Johnson Controls IOM3733 Installation Instructions Manual

IOM3733 Input/Output Module Installation

Guide

Part No. 24-10143-1140 Rev. D

2019-10-01

Application

The MS-IOM3733 input/output expansion module
is part of the Metasys® system Field Equipment
Controller family. Input/Output expansion modules
(IOMs) expand the number of input/output points
connected to either a 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 IOM3733 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 IOMs
communicate using the BACnet MS/TP protocol
when directly connected to the FC bus.

Note: With Release 10.1 and later of the
Controller Configuration Tool (CCT), VMAs, FECs,
and FACs can be configured to communicate
by 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 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

• 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

*24101431140D*

(barcode for factory use only)

MS-IOM3733

Physical features

The following figure displays the physical features
of the IOM, and the accompanying table provides a

Figure 1: IOM3733 physical features

description of the physical features and a reference
to further information where required.

Table 1: IOM3733 feature callouts and
descriptions

Callo

Physical feature: description and references

ut

1 Binary Output (BO) Terminal Block (see Table 2)
2 Mounting Clip (Three Total) (see Figure 1)
3 Device Address DIP Switch Block (see )

24 VAC, Class 2 Supply Power Terminal Block (see Supply

4

Power Terminal Block)

Cover Lift Tab (One of Two) (see Removing the expansion

5

module cover)

Sensor Actuator (SA) Bus / Field Controller (FC) Bus

6

Terminal Block (see SA/FC bus terminal block)
End-of-Line (EOL) Termination Switch (see Setting the

7

End-of-Line (EOL) switch)

8 Binary Input (BI) Terminal Block (see Table 2)
9 LED Status Indicators

Mounting

Observe these guidelines when mounting a
controller.

• Ensure the mounting surface can support the

controller, DIN rail, and any user-supplied
enclosure.

• Mount the controller in the proper mounting
position.

• 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 Technical specifications.

• 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.

• Mount the controller horizontally on 35 mm DIN
rail whenever possible.

IOM3733 Input/Output Module Installation Guide2

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 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
controller on 35 mm DIN rail, complete the following
steps:

1. Securely mount a 20 cm (8 in.) or longer section
of 35 mm DIN rail horizontally and centered in
the desired space so that the controller mounts
in the horizontal position.

2. Pull the two bottom mounting clips outward
from the controller to the extended position.

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, and position the controller
snugly against the DIN rail.

4. Push the bottom mounting clips inward (up) to
secure the controller on the DIN rail. To remove
the controller from the DIN rail, pull the bottom
mounting clips out to the extended position
and carefully lift the controller off the DIN rail.

Mounting features and dimensions

Figure 3: Back of controller showing extended
mounting clips, DIN rail channel, and mounting
dimensions, mm (in.)

Wall-mount applications

To mount the controller 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 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 at the marked
locations, and insert appropriate wall anchors
in the 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.

IOM3733 Input/Output Module Installation Guide 3

Wiring

Observe the following guidelines when wiring a
controller:

Important: Electrostatic discharge can
damage controller components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the controller.

CAUTION

Risk of Electric Shock

Disconnect the power supply before making electrical
connections to avoid electric shock.

ATTENTION

Mise En Garde: Risque de décharge électrique

Débrancher l'alimentation avant de réaliser tout rac­cordement électrique afin d'éviter tout risque de
décharge électrique.

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.

ATTENTION

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 expansion module. Observe the
following guidelines when wiring an expansion
module:

Input and output Terminal Blocks

Most 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 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 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 controller and expansion modules
in a daisy-chain configuration using 3-wire twisted,
shielded cable as shown in Figure 4.

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.

IOM3733 Input/Output Module Installation Guide4

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 (FAC, FEC, or
VMA) 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 board­mounted 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 the following figure:

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 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.

Terminal Wiring Guidelines, Functions, Ratings, and Requirements

Input and output wiring guidelines

The following table 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 the following
table, observe these guidelines when wiring
controller inputs and outputs:

• Run all low-voltage wiring and cables separate

from high-voltage wiring.

IOM3733 Input/Output Module Installation Guide 5