Johnson Controls IOM3731 User manual

IOM3731 Input/Output Module Installation Guide
Application
The IOM3731 Input/Output Expansion Module (IOM) is
part of the Metasys® system Field Equipment Controller
family. IOM field controllers expand the number of I/
O points connected to a Network Automation Engine
(NAE), Network Control Engine (NCE), Field Equipment
Controller (FEC), or Advanced Application Field Equipment
Controller (FAC) to monitor and control a wide variety of
HVAC equipment.
IOM field controllers operate on an RS-485 BACnet® MS/
TP Bus and integrate into the web-based Metasys system.
Note: At CCT Release 10.1 and later, a new capability
was introduced allowing VMAs, FECs, and FACs to
communicate by using either the BACnet or the N2
field bus networking protocol. The operation of the
IOM Input/Output Module is not affected by the
selection of the BACnet or the N2 protocol in the host
controller, when the IOM is connected to the host
controller using the SA bus. Only the BACnet protocol
is supported when the IOM is connected directly to
the trunk using the FC bus.
North American Emissions Compliance
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.
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
and SA/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
Physical features
*2410143322J*
Part No. 24-10143-322 Rev. J
2019-10-18
(barcode for factory use only)
MS-IOM3731

Figure 1: IOM3731 physical features
Table 1: IOM3731 physical features callouts and
descriptions
Callo
ut Physical feature: description and references
1 Binary Outputs (BOs) Terminal Block (see Table 2)
2 Mounting Clip
3Device Address DIP Switch Block (see Setting the device
addresses)
424 VAC, Class 2 Supply Power Terminal Block (see Supply
power terminal block)
5 Cover Lift Tab (see Removing the Controller cover)
6Sensor Actuator (SA) Bus / Field Controller (FC) Bus
Terminal Block (see SA/FC bus terminal block)
7 Binary Inputs (BIs) Terminal Block (see Table 2)
8 LED Status Indicators
9Sensor Actuator (SA) Bus or Field Controller (FC) Bus Port
(RJ-12 6-pin Modular Jack) (see SA/FC bus port)
Mounting
Observe these guidelines when mounting a field
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 2).
• 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).
• 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.
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.
IOM3731 Input/Output Module Installation Guide2

Figure 2: Controller mounting positions
DIN rail mount applications
Mounting the controller horizontal on 35 mm DIN rail is
the preferred mounting method.
To mount a field 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 2.
2. Pull the bottom mounting clips outward from the
controller to the extended position as shown in
Figure 3.
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 3), 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.
To remove the controller from the DIN rail, pull the bot-
tom mounting clip out to the extended position and care-
fully lift the controller off the DIN rail.
Wall mount applications
To mount a field 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 3.
2. Mark the three mounting hole locations on the wall
using the dimensions in Figure 3 and one of the
mount positions shown in Figure 2. 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.
Mounting features and dimensions
Figure 3: Back of Controller showing extended
mounting clips, DIN rail channel, and mounting
dimensions, mm (in.)
Wiring
Warning
Risk of Electric Shock
Disconnect or isolate all power supplies before mak-
ing electrical connections. More than one disconnect
or isolation may be required to completely de-energize
equipment. Contact with components carrying haz-
ardous voltage can cause electric shock and may re-
sult in severe personal injury or death.
Avertissement
Risque de décharge électrique
Débrancher ou isoler toute alimentation avant de
réaliser un branchement électrique. Plusieurs iso-
lations et débranchements sont peut-être néces-
saires pour -couper entièrement l'alimentation de
l'équipement. Tout contact avec des composants con-
ducteurs de tensions dangereuses risque d'entraîner
une décharge électrique et de provoquer des
blessures graves, voire mortelles.
IOM3731 Input/Output Module Installation Guide 3

CAUTION
Risk of Personal Injury and Property Damage
Do not apply power to the system before checking all
wiring connections. Short circuited or improperly con-
nected wires may result in permanent damage to the
equipment.
ATTENTION
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 for-
mant un court-circuit ou connectés de façon incor-
recte 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 MS/TP
Communications Bus Technical Bulletin (LIT-12011034).
Terminal blocks and bus ports
See Figure 1 for terminal block and bus port locations
on the IOM controller. Observe the following guidelines
when wiring an IOM 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
2 for more information about I/O terminal functions,
requirements, and ratings.
SA/FC bus terminal block
An IOM can be connected to a SA bus or a 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 IOM 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 4
for more information.
Figure 4: FC bus terminal block wiring
When connecting the IOM 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.
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 (FAC,
FEC, or VMA) supplies 15 VDC to devices on the SA
bus requiring power.
IOM3731 Input/Output Module Installation Guide4

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®
Wireless Commissioning Converter, an ZFR/ZFR Pro
Wireless Router (depending on which bus the controller is
operating on).
The SA/FC bus port is connected internally to the SA/FC
bus terminal block. See Table 4 for more information. The
SA/FC bus port pin assignment is shown in Figure 6.
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 4 for more
information about the supply terminal block.
Figure 7: 24 VAC supply power terminal block wiring
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.
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 a ZFR/ZFR Pro Wireless Field Bus Router.
To configure a controller for use with the ZFR/ZFR Pro
Series Wireless Field Bus system:
Note: IOMs can communicate wirelessly on the FC
bus only.
1. Connect the ZFR/ZFR Pro 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.
Terminal Wiring Guidelines, Functions,
Ratings, and Requirements
Input and Output wiring guidelines
Table 2 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 2, 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.
IOM3731 Input/Output Module Installation Guide 5

I/O wiring ratings and requirements
Table 2: IOM3731 terminal blocks, functions, ratings, requirements, and cables
Terminal block label Terminal
label Function, ratings, requirements Determine wire size and maximum cable length
Binary Input - Dry Contact Maintained Mode
0.01 second minimum pulse width Internal 18 V, 3k ohm pull
up
INnBinary 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
ICOM n
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.
See Guideline A in Cable and wire
length guidelines.
OUTn
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
OUPUT(External Power
Source Only)
OCOMn
Binary Output Common (for OUTn terminal)
Note: Each Binary Output common terminal (OCOMn)
is isolated from all other commons, including other
Binary Output commons.
See Guideline C in Cable and wire
length guidelines.
OUTnBinary Output - 24 VAC Triac (Internal Power)
Sources internal 24 VAC power (24~ HOT)
BINARY
OUPUT(Internal Power
Source Only) OCOMn
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
See Guideline C in Cable and wire
length guidelines.
Note: See Cable and wire length guidelines to
determine wire size and cable lenghts for cables.
Cable and wire length guidelines
The following table defines cable length guidelines for the
various wire sizes that may be used for wiring low-voltage
(<30 V) input and outputs.
Table 3: Cable length guidelines for recommended wire sizes for low-voltage (<30 V) Inputs and Outputs
Guideline Wire size/Gauge and type Maximum cable length
and type Assumptions
1.0 mm (18 AWG) stranded copper 457 m (1,500 ft) twisted wire
0.8 mm (20 AWG) stranded copper 297 m (975 ft) twisted wire
0.6 mm (22 AWG) stranded copper 183 m (600 ft) twisted wire
A
0.5 mm (24 AWG) stranded copper 107 m (350 ft) twisted wire
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.
IOM3731 Input/Output Module Installation Guide6

Table 3: Cable length guidelines for recommended wire sizes for low-voltage (<30 V) Inputs and Outputs
Guideline Wire size/Gauge and type Maximum cable length
and type Assumptions
1.0 mm (18 AWG) stranded copper 229 m (750 ft) twisted wire
0.8 mm (20 AWG) stranded copper 137 m (450 ft) twisted wire
0.6 mm (22 AWG) stranded copper 91 m (300 ft) twisted wire
B
0.5mm (24 AWG) stranded copper 61 m (200 ft) twisted wire
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.
C
See Maximum cable length versus
load current to select wire size/gauge.
Use stranded copper wire
See Maximum cable length
versus load current to
determine cable length. Use
twisted wire cable.
N/A
Maximum cable length versus load current
Use the following image to estimate the maximum cable
length relative to the wire size and the load current (in
mA) when wiring inputs and outputs.
Note: The following applies to low-voltage (<30 V)
inputs and outputs only.
Figure 8: Maximum wire length for low-voltage (<30
V) Inputs and Outputs by current and wire size
SA/FC bus and supply power wiring
guidelines
Table 4 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 4, 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 MS/TP Communications Bus Technical
Bulletin (LIT-12011034) for detailed information
regarding wire size and cable length requirements for
the SA and FC buses.
IOM3731 Input/Output Module Installation Guide 7

Communications bus and power
supply terminal block rating and
requirements
Table 4: Communications bus and supply power terminal blocks, functions, ratings, requirements, and cables
Terminal block/Port
label Terminal labels Function, electrical ratings/Requirements Recommended cable type
+
-FC or SA Bus Communications
COM Signal Reference (Common) for FC or SA Bus
communications
FCBUS or SABUS
SHLD
or
SAPWR
SHLD on FC Bus: Isolated terminal (optional shield
drain connection
SAP WR on SA Bus: 15 VDC power lead connection
Note: The SA PWR terminal on an IOM
controller does not supply 15 VDC. The SA
Bus supervisor (FAC, FEC, or VMA) supplies
15 VDC to devices on the SA Bus requiring
power.
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.
SA/FC BUS
(Port)
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 ZFR /ZFR Pro Wireless
Router
(Maximum total current draw for SA Bus is 100
mA.)
Wireless Commissioning Converter
retractable cable or 24 AWG 3-pair
CAT 3 Cable <30.5 m (100 ft)
HOT 24 VAC Power Supply - Hot
Supplies 20-30 VAC (Nominal 24 VAC)
24~
COM
24 VAC Power Supply - Common
(Isolated from all other Common terminals on
controller.)
0.8 mm to 1.0 mm
(18 AWG) 2-wire
Note: 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 MS/TP Communications
Bus Technical Bulletin (LIT-12011034)
Commissioning the Controllers
You commission controllers with the CCT software, either
via a Bluetooth Wireless Commissioning Converter, a
ZigBee wireless dongle, or through MAP 4.2+/BACnet
Router (Mobile Access Portal (MAP) Gateway at version
4.2 or above), or in BACnet router mode when connected
to an NAE or NCE. 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
use the following table to troubleshoot the controller.
Table 5: Status LEDs and descriptions of LED states
LED label LED color Normal LED state Description of LED states
POWER Green On Steady
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
FAULT Red Off Steady
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 ZFR1811 Wireless Field Bus Router.
Blink - 2 Hz = Download or Startup in progress, not ready for normal operation
IOM3731 Input/Output Module Installation Guide8

Table 5: Status LEDs and descriptions of LED states
LED label LED color Normal LED state Description of LED states
SA/FC BUS Green Blink - 2 Hz
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
EOL Amber
Off (Except on
terminating
devices)
On Steady = EOL switch in ON position
Off Steady = EOL switch in Off position
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 6: Termination details
Type of field device Type of Input/Output Termination diagrams
Dry Contact (Binary Input) BI
Incremental Control to
Actuator (Switch Low,
Externally Sourced)
BO
24 VAC Binary Output
(Switch Low, Externally
Sourced)
BO
24 VAC Binary Output
(Switch High, Externally
Sourced)
BO
IOM3731 Input/Output Module Installation Guide 9

Table 6: Termination details
Type of field device Type of Input/Output Termination diagrams
Incremental Control to
Actuator (Switch High,
Externally Sourced)
BO
Setup and Adjustments
Setting the device addresses
Metasys field 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 1).
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 a ZFR/ZFR Pro 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.
Figure 9: Device address DIP switch block set to
address 21
Note: Metasys field controllers ship with switch
128 ON and the remaining address switches off
rendering the controllers wired subordinate 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 Metasys field
controllers:
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 7 for valid device addresses.
Set the highest number switch that is less than or equal
to the intended device address to ON. Then continue set-
ting 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 a ZFR/
ZFR Pro 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 WNC1800/ZFR182x Pro Series Wireless Field
Bus System Technical Bulletin (LIT-12012356) or the
ZFR1800 Series Wireless Field Bus System Technical Bulletin
(LIT-12011295) 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.
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 MS/TP Communications Bus Technical Bulletin
(LIT-12011034) for more information on controller device
addresses and how to set them on MS/TP buses.
IOM3731 Input/Output Module Installation Guide10

Table 7: SA/FC bus device address descriptions
Device
address Use on description
0
(Switch 128
Off)
Reserved for FC Bus Supervisory Controller (not for
use on controllers).
1 to 3
(Switch 128
Off)
Reserved for peripheral devices (not for use on
controllers).
4 to 127
(Switch 128
Off)
Used for MS/TP master devices (controllers) that
are hardwired to an SA Bus or FC Bus.
0 to 3
(Switch 128
ON)
Reserved addresses for wired subordinate devices
(not for use on controllers).
Note: Metasys field controllers ship with
switch 128 ON and the remaining address
switches off rendering the controllers wired
subordinate devices, which do not operate on
MS/TP buses.
4 to 127
(Switch 128
ON)
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.
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:
1. Place your fingernails under the two cover lift tabs
(Figure 1) 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.
EOL switch location
Figure 10: IOM3731 with cover removed showing EOL
switch location
Binary Output (BO) source power
selection jumpers
Warning
Risk of Electric Shock
Disconnect supply power to the controller before at-
tempting to adjust the Binary Output Source Power
Selection Jumpers. Failure to disconnect the supply
power may result in electric shock.
Avertissement
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.
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.
IOM3731 Input/Output Module Installation Guide 11

Figure 11: Example binary Outputs and the associated
source power jumper positions
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.
Note: The EOL termination rules for SA buses
and FC buses are different. Refer to the MS/TP
Communications Bus Technical Bulletin, (LIT-12011034)
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.
Repair information
If a controller fails to operate within its specifications,
replace the controller. For a replacement controller,
contact your Johnson Controls representative.
IOM3731 Input/Output Module Installation Guide12

Accessories
Table 8: Accessories ordering information
Product code number Description
MS-DIS1710-0 Local Controller Display
TP-2420 Transformer, 120 VAC Primary to 24 VAC secondary, 20 VA, Wall Plug
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.
AS-XFR050-0 Power transformer (Class 2, 24 VAC, 50 VA maximum output), no enclosure
AP-TBK4SA-0 Replacement SA Bus Terminal Blocks, 4-Position, Brown, Bulk Pack of 10
AP-TBK4FC-0 Replacement FC Bus Terminal Blocks, 4-Position, Blue, Bulk Pack of 10
AP-TBK3PW-0 Replacement Power Terminal Blocks, 3-Position, Gray, Bulk Pack of 10
WNC1800/ZFR182x Pro
Wireless field Bus System
This system is used for installations that support BACnet/IP but can also coexist with the ZFR1800 Series
when installed under the same supervisor (i.e., network engine). Refer to the WNC1800/ZFR182x Pro Series
Wireless Field Bus System Product Bulletin (LIT-12012320) for a list of available products.
ZFR1800 Series Wireless
Field Bus System
This system is used for installations that only support BACnet MS/TP. Refer to the ZFR1800 Series Wireless
Field Bus System Product Bulletin (LIT-12011336) for a list of available products.
NS Series Network
Sensors Refer to the NS Series Network Sensors Product Bulletin (LIT-12011574) for specific sensor model descriptions.
WRZ Series Wireless
Room Sensors
Refer to the WRZ Series Wireless Room Sensors Product Bulletin (LIT-12000653) for specific sensor model
descriptions.
Mobile Access Portal
(MAP)Gateway
Refer to the Mobile Access Portal Gateway Catalog Page (LIT-1900869) to identify the appropriate product for
your region.
Technical specifications
Table 9: IOM3731 technical specifications
Product Code Number MS-IOM3731-x Input/Output Module
Supply Voltage 24 VAC (nominal, 20 VAC minimum/30 VAC maximum), 50/60 Hz, power supply Class 2
(North America), Safety Extra-Low Voltage (SELV) (Europe)
Power Consumption 14 VA maximum for IOM3731-0A only
Ambient Conditions Operating: 0°C to 50°C (32°F to 122°F); 10% to 90% RH noncondensing
Storage: -40°C to 80°C (-40°F to 176°F); 5% to 95% RH noncondensing
Addressing DIP switch set; valid controller device addresses 4–127 (Device addresses 0–3 and 128–255
are reserved and not valid addresses.)
Communications Bus
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.
Processor H8SX/166xR Renesas® 32-bit microcontroller
Memory 640 KB Flash Memory and 128 KB Random Access Memory (RAM)
Input and Output Capabilities
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)
Terminations
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
Mounting Horizontal on single 35 mm DIN rail mount (preferred), or screw mount on flat surface
with three integral mounting clips on controller
Housing Enclosure material: ABS and polycarbonate UL94 5VB; Self-extinguishing, Plenum Rated
Protection Class: IP20 (IEC529)
IOM3731 Input/Output Module Installation Guide 13

Table 9: IOM3731 technical specifications
Dimensions(Height x Width x Depth)
150 mm x 164 mm x 53 mm (5-7/8 in. x 6-1/2 in. 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.
Weight 0.5 kg (1.1 lb)
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 declares that this product is in compliance with the essential
requirements and other relevant provisions of the EMC Directive.
Australia and New Zealand: RCM Mark, Australia/NZ Emissions Compliant
Compliance
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 shall not be liable for
damages resulting from misapplication or misuse of its
products.
Product warranty
This product is covered by a limited warranty, details
of which can be found at www.johnsoncontrols.com/
buildingswarranty.
Single point of contact
APAC Europe NA/SA
JOHNSON CONTROLS
C/O CONTROLS PRODUCT
MANAGEMENT
NO. 32 CHANGJIJANG RD NEW
DISTRICT
WUXI JIANGSU PROVINCE 214028
CHINA
JOHNSON CONTROLS
WESTENDHOF 3
45143 ESSEN
GERMANY
JOHNSON CONTROLS
507 E MICHIGAN ST
MILWAUKEE WI 53202
USA
For more contact information, refer to
www.johnsoncontrols.com/locations.
© 2019 Johnson Controls. All rights reserved. All specifications and other information shown were current as of document revision and
are subject to change without notice.
www.johnsoncontrols.com