IOM3731-0A Expansion Input/Output InstallationGuide

ApplicationThe IOM3731-0A expansion module is part of the Metasys®system Field Equipment Controller family. Input/Outputexpansion modules (IOMs) expand the number of input/output points connected to either a Network AutomationEngine (NAE), Network Control Engine (NCE), AdvancedApplication Field Equipment Controller (FAC), FieldEquipment Controller (FEC), or Variable Air VolumeModular Assembly (VMA) to monitor and control a widevariety of HVAC equipment.IOM expansion modules operate on an RS-485 BACnet®MS/TP bus and integrate into Johnson Controls and third-party BACnet systems. IOMs communicate using theBACnet MS/TP protocol when directly connected to the FCbus.

Note: With Release 10.1 and later of the ControllerConfiguration Tool (CCT), VMAs, FECs, and FACscan be configured to communicate by using eitherthe BACnet MS/TP or the N2 field bus networkingprotocol. The operation of the IOM is not affected bythe selection of the BACnet MS/TP or the N2 protocolin the host controller, when the IOM is connected tothe host controller using the SA bus.

North American emissions compliance

United StatesThis equipment has been tested and found to comply withthe limits for a Class A digital device pursuant to Part 15of the FCC Rules. These limits are designed to providereasonable protection against harmful interference whenthis equipment is operated in a commercial environment.This equipment generates, uses, and can radiate radiofrequency energy and, if not installed and used inaccordance with the instruction manual, may causeharmful interference to radio communications. Operationof this equipment in a residential area may cause harmfulinterference, in which case the users will be required tocorrect the interference at their own expense.

CanadaThis Class (A) digital apparatus meets all the requirementsof the Canadian Interference-Causing EquipmentRegulations.Cet appareil numérique de la Classe (A) respecte toutesles exigences du Règlement sur le matériel brouilleur duCanada.

InstallationObserve these guidelines when installing an expansionmodule:• Transport the expansion module in the original

container to minimize vibration and shock damage.• 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 (only)• Small straight-blade screwdriver for securing wires in

the terminal blocks

*2410144165J*

Part No. 24-10144-165 Rev. J

2019-10-18

(barcode for factory use only)

MS-IOM3731-0A

Physical featuresThe following figure displays the physical features of theIOM, and the accompanying table provides a description

of the physical features and a reference to furtherinformation where required.

Figure 1: IOM3731-0A physical features

Table 1: IOM3731-0A feature callouts and descriptionsCallout Physical feature: description and references

1 Binary Outputs (BOs) Terminal Block (see Table 2)2 Mounting Clip (see Figure 1)3 Device Address DIP Switch Block (see )4 24 VAC, Class 2 Supply Power Terminal Block (see )

5 Cover Lift Tab (see Removing the expansion modulecover)

6 Sensor Actuator (SA) Bus/Field Controller (FC) BusTerminal Block (see )

7 Binary Inputs (BIs) Terminal Block (see Table 2)8 LED Status Indicators (see Troubleshooting)

9 Sensor Actuator (SA) Bus or Field Controller (FC) Bus Port(RJ-12 6-pin Modular Jack) (see SA/FC bus port)

MountingObserve the following guidelines when mounting anexpansion module:• Ensure the mounting surface can support the

expansion module, DIN rail, and any user-suppliedenclosure.

• Mount the expansion module horizontally on 35 mm(1.4 in.) DIN rail whenever possible.

• Mount the expansion module in the proper mountingposition (Figure 2).

• Mount the expansion module on a hard, even surfacewhenever possible in wall-mount applications.

• Use shims or washers to mount the expansion modulesecurely and evenly on the mounting surface.

• Mount the expansion module in an area free ofcorrosive vapors and observe the Ambient Conditionsrequirements in Table .

• Provide for sufficient space around the expansionmodule for cable and wire connections for easy coverremoval and good ventilation through the expansionmodule (50 mm [2 in.] minimum on the top, bottom,and front of the expansion module).

• Do not mount the expansion module on surfaces proneto vibration, such as duct work.

• Do not mount the expansion module in areas whereelectromagnetic emissions from other devices or wiringcan interfere with expansion module communication.

Observe these additional guidelines when mounting anexpansion module in a panel or enclosure:• Mount the expansion module so that the enclosure

walls do not obstruct cover removal or ventilationthrough the expansion module.

• Mount the expansion module so that the powertransformer and other devices do not radiate excessiveheat to the expansion module.

• Do not install the expansion module in an airtightenclosure.

IOM3731-0A Expansion Input/Output Installation Guide2

Figure 2: Mounting positions

DIN rail mount applicationsMounting the controller horizontal on 35 mm DIN rail isthe preferred mounting method. To mount a controller on35 mm DIN rail, complete the following steps:

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

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

3. Hang the controller on the DIN rail by the hooks atthe top of the (DIN rail) channel on the back of thecontroller, and position the controller snugly againstthe DIN rail.

4. Push the bottom mounting clips inward (up) tosecure the controller on the DIN rail. To removethe controller from the DIN rail, pull the bottommounting clips out to the extended position andcarefully lift the controller off the DIN rail.

Wall-mount applicationsTo mount the controller directly on a wall or other flatvertical surface, complete the following steps:

1. Pull the two bottom mounting clips outward andensure they are locked in the extended position.

2. Mark the mounting hole locations on the wall usingthe dimensions in Figure 3 and one of the mountpositions shown in Figure . Or hold the controller upto the wall or surface in a proper mount position andmark the hole locations through the mounting clips.

3. Drill holes in the wall or surface at the markedlocations, and insert appropriate wall anchors in theholes (if necessary).

4. Hold the controller in place, and insert the screwsthrough the mounting clips and into the holes (oranchors). Carefully tighten all of the screws.Important: Do not overtighten the mountingscrews. Overtightening the screws may damage themounting clips.

Mounting features and dimensions

Figure 3: Back of controller showing extendedmounting clips, DIN rail channel, and mountingdimensions, mm (in.)

WiringObserve the following guidelines when wiring a controller:

 CAUTION

Risk of Electric ShockDisconnect the power supply before making electricalconnections to avoid electric shock.

 ATTENTION

Mise En Garde: Risque de décharge électriqueDébrancher l'alimentation avant de réaliser tout rac-cordement électrique afin d'éviter tout risque dedécharge électrique.

IOM3731-0A Expansion Input/Output Installation Guide 3

 CAUTION

Risk of Property DamageDo not apply power to the system before checking allwiring connections. Short circuited or improperly con-nected wires may result in permanent damage to theequipment.

 ATTENTION

Mise En Garde: Risque de dégâts matériels:Ne pas mettre le système sous tension avant d'avoirvérifié tous les raccords de câblage. Des fils for-mant un court-circuit ou connectés de façon incor-recte risquent d'endommager irrémédiablementl'équipement.

Important: Do not exceed the controller electricalratings. Exceeding controller electrical ratings canresult in permanent damage to the controller andvoid any warranty.Important: Use copper conductors only. Makeall wiring in accordance with local, national, andregional regulations.Important: Electrostatic discharge can damagecontroller components. Use proper electrostaticdischarge precautions during installation, setup, andservicing to avoid damaging the controller.

For detailed information on configuring and wiringan MS/TP Bus, FC bus, and SA bus, refer to the MS/TPCommunications Bus Technical Bulletin (LIT-12011034).

Terminal blocks and bus portsSee Figure 1 for terminal block and bus port locations onthe expansion module. Observe the following guidelineswhen wiring an expansion module:

Input and output Terminal BlocksAll of the input terminal blocks are mounted on thebottom of the controller and the output terminal blocksare mounted on the top of the controller.See Table for more information about I/O terminalfunctions, requirements, and ratings.

SA/FC bus terminal blockAn IOM can be connected to an SA bus or an FC bus, butnot both buses simultaneously. The SA/FC bus terminalblock is a removable, 4-terminal plug that fits into aboard-mounted jack.When connecting the IOM to an FC bus, wire the busterminal block plugs on the expansion module, and theother controller and expansion modules in a daisy-chain

configuration using 3-wire twisted, shielded cable asshown in Figure 4.

Figure 4: FC bus terminal block wiring

When connecting the IOM to an SA bus, wire the busterminal block plugs on the expansion module and otherSA bus devices in a daisy-chain configuration using 4-wiretwisted, shielded cable as shown in Figure 5.

Figure 5: SA bus terminal block wiring

Note: The SA PWR/SHLD terminal does not supply 15VDC. The SA PWR/SHLD terminal is isolated and canbe used to connect (daisy chain) the 15 VDC powerleads on the SA bus (Figure 5) or the cable shieldson the FC bus (Figure 4). The SA bus supervisor (FAC,FEC, or VMA) supplies 15 VDC to devices on the SAbus requiring power.

SA/FC bus portThe SA/FC bus port on the front of the expansion moduleis an RJ-12, 6-position modular jack that provides aconnection for devices on the SA bus, a Bluetooth®Commissioning Converter, or ZFR/ZFR Pro WirelessRouter (depending on which bus the expansion module isoperating on).

IOM3731-0A Expansion Input/Output Installation Guide4

The SA/FC bus port is connected internally to the SA/FCbus terminal block. See for more information. The SA/FCbus port pin assignment is shown in Figure 6.

Figure 6: Pin number assignments for sensor, SA busand FC bus ports on expansion modules

Supply power terminal blockThe 24 VAC supply power terminal block is a gray,removable, 3-terminal plug that fits into a board-mountedjack on the top right of the expansion module.Wire the 24 VAC supply power wires from the transformerto the HOT and COM terminals on the terminal plug asshown in the following figure. The middle terminal on thesupply power terminal block is not used.

Figure 7: 24 VAC supply power terminal block wiring

Note: The supply power wire colors may be differenton transformers from other manufacturers. Refer tothe transformer manufacturer’s instructions and theproject installation drawings for wiring details.

Important: Connect 24 VAC supply power to theexpansion module and all other network devicesso that transformer phasing is uniform across thenetwork devices. Powering network devices withuniform 24 VAC supply power phasing reducesnoise, interference, and ground loop problems. Theexpansion module does not require an earth groundconnection.

Wireless network applicationsIf wireless capability is available at the site, the expansionmodule can also be installed in a wireless applicationusing ZFR/ZFR Pro Wireless Field Bus Router.To configure an expansion module for use with the ZFR/ZFR Pro Series Wireless Field Bus system:

Note: IOMs can communicate wirelessly on the FCbus only.

1. Connect the ZFR/ZFR Pro Wireless Field Bus Router tothe FC bus port (RJ-12 modular jack) on the front ofthe expansion module.

2. Ensure that the expansion module's device addressDIP switches are set to the correct device address.See.

3. Set DIP switch 128 to ON, which enables wirelessoperation on the expansion module.

For more information on the ZFR Pro Wireless Field Bussystem, refer to the WNC1800/ZFR182x Pro Series WirelessField Bus System Product Bulletin (LIT-12012320).For more information on the ZFR 1800 Wireless Field Bussystem, refer to the ZFR1800 Series Wireless Field Bus Sys-tem Product Bulletin (LIT-12011336).

Terminal Wiring Guidelines,Functions, Ratings, andRequirements

Input and output wiring guidelinesThe following table provides information and guidelinesabout the functions, ratings, and requirements for thecontroller input and output terminals; and referencesguidelines for determining proper wire sizes and cablelengths.In addition to the wiring guidelines in the following table,observe these guidelines when wiring controller inputsand 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 outputcables.

• Shielded cable is required for input and output cablesthat are exposed to high electromagnetic or radiofrequency noise.

IOM3731-0A Expansion Input/Output Installation Guide 5

• Inputs or 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 inthe input/output software setup.

IOM3731-0A Expansion Input/Output Installation Guide6

I/O terminal blocks, ratings, andrequirements tableTable 2: IOM3731-0A terminal blocks, functions, ratings, requirements, and cables

Terminal block label Terminallabel Function, ratings, requirements Determine wire size and

maximum cable lengthBinary Input - Dry Contact Maintained Mode0.01 second minimum pulse widthInternal 16V, 10K ohm pull up

INn Binary Input - Pulse Counter/Accumulator Mode0.01 second minimum pulse width(50 Hz at 50% duty cycle)Internal 16V, 10K ohm pull up

BINARY INPUT

ICOMn Binary Input Common for all Binary Input (IN) terminals

See Guideline A in Table 3.

OUTn

Binary Output - 24 VAC Triac (External Power)Connects OUTn to OCOMn when activated.External Power Source Requirements:30 VAC maximum output voltage0.5 A maximum output current1.3 A at 25% duty cycle40 mA minimum load current

BINARY OUPUT(External Power SourceOnly)

OCOMn Binary Output Common (for OUTn terminal)

See Guideline C in Table 3.

Cable length guidelines for required wiresizesThe following table defines cable length guidelines for thevarious wire sizes that may be used for wiring low-voltage(<30 V) input and outputsTable 3: Cable length guidelines for required wire sizes for low-voltage (<30 V) inputs and outputs

Guideline Wire size/Gauge and type Maximum cable lengthand type Assumptions

1.0 mm (18 AWG) stranded copper 457 m (1,500 ft) twistedwire

0.8 mm (20 AWG) stranded copper 297 m (975 ft) twisted wire0.6 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 dropDepending on cable and the connected inputor output device, you may have to define anoffset in the setup software for the input oroutput point.

1.0 mm (18 AWG) stranded copper 229 m (750 ft) twisted wire0.8 mm (20 AWG) stranded copper 137 m (450 ft) twisted wire0.6 mm (22 AWG) stranded copper 91 m (300 ft) twisted wireB

0.5 mm (24 AWG) stranded copper 61 m (200 ft) twisted wire

100 mV maximum voltage dropDepending on cable and the connected inputor output device, you may have to define anoffset in the setup software for the input oroutput point.

C See Figure 8 to select wire size/gauge.Use stranded copper wire

See Figure 8 to determinecable length. Use twistedwire cable.

N/A

Maximum wire length by current and wiresizeUse the following figure to estimate the maximum cablelength relative to the wire size and the load current (inmA) when wiring inputs and outputs. This figure appliesto low-voltage (<30 V) inputs and outputs only.

IOM3731-0A Expansion Input/Output Installation Guide 7

Figure 8: Maximum wire length for low-voltageInputs and Outputs by current and wire size

Communications bus and power supplyterminal block rating and requirementsThe following table provides information about thefunctions, ratings, and requirements for the expansion

module's communication bus and supply powerterminals. It also provides guidelines for wire sizes, cabletypes,and cable lengths when wiring the expansionmodule communication buses and supply power. Inaddition, observe these guidelines when wiring an SA orFC 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 informationregarding wire size and cable length requirements forthe SA and FC buses.

Table 4: Communications bus and supply power terminal blocks, functions, ratings, requirements, and cablesTerminal block/Portlabel Terminal labels Function, electrical ratings/Requirements Recommended cable type

+-

FC or SA Bus Communications

COM Signal Reference (Common) for FC or SA Buscommunications

FC BUS or SA BUSSHLDorSAPWR

SHLD on FC Bus: Isolated terminal (optional shielddrain connectionSAP WR on SA Bus: 15 VDC power lead connection

Note: The SA PWR terminal on an IOMcontroller does not supply 15 VDC. The SABus supervisor (FAC, FEC, or VMA) supplies15 VDC to devices on the SA Bus requiringpower.

FC Bus: 0.6 mm (22 AWG) stranded,3-wire twisted, shielded cablerecommended.SA Bus: 0.6 mm (22 AWG) stranded,4-wire (2 twisted-pairs), shieldedcable recommended.

Note: On the SA Bus, the + and- wire are one twisted pair, andthe COM and SA PWR are thesecond twisted pair of wires.

HOT24 VAC Power Supply - HotSupplies 20-30 VAC (Nominal 24 VAC)24~

COM 24 VAC Power Supply - Common

0.8 mm to 1.0 mm(18 AWG) 2-wire

IOM3731-0A Expansion Input/Output Installation Guide8

Termination detailsA set of Johnson Controls termination diagrams providesdetails for wiring inputs and outputs to the controllers.

See the figures in this section for the applicabletermination diagrams.

Table 5: Termination detailsType of device Type of Input/Output Termination diagrams

Dry Contact (Binary Input) BI

Incremental Control toActuator (Switch Low,Externally Sourced)

BO

24 VAC Binary Output(Switch Low, ExternallySourced)

BO

24 VAC Binary Output(Switch High, ExternallySourced)

BO

Incremental Control toActuator (Switch High,Externally Sourced)

BO

IOM3731-0A Expansion Input/Output Installation Guide 9

Setup and Adjustments

Setting the device addressMetasys expansion modules are master devices on MS/TP (SA or FC) buses. Before operating an expansionmodule on a bus, you must set a valid and unique deviceaddress for each expansion module on the bus. You setan expansion module's device address by setting thepositions of the switches on the DIP switch block at thetop of the expansion module . Device addresses 4 through127 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 deviceaddress switches. Switch 128 must be set to off for allhard-wired SA and FC bus applications. Switch 128 mustbe set to OFF for all hard-wired SA and FC Bus applications

Figure 9: Device address DIP switch block set toaddress 21

Note: Metasys controllers ship with switch 128 ONand the remaining address switches OFF renderingthe controllers wired subordinate devices, which donot operate on MS/TP buses, but do not interferewith bus operation. Set a valid and unique deviceaddress on the expansion module before applyingpower to the expansion module on the bus.To set the device addresses on Metasys expansionmodules, complete the following steps:

1. Set all of the switches on the address DIP switchblock (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 switchnumbers set to ON equals the intended deviceaddress, and ensure that switch 128 remains set toOFF.Note: To do this, set the highest number switch thatis less than or equal to the intended device addressto ON. Then continue setting lower numberedswitches 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 allother switches to OFF.

3. Set a unique and sequential device address for eachof the expansion modules connected on the SA or FCbus starting with device address 4.

Note: To ensure the best bus performance, setsequential device addresses with no gaps in thedevice address range (4, 5, 6, 7, 8, 9, and so on). Theexpansion modules do not need to be physicallyconnected on the bus in their numerical deviceaddress order.

4. Write each expansion module's device address onthe white label below the DIP switch block on theexpansion module's cover.

The following table describes the FC bus and SA busdevice addresses for Johnson Controls MS/TP communica-tions bus applications.Table 6: SA/FC bus device address descriptionsDevice Address Use on Descriptions0(Switch 128 Off)

Reserved for FC Bus Supervisory Controller (notfor use on controllers or expansion modules).

1-3(Switch 128 Off)

Reserved for peripheral devices (not for use oncontrollers or expansion modules).

4-127(Switch 128 Off)

Used for MSTP master devices (controllers andexpansion modules) that are hardwired to anSA bus or FC bus.

Removing the expansion module coverImportant: Electrostatic discharge can damageexpansion module components. Use properelectrostatic discharge precautions duringinstallation, setup, and servicing to avoid damagingthe expansion module.Important: Disconnect all power sources to theexpansion module before removing the coverand changing the position of any jumper or theEOL switch on the expansion module. Failure todisconnect power before changing a jumper orEOL switch position can result in damage to theexpansion module and void any warranties.The expansion module cover is held in place by fourplastic latches that extend from the base and snapinto slots on the inside of the housing cover.To remove the expansion module cover, completethe following steps:

1. Place your fingernails under the two cover lift tabs(Figure 1) on the sides of the housing cover andgently pry the top of the cover away from the base torelease the cover from the two upper latches.

2. Pivot the top of the cover further to release it fromthe lower two latches.

3. Replace the cover by placing it squarely over thebase, and then gently and evenly push the coveronto the latches until they snap into the latchedposition.

Setting the End-of-Line (EOL) switchEach field controller has an EOL switch, which, when set toON, sets the controller as a terminating device on the bus.The default EOL switch position is OFF.

IOM3731-0A Expansion Input/Output Installation Guide10

Figure 10: End-of-Line switch positions

To set the EOL switch on a field controller, complete thefollowing steps:

1. Determine the physical location of the controller onthe FC bus.

2. Determine if the controller must be set as aterminating device on the bus.Note: For detailed information regarding EOLtermination rules and EOL switch settings on FCbuses, refer to the MS/TP Communications BusTechnical Bulletin (LIT-12011034).

3. If the controller is a terminating device on the FCbus, set the EOL switch to ON. If the controller is nota terminating device on the bus, set the EOL switchto Off.

When a controller is connected to power with its EOLswitch set to ON, the amber EOL LED on the controllercover is lit.

CommissioningYou commission expansion modules with the ControllerConfiguration Tool (CCT) software, using NxE Passthru,Bluetooth (with BTCVT), through Mobile Access Portal(MAP) Gateway at version 4.2 or above. Refer to theController Tool Help (LIT-12011147) for detailed informationon commissioning expansion modules.

Note: The MAP Gateway serves as a replacement forthe BTCVT, which is no longer available for purchase,but continues to be supported.

TroubleshootingObserve the Status LEDs on the front of the expansionmodule. Table 7 provides LED status indicator informationfor troubleshooting the expansion module.

LED status and states

Table 7: Status LEDs and description of LED statesLED label LED color Normal LED state Description of LED states

POWER Green On Steady

Off Steady = No Supply Power. The expansion module’s polyswitch/resettablefuse may be open. Check output wiring for short circuits and cycle power toexpansion module.On Steady = Power Connected

FAULT Red Off SteadyOff Steady = No FaultsOn Steady = Device FaultBlink - 2 Hz = Download or Startup in progress: not ready for normal operation

SA/FC BUS Green Blink - 2 HzBlink - 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 AmberOff (Except onterminatingdevices)

On Steady = EOL switch in ON positionOff Steady = EOL switch in Off position

Repair informationIf a controller fails to operate within its specifications,replace the controller. For a replacement controller,contact your Johnson Controls representative.

AccessoriesTable 8: Accessories Ordering InformationProduct Code Number DescriptionMobile Access Portal (MAP)Gateway

Refer to the Mobile Access Portal Gateway Catalog Page (LIT-1900869) to identify the appropriate productfor your region.

TP-2420 Transformer, 120 VAC Primary to 24 VAC Secondary, 20 VA, Wall Plug

IOM3731-0A Expansion Input/Output Installation Guide 11

Table 8: Accessories Ordering InformationProduct Code Number Description

Y65T31-0

Transformer, 120/208/240 VAC Primary to 24 VAC Secondary, 40 VA, Foot Mount, 8 in. Primary Leads andSecondary 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 enclosureAP-TBK4SA-0 Replacement SA Bus Terminal Blocks, 4-Position, Brown, Bulk Pack of 10AP-TBK4FC-0 Replacement FC Bus Terminal Blocks, 4-Position, Blue, Bulk Pack of 10AP-TBK3PW-0 Replacement Power Terminal Blocks, 3-Position, Gray, Bulk Pack of 10

WNC1800/ZFR182x ProWireless field Bus System

This system is used for installations that support BACnet/IP but can also coexist with the ZFR1800 Serieswhen installed under the same supervisor (i.e., network engine). Refer to the WNC1800/ZFR182x ProSeries Wireless Field Bus System Product Bulletin (LIT-12012320) for a list of available products.

ZFR1800 Series WirelessField Bus System

This system is used for installations that only support BACnet MS/TP. Refer to the ZFR1800 Series WirelessField 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 modeldescriptions.

WRZ Series Wireless RoomSensors

Refer to the WRZ Series Wireless Room Sensors Product Bulletin (LIT-12000653) for specific sensor modeldescriptions.

IOM3731-0A Expansion Input/Output Installation Guide12

Technical specificationsTable 9: IOM3731-0A technical specifications

Product Code NumberMS-IOM3731-0A Input/Output Expansion Module

Note: This model is only available in certain regions. Contact your local JohnsonControls representative for more information.

Power Requirement 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

Ambient ConditionsOperating: 0°C to 50°C (32°F to 122°F); 10% to 90% RH noncondensingStorage: -40°C to 80°C (-40°F to 176°F); 5% to 95% RH noncondensing

Addressing DIP switch set; valid expansion module device addresses 4–127 (Device addresses 0–3 and128–255 are reserved and not valid expansion module addresses.)

Communications Bus

BACnet MS/TP, RS-485:3-wire FC bus between the supervisory controller and expansion modules (for MS/TP buscommunications at 38,400 baud)4-wire SA bus between expansion module, network sensors and other sensor/actuatordevices, includes a lead to source 15 VDC supply power (from controller or expansionmodule) to bus devices (for MS/TP bus communications at 38,400 baud)

Processor RX631 Renesas® 32-bit microcontrollerMemory 4 MB external serial flash memory and 768 KB internal flash and 128 KB internal RAM

Input and Output Capabilities8 - Binary Inputs: Defined as Dry Contact Maintained or Pulse Counter/AccumulatorMode8 - Binary Outputs: Defined as 24 VAC Triac (external source power only)

TerminationsInput/Output: Fixed Screw Terminal BlocksSA/FC Bus and Supply Power: 4-Wire and 3-Wire Pluggable Screw Terminal Blocks

Mounting Horizontal on single 35 mm DIN rail mount (preferred), or screw mount on flat surfacewith three integral mounting clips on expansion module

HousingEnclosure material: ABS and polycarbonate UL94 5VB; self-extinguishing, plenum-ratedProtection Class: IP20 (IEC529)

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 andmounting clips

Note: Mounting space requires an additional 50 mm (2 in.) space on top, bottomand front face of the expansion module for easy cover removal, ventilation and wireterminations.

Weight 0.5 kg (1.1 lb)United States: UL Listed, File E107041, CCN PAZX, UL 916, Energy ManagementEquipmentFCC Compliant to CFR47, Part 15, Subpart B, Class ACanada: UL Listed, File E107041, CCN PAZX7 CAN/CSA C22.2 No. 205, Signal EquipmentIndustry Canada Compliant, ICES-003Europe: Johnson Controls declares that this product is in compliance with the essentialrequirements 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 15 Listed andCertified BACnet Smart Actuator (B-SA)

The performance specifications are nominal and conform toacceptable industry standard. For application at conditionsbeyond these specifications, consult the local JohnsonControls® office. Johnson Controls shall not be liable for

damages resulting from misapplication or misuse of itsproducts.

Product warrantyThis product is covered by a limited warranty, detailsof which can be found at www.johnsoncontrols.com/buildingswarranty.

IOM3731-0A Expansion Input/Output Installation Guide 13

Single point of contactAPAC Europe NA/SAJOHNSON CONTROLS

C/O CONTROLS PRODUCTMANAGEMENT

NO. 32 CHANGJIJANG RD NEWDISTRICT

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CHINA

JOHNSON CONTROLS

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For more contact information, refer towww.johnsoncontrols.com/locations.

© 2019 Johnson Controls. All rights reserved. All specifications and other information shown were current as of document revision andare subject to change without notice.

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