Johnson Controls IOM3723 Manuale utente
IOM3723 Input/Output Module Installation Guide
Application
The MS-IOM3723 input/output expansion module
is a part of the Metasys system Field Equipment
Controller family. Input/Output expansion modules
(IOMs) expand the number of input/output points
connected to a General Purpose Application
Controller (CGM), VAV Box Controller (CVM), SNC,
SNE, Network Automation Engine (NAE), Network
Control Engine (NCE), Advanced Application Field
Equipment Controller (FAC), Field Equipment
Controller (FEC), or Variable Air Volume Modular
Assembly (VMA) to monitor and control a wide
variety of HVAC equipment.
Note: The IOM3723 model is only available
in certain regions. Contact your local Johnson
Controls representative for more information.
IOM expansion modules operate on an RS-485
BACnet® MS/TP Bus and integrate into Johnson
Controls® and third-party BACnet systems. IOMs
Note: With Release 10.1 of the Controller
Configuration Tool (CCT), VMAs, FECs, and
FACs can be configured to communicate using
either the BACnet MS/TP or the N2 field bus
networking protocol. The operation of the
IOM is not affected by the selection of the
BACnet MS/TP or the N2 protocol in the host
controller, when the IOM is connected to the
host controller using the SA bus.
North American emissions
compliance
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.
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.
Installation
Observe the following guidelines when installing an
expansion module:
• To minimize vibration and shock damage,
transport the expansion module in the original
container.
• Verify that all parts shipped with the expansion
module.
• Do not drop the expansion module or subject it
to physical shock.
Parts included
• One expansion module 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
• Small straight-blade screwdriver for securing
wires in the terminal blocks
Physical features
The following figure displays the physical features
of an IOM, and the accompanying table provides a
*24101431124E*
Part No. 24-10143-1124 Rev. E
2020-10-30
(barcode for factory use only)
MS-IOM3723
description of the physical features and a reference
to further information where required.
Figure 1: IOM3723 physical features
Table 1: IOM3723 features callout numbers and
descriptions
Callo
ut Physical features: description and references
1Device Address DIP Switch Block (see Setting the device
address)
224 VAC, Class 2 Supply Power Terminal Blocks (see Supply
power terminal block)
3 Cover Lift Tab (see Removing the expansion module cover)
4Sensor Actuator (SA) Bus/Field Controller (FC) Bus
Terminal Block (see SA/FC bus terminal block)
5End-of-Line (EOL) Termination Switch (see Setting the End-
of-Line (EOL) switch)
6Binary Input (BI) Terminal Block (see Input and Output
wiring guidelines)
7 LED Status Indicators (see Table 7)
8 Mounting Clips
Mounting
Observe these guidelines when mounting an IOM
expansion module:
• Ensure the mounting surface can support the
expansion module, DIN rail, and any user-
supplied enclosure.
• Mount the expansion module horizontally on
35 mm (1.4 in.) DIN rail whenever possible.
• Mount the expansion module in the proper
mounting position (Figure 2).
• Mount the expansion module on a hard, even
surface whenever possible in wall-mount
applications.
• Use shims or washers to mount the expansion
module securely and evenly on the mounting
surface.
IOM3723 Input/Output Module Installation Guide2
• Mount the expansion module in an area
free of corrosive vapors and observe the
Ambient Conditions requirements in Technical
specifications.
• Provide for sufficient space around the
expansion module for cable and wire
connections for easy cover removal and good
ventilation through the expansion module (50
mm [2 in.] minimum on the top, bottom, and
front of the expansion module).
• Do not mount the expansion module on
surfaces prone to vibration, such as duct work.
• Do not mount the expansion module in areas
where electromagnetic emissions from other
devices or wiring can interfere with expansion
module communication.
Observe these additional guidelines when mounting
an expansion module in a panel or enclosure:
• Mount the expansion module so that the
enclosure walls do not obstruct cover removal
or ventilation through the expansion module.
• Mount the expansion module so that the power
transformer and other devices do not radiate
excessive heat to the expansion module.
• Do not install the expansion module in an
airtight enclosure.
Figure 2: Mounting positions
Mounting features and dimensions
See the following figure for mounting dimensions
listed in millimeters and inches. Inches are listed
in parenthesis. The following figure also illustrates
the DIN rail channel and the mounting clips in an
extended position.
Figure 3: Back of expansion module
DIN rail mount applications
About this task:
Mounting the expansion module horizontally on 35
mm (1.4 in.) DIN rail is the preferred method.
To mount an expansion module on a 35 mm DIN
rail, complete the following steps:
1. Securely mount a 20 cm (8 in.) or longer
section of 35 mm (1.4 in.) DIN rail, horizontally
and centered in the desired space.
2. Pull the two bottom mounting clips outward
from the expansion module to the extended
position.
3. Hang the expansion module on the DIN rail by
the hooks at the top of the (DIN rail) channel
on the back of the expansion module, and
position the expansion module snugly against
the DIN rail.
4. Push the bottom mounting clips inward (up)
to secure the expansion module on the DIN
rail.
To remove the expansion module from the
DIN rail, pull the bottom mounting clips
out to the extended position and carefully
lift the expansion module off the DIN rail.
Wall mount applications
About this task:
IOM3723 Input/Output Module Installation Guide 3
To mount an expansion module directly on a wall
or other flat vertical surface, complete the following
steps:
1. Pull the two bottom mounting clips outward
and ensure they are locked in the extended
position.
2. Mark the mounting hole locations on the wall
using the provided dimensions and one of the
mount positions, vertical or horizontal. You
can also hold the expansion module 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 at the marked
locations, and insert appropriate wall anchors
in the holes (if necessary).
4. Hold the expansion module 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.
Wiring
WARNING
Risk of Electric Shock:
Disconnect or isolate all power supplies before
making electrical connections. More than one
disconnection 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.
CAUTION
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.
CAUTION
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 expansion
module electrical ratings. Exceeding expansion
module electrical ratings can result in
permanent damage to the expansion module
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
expansion module components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the expansion module.
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).
IOM3723 Input/Output Module Installation Guide4
Terminal blocks and bus ports
See Figure 1 for terminal block and bus port
locations on the expansion module. Observe the
following guidelines when wiring an expansion
module.
Input terminal blocks
The IOM3723 has inputs only (no outputs). The
inputs are located on both the top and bottom
of the expansion module. 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 an SA bus or an 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 expansion module,
and the other expansion modules in a daisy-chain
configuration using 3-wire twisted, shielded cable as
shown in the following figure.
Figure 4: FC bus terminal block wiring
When connecting the IOM to an SA bus, wire the bus
terminal block plugs on the expansion module and
other SA bus devices in a daisy-chain configuration
using 4-wire twisted, shielded cable as shown in
Figure 5.
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.
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 expansion
module.
Wire the 24 VAC supply power wires from the
transformer to the HOT and COM terminals on the
terminal plug as shown in Figure 6. The middle
terminal on the supply power terminal block is not
used.
IOM3723 Input/Output Module Installation Guide 5
Figure 6: 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 expansion module 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 expansion module
does not require an earth ground connection.
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
expansion module input and output terminals, and
references guidelines for determining proper wire
sizes and cable lengths.
In addition to the wiring guidelines in Table 2
• 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., observe these guidelines when wiring
controller inputs and outputs:
• 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.
IOM3723 Input/Output Module Installation Guide6
I/O terminal blocks, ratings, and
requirements
Table 2: IOM3723 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 16 V, 10K ohm pull
up
INnBinary Input - Pulse Counter/Accumulator Mode
0.01 second minimum pulse width
(50 Hz at 50% duty cycle)
Internal 16 V, 10K 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.
Note: For all Binary ICOMn terminals, BI is isolated from
the FC bus common.
See Guideline A in Table 3.
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
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 the cable and the connected
input device, you may have to define an offset
in the setup software for the input or output
point.
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
0.5 mm (24 AWG) stranded copper 61 m (200 ft) twisted wire
100 mV maximum voltage drop
Depending on the cable and the connected
input device, you may have to define an offset
in the setup software for the input or output
point.
CSee Figure 7 to select wire size/gauge. Use
stranded copper wire.
See Figure 7 to determine
cable length. Use twisted
wire cable.
N/A
Maximum cable length versus load
current
Use the following figure to estimate the maximum
cable length relative to the wire size and the load
current (in mA) when wiring inputs.
Note: The following information applies to low-
voltage (<30 V) inputs only.
IOM3723 Input/Output Module Installation Guide 7
Figure 7: Maximum wire length for low-voltage
(<30 V) Inputs by current and wire Size
Communications bus and supply power
wiring guidelines
Table 4 provides information about the functions,
ratings, and requirements for the expansion
module's communication bus and supply power
terminals; it additionally provides guidelines for wire
sizes, cable types, and cable lengths when wiring
the expansion module communication buses and
supply power.
In addition to the guidelines in Table 4, observe the
following 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.
Communications bus and supply power terminal blocks, ratings, 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
FC Bus
or
SA Bus SHLD
or
SA PWR
SHLD on FC Bus: Isolated terminal (optional
shield drain connection)
SA PWR on SA Bus: 15 VDC power lead
connection
Note: The SA PWR terminal on an IOM
expansion module does not supply 15
VDC. The SA bus supervisor 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
0.8 mm to 1.0 mm
(18 AWG) 2-wire
IOM3723 Input/Output Module Installation Guide8
Note: See Table 3 to determine wire size and
cable lengths for cables.
Note: The SA Bus and FC Bus wiring
recommendations in this table are for MS/
TP bus at 38,400 baud. For more information,
refer to the MS/TP Communications Bus Technical
Bulletin (LIT-12011034).
Termination details
A set of Johnson Controls termination diagrams
provides details for wiring inputs and outputs to the
controllers. See the following table in this section for
the applicable termination diagram.
Table 5: Termination details
Type of device Type of Input/
Output Termination diagrams
Dry Contact (Binary Input) BI
Setup and Adjustments
Setting the device address
About this task:
Metasys expansion modules are master devices
on MS/TP (SA or FC) buses. Before operating an
expansion module on a bus, you must set a valid
and unique device address for each expansion
module on the bus. You set an expansion module's
device address by setting the positions of the
switches on the DIP switch block at the top of the
expansion module . Device addresses 4 through
127 are the valid addresses for these expansion
modules.
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
ZFR/ZFR Pro Series Wireless Field Bus. Switch 128
must be set to off for all hard-wired SA and FC bus
applications.
Figure 8: Device address DIP switch block set to
address 21
Note: Metasys 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 do not interfere with bus operation. Set
a valid and unique device address on the
expansion module before applying power to
the expansion module on the bus.
To set the device addresses on Metasys
expansion modules, complete the following
steps:
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, and ensure that switch 128
remains set to OFF.
IOM3723 Input/Output Module Installation Guide 9
Note: To do this, 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 switches 16, 4, and 1 to
ON (16+4+1= 21) and all other switches to
OFF.
3. Set a unique and sequential device address
for each of the expansion modules connected
on the SA or FC bus starting with device
address 4.
Note: 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 expansion modules do not need to be
physically connected on the bus in their
numerical device address order.
4. Write each expansion module's device
address on the white label below the DIP
switch block on the expansion module's
cover.
The following table describes the FC bus
and SA bus device addresses for Johnson
Controls MS/TP communications bus
applications.
Table 6: SA/FC bus device address descriptions
Device Address Use on Descriptions
0
(Switch 128 Off)
Reserved for FC Bus Supervisory Controller (not
for use on controllers or expansion modules).
1-3
(Switch 128 Off)
Reserved for peripheral devices (not for use on
controllers or expansion modules).
4-127
(Switch 128 Off)
Used for MSTP master devices (controllers and
expansion modules) that are hardwired to an
SA bus or FC bus.
Removing the expansion module
cover
About this task:
Important: Electrostatic discharge can damage
expansion module components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the expansion module.
Important: Disconnect all power sources to
the expansion module before removing cover
and changing the position of any jumper or the
EOL switch on the expansion module. Failure to
disconnect power before changing a jumper or
EOL switch position can result in damage to the
expansion module and void any warranties.
The expansion module 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 expansion module cover,
complete the following steps:
1. Place your fingernails under the two cover lift
tabs 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 onto the latches until they snap into the
latched position.
Setting the End-of-Line (EOL) switch
About this task:
Each expansion module has an EOL switch, which
when set to ON, sets the expansion module as a
terminating device on the bus. See Figure 1 for the
EOL switch location. The default EOL switch position
is OFF.
Figure 9: End-of-Line switch positions
To set the EOL switch on an expansion module,
complete the following steps:
1. Determine the physical location of the
expansion module on the SA or FC bus.
2. Determine if the expansion module must be
set as a terminating device on the bus.
IOM3723 Input/Output Module Installation Guide10
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