fixed Screw Terminal Blocks
SA/FC Bus and Supply Power: 4-Wire and 3-Wire Pluggable Screw Terminal
Blocks
SA/FC Bus Port: RJ-12 6-Pin Modular Jacks
Horizontal on single 35 mm DIN rail mount (preferred), or screw mount on flat surface
with three integral mounting clips on controller
Enclosure material: ABS and polycarbonate UL94 5VB; Self-extinguishing, Plenum
Rated
Protection Class: IP20 (IEC529)
150 x 164 x 53 mm (5-7/8 x 6-1/2 x 2-1/8 in.) including terminals and mounting clips
Note: Mounting space requires an additional 50 mm (2 in.) space on top, bottom
and front face of controller for easy cover removal, ventilation and wire
terminations.
0.5 kg (1.1 lb)Weight
15FX-PCX3731 Input/Output Module Installation Instructions
Table 9: FX-PCX3731 Technical Specifications
Compliance
United States: UL Listed, File E107041, CCN PAZX, UL 916, Energy Management
Equipment
FCC Compliant to CFR47, Part 15, Subpart B, Class A
Canada: UL Listed, File E107041, CCN PAZX7 CAN/CSA C22.2 No.205, Signal
Equipment
Industry Canada Compliant, ICES-003
Europe: Johnson Controls, Inc. declares that this product is in compliance with the
essential requirements and other relevant provisions of the EMC Directive
2004/108/EC.
Australia and New Zealand: C-Tick Mark, Australia/NZ Emissions Compliant
BACnet International: BACnet Testing Laboratories (BTL) Protocol Revision 4
Listed BACnet Application Specific Controller (B-ASC)
The performance specifications are nominal and conform to acceptable industry standard. For application at conditions
beyond these specifications, consult the local Johnson Controls® office. Johnson Controls, Inc. shall not be liable
for damages resulting from misapplication or misuse of its products.
507 E. Michigan Street, Milwaukee, WI 53202
Metasys® and Johnson Controls® are registered trademarks of Johnson Controls, Inc.
All other marks herein are the marks of their respective owners.© 2014 Johnson Controls, Inc.
Building Efficiency
www.johnsoncontrols.comPublished in U.S.A.
16FX-PCX3731 Input/Output Module Installation Instructions
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