Johnson Controls IOM3731-0A, IOM3721 Installation Instructions Manual

IOM3731-0A Input/Output Module Installation Instructions

Part No. 24-10144-165, Rev. CMS-IOM3731-0A

Software Release 6.0

Issued January 30, 2013

Supersedes December 5, 2011

Refer to the QuickLIT Web site for the most up-to-date version of this document.

Application

The IOM3731-0A field controller is a part of the Metasys®
system Field Equipment Controller family. Input/Output
Module (IOM) field controllers expand the number of
points connected to a Network A utomation Engine (NAE),

Network Control Engine (NCE), Field Equipment
Controller (FEC), or Advanced Application Field
Equipment Controller (F AC)to monitor and control a wide

variety of Heating, Ventilating, and Air Conditioning
(HVAC) equipment.

IOM field 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 Metasys system.

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 is likely to cause
harmful interference, in which case the user will be
required to correct the interference at his/her own
expense.

Important: In Metasys system smoke control

applications, use only the MS-IOM3710-0U
models that are UL Listed, UUKL/UUKLC
864 Listed, Smoke Control Equipment. For
Metasys system smoke control applications,
you must refer to the Metasys System UL

864 Ninth Edition UUKL/UUKL7 Smoke
Control System Technical Bulletin
(LIT-12011252) for detailed requirements

and procedures for installing and operating
UUKL/UUKLC 864 Listed Metasys system
devices. Failure to meet the requirements
or follow the procedures in the Metasys

System UL 864 Ninth Edition UUKL/UUKL7
Smoke Control System Technical Bulletin
(LIT-12011252) can void the UUKL/UUKLC

864 listing for Smoke Control Equipment.

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.

Installation

Observe these guidelines when installing a field 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 field 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

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 1).

1IOM3731-0A Input/Output Module Installation Instructions

• 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 8.

• 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
field 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: Field Controller Mounting Positions

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

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 2.

2. Mark the 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/surface in a proper mount position and
mark the hole locations through the mounting clips.

3. Drill holes in the wall/surface at the marked locations,
and insert appropriate wall anchors in the holes (if
necessary).

4. Hold the field controller in place, and insert the screws
through the mounting clips and into the holes (or
anchors). Carefully tighten all of the screws.

DIN Rail Mount Applications

Mounting the field 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 1.

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.)

2IOM3731-0A Input/Output Module Installation Instructions

Figure 3: IOM3731-0A Physical Features

Table 1: IOM3731 Feature Callouts and Descriptions

Physical Feature: Description and ReferencesCallout

1

2

3

4

5

6

7

8

9

Binary Outputs (BOs) Terminal Block. (See Table 2)

Mounting Clip (Three Total) (See Figure 3)

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 2)

LED Status Indicators (See Table 6)

Sensor Actuator (SA) Bus or Field Controller (FC) Bus Port (RJ-12 6-pin Modular Jack) (See SA/FC Bus Port)

3IOM3731-0A 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.

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.

Important: Do not exceed the controller electrical

ratings. Exceeding controller electrical
ratings can result in permanent damage to
the controller and void any warranty.

When connecting the IOM to an FC bus, wire the bus
terminal block plugs on the controller, and the other field
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

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).

IOM Terminal Blocks and Bus Ports

See Figure 3 for terminal block and bus port locations on
the controller. Observe the following guidelines when
wiring a controller.

Input and Output Terminal Blocks

On most field controller models, 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.

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

SA/FC Bus Terminal Block

An IOM 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.

4IOM3731-0A Input/Output Module Installation Instructions