Honeywell Morley IAS MI DISO addressable loop isolator module with tri-colour LED indicator

Honeywell MI DISO Loop Isolation Module

KTI07001001ISOL

Product Description

The Honeywell Morley-IAS MI-DISO is an addressable loop short-circuit isolation module designed to safeguard analogue addressable fire alarm loops by isolating faulted cable sections.

Make/Brand: Honeywell
Model: MI-DISO
Operating Voltage: 15 to 30 V DC
Standby Current: 200 µA maximum at 24 V DC
Switch-on Resistance: 0.065 Ω maximum at 15 V DC
Fault Detection Delay: 100 ms to 400 ms
Device Capacity: Up to 25 addressable devices between consecutive isolator modules
Status Indication: Tri-colour diagnostic LED visible across two orthogonal planes
Field Wiring Terminals: Plug-in screw terminal blocks accepting conductors up to 2.5 mm²
Mounting Options: Requires M200E-SMB enclosure for surface wall mounting or M200E-DIN adapter for 35 mm DIN rail mounting
System Compatibility: Honeywell Morley-IAS intelligent analogue addressable fire alarm control panels (ZX and DXc series)
Compliance Standards: EN 54-17:2005, CEA GEI 1-084, GEA GEI 1-082

KTI07001001ISOL

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Product Details
Available Brands	Honeywell
Unit	Numbers
HSN Code	85311020
Weight	0.062 kg
Dimension	L 9.4 x W 9.3 x H 2.3 cm cm ft in m
Warranty	12 Months Warranty
Tags/categories	Safety Fire Safety Solutions Fire Alarm System Addressable Fire Alarm System

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About this product .

The Honeywell Morley-IAS MI-DISO loop isolation module provides automated bidirectional short-circuit protection across intelligent analogue addressable fire detection loops. When an abnormal voltage drop indicates a wire-to-wire short circuit, the module opens its solid-state bilateral switches within 100 to 400 milliseconds, electrically disconnecting the affected loop segment while preserving uninterrupted operation and signaling for all other devices on the circuit.
Constructed in a compact bare-module format measuring 93 mm by 94 mm by 23 mm, the unit is engineered for installation inside the optional M200E-SMB surface mounting box or clipped to standard 35 mm symmetric DIN rails using the optional M200E-DIN adapter. The module standalone provides an ingress protection rating of IP30, which elevates to IP50 when enclosed inside the M200E-SMB housing.
Electrical operating parameters span a DC voltage window of 15 to 30 V DC with an ultra-low quiescent current draw of no more than 200 µA at 24 V DC. The bilateral switches present a low series switch-on resistance of only 0.065 Ω at 15 V DC, ensuring negligible voltage drop across complex, extended commercial building loops.
Diagnostics are simplified via a multi-state tri-colour LED visible in two orthogonal viewing planes, providing continuous real-time visual verification of normal supervisory status, fault condition, or loop isolation. Field wiring is terminated via plug-in removable screw terminals rated for solid or stranded conductors up to 2.5 mm².
Designed to support up to 25 addressable field devices between adjacent isolators, the MI-DISO is fully compatible with Morley-IAS intelligent fire alarm control panels, including the ZX and DXc series. The unit is engineered and tested in full compliance with European life-safety standard EN 54-17:2005.
Routine maintenance requires periodic visual confirmation through the inspection window of the mounting enclosure without opening the housing. The plug-in terminal block architecture allows swift, error-free module replacement during testing or servicing without disturbing field cable terminations.

Product Information .

Hospitals, Clinics Shopping Malls, Showrooms Government Buildings, Offices Banks Airports Railways, Bus Stations Conference Rooms Auditorium Conference Hall Production Floors Construction Sites

System and Hardware Compatibility: Honeywell Morley-IAS MI-DISO Loop Isolation Module

The Honeywell Morley-IAS MI-DISO loop isolation module (KTI07001001ISOL) is engineered for direct deployment across Morley-IAS intelligent analogue addressable fire alarm networks. Built on the standardized System Sensor 200 series mechanical and electrical platform, the module provides bidirectional short-circuit protection to preserve loop integrity across commercial, industrial, and institutional fire safety infrastructures.

Fire Alarm Control Panel Interoperability

The MI-DISO isolator module operates seamlessly on Morley-IAS intelligent analogue addressable fire alarm control panels, including the Morley-IAS ZX series and DXc series panels. When incorporated into the signaling line circuit (SLC), the module operates within an analogue loop voltage window of 15 to 30 V DC. It imposes a low quiescent load on the panel's loop driver circuits, drawing a maximum standby current of 200 µA at 24 V DC with a minimal switch-on resistance of 0.065 Ω maximum at 15 V DC. Between any two adjacent isolator modules, system designers can deploy up to 25 addressable loop devices or sensors without degrading loop communications or threshold detection.

Mechanical Mounting and Enclosure Hardware

Because the bare MI-DISO module is supplied as an unhoused unit measuring 93 mm (Height) x 94 mm (Width) x 23 mm (Depth) with a weight of 62 g, proper site installation requires dedicated mechanical mounting hardware from the 200 series accessory range:

Surface Wall Mounting: Requires the M200E-SMB surface mount box (or M200E-SMB-KO knock-out variant). Installing the bare module (rated standalone at IP30) into the M200E-SMB enclosure upgrades the assembly to an IP50 ingress protection rating. The enclosure design allows viewing of the tri-colour status LED and address switches in two planes without detaching the cover.
DIN Rail Mounting: Requires the M200E-DIN mounting clip adapter to secure the module directly onto standard 35 mm symmetric DIN rails inside auxiliary control enclosures and marshalling cabinets.
Panel Mounting: Compatible with the M200E-PMB mounting bracket clip for custom equipment rack and enclosure chassis integration.

Field Wiring and Terminal Capacity

The unit features detachable plug-in screw terminal blocks designed for rapid wiring termination, loop testing, and servicing without disconnecting field cores individually. The terminal blocks accept solid or stranded conductors up to a maximum wire gauge capacity of 2.5 mm², maintaining continuous contact across field operating temperatures from -20 °C to +60 °C and non-condensing relative humidity levels from 0% to 95%.

Standards and Regulatory Compliance

The electrical and functional performance of the MI-DISO conforms strictly to regional and international fire safety life-safety standards:

EN 54-17:2005: Certified for short-circuit isolators under Construction Products Regulation (CPR) certificate 0786-CPR-21643.
Third-Party Approvals: Certified by VdS under approval certificate G202142 and certified by the Loss Prevention Certification Board (LPCB).
European Specifications: Fully compliant with GEA GEI 1-082 and CEA GEI 1-084 technical specifications.
Trade Harmonization: Categorized under HSN/Customs tariff classification code 85311020.

Mechanical Mounting, Field Wiring & Commissioning Guidelines

The Honeywell Morley-IAS MI-DISO loop isolation module is supplied as a compact bare unit measuring 93 mm in height, 94 mm in width, and 23 mm in depth, with a net unit weight of 62 g. Because the unhoused module carries an ingress protection rating of IP30, it requires dedicated mechanical hardware depending on the installation environment. For surface wall-mount deployments, the module must be paired with the external M200E-SMB surface-mount enclosure, which elevates the ingress protection rating to IP50. For control panel enclosures or distribution boards utilizing standard 35 mm DIN rails, the module requires the M200E-DIN mounting clip adapter (or M200E-PMB clip ecosystem). Neither mounting accessory is included in the base module package and must be specified separately.

Field Wiring & Plug-In Terminal Connections

The unit features detachable plug-in screw terminal blocks designed to simplify rough-in wiring and speed up commissioning. Technicians can route and terminate loop cables into the removable terminal blocks prior to affixing the module chassis. The screw terminals accept solid or stranded conductors up to a maximum wire gauge of 2.5 mm². This plug-in terminal architecture allows rapid module replacement during maintenance without disconnecting individual loop field cores from their terminal points.

Loop Configuration & Device Capacity

When engineering Morley-IAS analogue addressable fire alarm loops (including Morley-IAS ZX and DXc series control panels), the MI-DISO module must be positioned along the two-wire circuit to section off wiring runs. System design rules allow a maximum of 25 addressable devices or sensors between consecutive isolator modules. The module operates across an analogue addressable loop voltage range of 15 to 30 V DC, drawing a low quiescent standby current of 200 µA maximum at 24 V DC. In normal operating conditions, the module maintains a minimal switch-on resistance of 0.065 Ω maximum at 15 V DC to avoid parasitic voltage drops across the signalling circuit.

Fault Isolation & Environmental Tolerances

Upon detection of a wire-to-wire short circuit, the internal bilateral solid-state switches activate within a fault detection delay window of 100 ms to 400 ms, automatically isolating the damaged loop segment and preventing entire loop collapse. The MI-DISO is designed to operate continuously across an ambient temperature range of -20 °C to +60 °C and relative humidity levels between 0% and 95% (non-condensing).

Address Configuration & Diagnostic Inspection

The module features onboard decade rotary switches and a diagnostic tri-colour status LED that are both engineered for multi-angle visibility in two orthogonal planes. When installed inside the M200E-SMB surface box, both the decade address switches and the tri-colour LED indicator can be clearly inspected through the transparent viewing window of the cover without disassembling or opening the enclosure.

Installation Parameter	Specification / Requirement
Bare Module Dimensions (H x W x D)	93 mm x 94 mm x 23 mm
Unit Net Weight	62 g
Ingress Protection	IP30 (bare unit) / IP50 (inside M200E-SMB)
Mounting Accessories	M200E-SMB (surface wall mount) or M200E-DIN (35 mm DIN rail)
Terminal Conductor Capacity	Up to 2.5 mm² maximum
Operating Loop Voltage	15 to 30 V DC
Standby Quiescent Current	200 µA maximum at 24 V DC
Switch-On Resistance	0.065 Ω maximum at 15 V DC
Fault Detection Delay	100 ms to 400 ms
Maximum Devices Between Isolators	Up to 25 addressable devices or sensors
Operating Temperature / Humidity	-20 °C to +60 °C / 0 to 95% RH (non-condensing)

Troubleshooting and Diagnostics Guide for Honeywell Morley-IAS MI-DISO Loop Isolation Module

Interpreting Loop Isolation and Voltage Drop Faults

The Honeywell Morley-IAS MI-DISO isolator module operates autonomously along analogue addressable loops to protect communication circuits against wire-to-wire short circuits. When an electrical short circuit occurs on the signaling line circuit (SLC), the two isolator modules located immediately adjacent to the faulted section detect the sudden voltage drop. These modules open their bilateral solid-state isolation switches within a fault detection delay window of 100 ms to 400 ms, disconnecting the defective wiring section while sustaining power and communication to all functional devices on the remainder of the Morley-IAS ZX or DXc loop.

If the fire alarm control panel indicates an open-circuit or isolated segment fault, inspect the physical cable segment between the two activated isolators. Once the physical conductor fault is resolved, the module senses line restoration and automatically resets, re-establishing continuous loop continuity without requiring a manual hardware reboot.

Visual Diagnostics via the Tri-Colour Status LED

Field commissioning engineers can verify module operation directly via the integrated tri-colour status LED, which is engineered for visibility across two orthogonal planes. When installed within the surface-mount M200E-SMB enclosure, both the diagnostic LED and the rotary address selector switches remain visible through the enclosure cover without disassembling the box.

Continuous or Flashing Fault Indication: Indicates that the module has actively opened its internal switch due to an active short-circuit condition on the adjacent loop branch, or line operating voltage has fallen below the 15 V DC operating limit.
Normal Polling Indication: Confirms normal quiescent operation with loop supervisory voltage maintained within the rated 15 to 30 V DC threshold and standby current consumption capped at or below 200 µA at 24 V DC.
Unresponsive LED: Indicates complete loop power failure, terminal polarity reversal, or unseated plug-in connector headers.

Diagnostic Matrix and Corrective Actions

The following table outlines primary field fault conditions, technical root causes, and recommended diagnostic procedures conforming to EN 54-17 standards:

Observed Symptom	Probable Root Cause	Field Verification & Corrective Action
Isolated loop segment persists after wiring repair	Persistent wire-to-wire short or line voltage below 15 V DC	Measure DC voltage across the incoming SLC loop terminals using a calibrated multimeter. Verify that operating voltage is between 15 V DC and 30 V DC. Check loop wiring resistance to confirm switch-on resistance does not exceed 0.065 Ω at 15 V DC.
Intermittent device dropouts or communication jitter	More than 25 addressable devices connected between isolators	Count all sensors, input modules, and output modules deployed between consecutive isolators. Ensure the count does not exceed the rated maximum limit of 25 items per isolated segment.
Mechanical detachment or environmental ingress	Missing M200E-SMB enclosure or M200E-DIN rail clip	Confirm module mounting. The bare module provides an IP30 ingress rating; installing it inside the M200E-SMB surface box elevates ingress protection to IP50. For cabinet installs, verify secure latching to 35 mm DIN rail via the M200E-DIN adapter.
Open circuit indicated on loop branch	Loose conductor termination at plug-in screw terminals	Inspect wire engagement on the plug-in connector block. Verify that field conductors do not exceed the maximum terminal wire capacity of 2.5 mm² and that the plug-in terminal block is firmly seated into the module header.

Addressing Device Capacity and Electrical Specifications

A frequent commissioning error involves overloading an isolated segment. The MI-DISO is designed to protect groups of up to 25 items (sensors and addressable modules) maximum per section. Exceeding 25 devices increases line capacitance and steady-state load, which can prolong the 100 ms to 400 ms fault detection response or compromise quiescent current limits (200 µA maximum at 24 V DC).

Operating temperature must be maintained within -20 °C to +60 °C, with relative humidity between 0% and 95% (non-condensing). If field replacement is necessary during diagnostic routines, the modular plug-in screw connections allow rapid module substitution without unscrewing individual loop core conductors.

Application Scenarios and System Deployment Use Cases

The Honeywell Morley-IAS MI-DISO loop isolation module protects analogue addressable fire alarm circuits by isolating localized wire-to-wire short circuits. Operating across an input range of 15 to 30 V DC with a quiescent standby current of 200 µA at 24 V DC, the module limits loop degradation. When an electrical fault occurs, the module’s bilateral solid-state switches activate within a fault detection delay of 100 ms to 400 ms, decoupling the faulted segment while maintaining continuous communication across the remainder of the signaling line circuit.

Zone and Floor-by-Floor Partitioning in Multi-Story Buildings

In commercial offices, high-rise residential properties, and healthcare complexes, life-safety standards mandate that an electrical short circuit on one level must not disable detection on adjacent floors. Deploying the MI-DISO module at zone boundaries allows fire system engineers to partition intelligent addressable loops into compliant segments. The module supports configurations with up to 25 addressable field devices—such as sensors and call points—between consecutive isolators. If mechanical damage, crushed cabling, or water ingress causes a short circuit on a single branch, the adjacent isolators drop open to restrict system downtime to that specific branch, leaving other operational floors fully functional on Morley-IAS ZX and DXc series control panels.

DIN-Rail Marshalling Cabinets and Control Equipment Integration

For installations where fire alarm cabling interfaces with central control gear, industrial automation racks, or plant distribution boards, the MI-DISO provides high-density circuit protection. When mounted to standard 35 mm DIN rails using the optional M200E-DIN adapter clip, multiple modules can be installed inside electrical enclosures to protect outbound branch circuits. The module's low switch-on resistance (0.065 Ω maximum at 15 V DC) minimizes loop line resistance and voltage drop, enabling long cable runs to remote plant areas without exceeding system thresholds.

Surface Deployment in Challenging Plant Environments

Industrial processing facilities, mechanical service rooms, and warehouses often expose field fire equipment to dust and variable temperatures. Rated for operation between -20 °C and +60 °C and non-condensing relative humidity up to 95%, the MI-DISO maintains reliable operation in non-climate-controlled spaces. When field mounted using the dedicated M200E-SMB surface box, ingress protection increases from IP30 (bare unit) to IP50, preventing particulate accumulation on the circuit assembly and plug-in screw connections.

Compliance Architecture Summary

Deployment Parameter	Module Specification	System Engineering Consideration
Maximum Devices per Segment	Up to 25 addressable devices	Prevents widespread device loss during cable failure
Switch Isolation Response Time	100 ms to 400 ms	Rapid fault isolation prior to total loop collapse
Loop Operating Voltage	15 to 30 V DC	Standard Honeywell Morley-IAS loop power compatibility
Conductor Wire Accommodation	Up to 2.5 mm²	Supports standard fire-rated loop cable cross-sections
Mounting Configuration	M200E-SMB box or M200E-DIN clip	Enables IP50 wall mounting or 35 mm DIN rail integration
Diagnostic Visibility	Tri-colour LED in 2 planes	External status checks through M200E-SMB enclosure

The MI-DISO fulfills life-safety architecture compliance requirements certified under EN 54-17 (CPR 0786-CPR-21643), LPCB, VdS (G202142), CEA GEI 1-084, and GEA GEI 1-082. Field technicians can verify operational status without opening the protective housing via the diagnostic tri-colour LED window and inspect decade address rotary switches across two planes during routine maintenance.

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