Honeywell MI/DISO addressable isolator module with tri-colour status LED indicator

Honeywell MI/DISO M200E SMB Addressable Isolator Module

KTI07001001FLIS

Product Description

The Honeywell MI/DISO (with M200E-SMB enclosure) is an intelligent analogue addressable loop short-circuit fault isolator module engineered to protect signalling line circuits from wire-to-wire short faults.

Make / Brand: Honeywell
Model: MI/DISO with M200E-SMB
Operating Voltage: 15 to 30 V DC (peak)
Standby Current: 200 µA at 24 V DC maximum
Maximum On-Resistance: 0.065 Ω at 15 V DC
Fault Detection Delay: 100 to 400 ms
Loop Capacity: Up to 25 addressable devices between adjacent isolators
Terminal Wire Capacity: 2.5 mm² maximum with plug-in terminal connectors
Status Indicators: Tri-colour LED and address rotary switches mechanically visible in 2 planes
Mounting Options: Surface mounting with M200E-SMB box or DIN rail mounting with M200E-DIN clip
Operating Temperature: -20 °C to +60 °C
Operating Humidity: 0% to 95% RH (non-condensing)
System Compatibility: Morley-IAS and Honeywell intelligent analogue addressable fire alarm control panels
Standards & Compliance: EN 54-17:2005 (CPR 0786-CPR-21643), VdS G202142, GEA GEI 1-082, CEA GEI 1-084

KTI07001001FLIS

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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 MI/DISO addressable isolator module protects intelligent fire alarm signaling line circuits from system-wide failure caused by localized wire-to-wire short circuits. Placed strategically between groups of sensors and addressable field devices, it provides continuous electrical monitoring of loop conditions while maintaining uninterrupted communication across unaffected loop segments.
Engineered for high-reliability loop circuits, the module operates across a 15 to 30 V DC voltage range with a minimal standby current draw of 200 µA at 24 V DC. When a short circuit occurs, the module exhibits a fast fault detection delay between 100 and 400 ms, with an ultra-low series on-resistance of 0.065 Ω at 15 V DC to minimize circuit voltage drop under normal operating conditions.
Built on the System Sensor and Morley-IAS Series 200 mechanical platform, the module features plug-in wiring terminal connectors accepting conductors up to 2.5 mm². This modular architecture allows quick pre-wiring, rapid field installation, and immediate swap-out maintenance without disturbing field terminal screw connections.
Visual diagnostics are optimized with rotary address selector switches and a tri-colour LED indicator visible across two orthogonal planes. Technicians can view system status and verify address configuration directly through the transparent or viewing elements without disassembling the M200E-SMB surface enclosure.
The unit supports standard architectural segmenting of up to 25 addressable devices between adjacent isolators on Morley-IAS and Honeywell intelligent analogue addressable fire alarm control panels, including the DXc series. When the short-circuit condition is cleared, the module automatically resets and reconnects power and polling data to the isolated zone.
The MI/DISO module complies with European standard EN 54-17:2005 for short-circuit isolators under Construction Products Regulation certification 0786-CPR-21643, alongside VdS approval G202142 and compliance with CEA GEI 1-084 and GEA GEI 1-082 guidelines.

Product Information .

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

Control Panel, Loop Device, and Mechanical Mounting Compatibility

Analogue Addressable Fire Alarm Panel Compatibility

The Honeywell Morley-IAS MI/DISO fault isolator module is engineered for integration with Honeywell and Morley-IAS intelligent analogue addressable fire alarm control panels, including the Morley-IAS DXc series panels. The module integrates directly into the panel's analogue addressable signalling line circuit (SLC) to isolate short-circuit conditions automatically without requiring dedicated control programming from the panel.

Signalling Line Circuit Device Capacities and Topology

When engineering loop distribution, the MI/DISO is installed between groups of addressable field units to segment the transmission path. System engineering rules stipulate that each isolated loop segment can accommodate a maximum of 25 addressable devices (such as sensors, detectors, and modules) situated between two adjacent isolator modules. In the event of a wire-to-wire short circuit, the two flanking isolator modules detect the voltage drop, open their solid-state electronic switches within 100 to 400 ms, and disconnect the compromised segment. Once the fault is cleared and the line voltage returns above the operational threshold, the isolator modules automatically reset and restore loop communication and power.

Mechanical Mounting and Enclosure Ecosystem Compatibility

The MI/DISO is constructed on the standard 200 Series module mechanical platform, making it fully compatible with several standardized industrial and commercial mounting arrangements:

Surface Wall Mounting: Integrates directly into the M200E-SMB surface mounting enclosure. The enclosure design allows viewing of the multi-colour/tri-colour status LED and mechanical rotary address switches in two planes without requiring removal of the enclosure cover.
DIN Rail Mounting: Compatible with the M200E-DIN mounting clip for standard industrial DIN rail installation within power distribution enclosures and custom low-voltage control cabinets.
Connector Compatibility: Features removable plug-in wiring terminal blocks designed to simplify pre-wiring and hardware swap-outs without disconnecting individual terminal leads.

Electrical Specifications and Wiring Compatibility

Parameter	Specification / Rating
Loop Operating Voltage	15 to 30 V DC (peak)
Maximum Standby Current	200 µA at 24 V DC
Maximum On-Resistance	0.065 Ω at 15 V DC
Fault Detection Delay	100 to 400 ms
Maximum Conductor Size	2.5 mm² terminal wire cross-section
Operating Temperature Range	-20 °C to +60 °C
Operating Humidity Range	0% to 95% RH (non-condensing)

Standards and Regulatory Compliance

The MI/DISO conforms to European fire protection standard EN 54-17:2005 for short-circuit isolators under Construction Products Regulation certification 0786-CPR-21643. It carries VdS approval G202142 and meets the testing specifications of GEA GEI 1-082 and CEA GEI 1-084, validating compatibility with regulated commercial and industrial fire alarm installations across standard 15 to 30 V DC loop topologies.

Honeywell MI/DISO M200E-SMB Addressable Isolator Module Installation & Mounting Guide

The Honeywell MI/DISO addressable loop short-circuit fault isolator module, paired with the M200E-SMB surface mounting enclosure, is engineered to safeguard Honeywell and Morley-IAS intelligent analogue addressable fire alarm systems against wire-to-wire short circuits. Proper physical mounting and strategic electrical placement ensure the signalling line circuit (SLC) continues operating without system collapse during line faults.

Mechanical Mounting & Enclosure Options

The MI/DISO module features a compact mechanical footprint measuring 93 mm (H) x 94 mm (W) x 23 mm (D) with a bare module weight of 62 g. It is part of the standardized 200 Series mechanical platform, offering dual mounting choices depending on installation requirements:

Surface Mounting: Mount the unit directly using the supplied M200E-SMB surface mounting box. The enclosure design allows status LEDs and rotary address switches to be visually inspected in two planes without removing the protective front cover.
DIN Rail Mounting: Install the module onto standard 35 mm DIN rails using an optional M200E-DIN mounting clip, accommodating high-density cabinet layouts within central control equipment.

Regardless of the chosen mounting method, address selector switches remain fully accessible and visible from two distinct planes, enabling rapid configuration prior to and following installation.

Field Wiring & Plug-In Terminal Connections

The MI/DISO utilizes removable plug-in wiring terminal connectors designed to accelerate field termination and simplify servicing. Field wiring can be pre-terminated to the connector blocks prior to seating the module, and units can be swapped out without unwiring conductors.

Maximum Conductor Gauge: Accepts solid or stranded field wire up to 2.5 mm² maximum per terminal.
Polarity & Contact Integrity: Ensure conductors are fully stripped and seated securely into the plug-in terminal blocks to maintain a low line on-resistance (maximum 0.065 Ω at 15 V DC).

Loop Placement & Segmentation Rules

Fault isolator modules should be positioned strategically across the analogue addressable loop between groups of detectors, call points, and control modules. Installers must adhere to the following segment parameters:

Maximum Device Capacity: Each isolator module segment can support up to 25 addressable devices maximum between adjacent isolator units.
Autonomous Fault Segregation: In the event of a wire-to-wire short circuit, the two isolators positioned immediately adjacent to the faulted section detect the line voltage drop within 100 to 400 ms. They automatically open internal electronic switches to isolate the damaged segment while keeping the remaining loop operational.
Automatic Line Restoration: When the short-circuit condition is resolved and loop voltage rises above the operational line threshold, the module automatically closes its internal contacts and restores power and communications to the isolated section.

Commissioning Diagnostics & Operational Verification

Address selection is completed via the integrated rotary address switches. Operational verification is provided locally via the multi-colour / tri-colour diagnostic LED visible through the M200E-SMB enclosure window:

Normal Standby State: The LED blinks periodically to indicate active communication polling from the fire alarm control panel.
Active Isolation / Fault State: The LED illuminates steady upon detecting a short-circuit fault to clearly highlight the activated isolator segment.

Environmental & Installation Specifications

Parameter	Specification
Operating Voltage	15 to 30 V DC (peak)
Maximum Standby Current	200 µA at 24 V DC
Fault Detection Delay	100 to 400 ms
Maximum On-Resistance	0.065 Ω at 15 V DC
Maximum Terminal Wire Size	2.5 mm²
Operating Temperature Range	-20 °C to +60 °C
Operating Humidity Range	0% to 95% RH (non-condensing)
Maximum Devices Per Segment	25 addressable units
Module Dimensions (H x W x D)	93 mm x 94 mm x 23 mm
Bare Module Weight	62 g

Honeywell MI/DISO Loop Isolator Module Fault Isolation and Diagnostic Guide

The Honeywell MI/DISO addressable short-circuit isolator module is engineered to protect intelligent analogue addressable fire alarm loops against complete circuit collapse caused by wire-to-wire short circuits. When integrated with Morley-IAS or Honeywell fire alarm control panels, the module continuously monitors the signalling line circuit. Commissioning engineers and maintenance technicians can isolate installation faults and circuit anomalies using the diagnostic procedures outlined below.

Interpreting the Tri-Colour Status LED

The MI/DISO is equipped with a tri-colour diagnostic LED that provides mechanical visibility across two planes. Diagnostic observation does not require removing the cover of the M200E-SMB surface mounting box.

Blinking LED: Indicates normal standby polling operation from the intelligent fire alarm control panel across the 15 to 30 V DC operational loop voltage.
Steady Continuous LED: Indicates active fault isolation. The module has detected a loop fault or short-circuit condition and has opened its internal electronic switches to isolate the adjacent wiring segment.
Extinguished LED: Indicates complete absence of loop voltage (below the 15 V DC threshold), improper seating of the plug-in wiring terminal block, or reversed loop polarity.

Investigating Loop Short Circuits and Segment Isolation

When a wire-to-wire short circuit occurs on the addressable circuit, the loop voltage drops sharply. The two MI/DISO isolator modules situated immediately upstream and downstream of the fault detect this drop within an operating delay of 100 to 400 ms. Both units open their electronic switches simultaneously, isolating the damaged conductor segment while maintaining normal communication to the rest of the loop.

To locate and clear the fault:

Inspect the loop topology to identify the two isolators displaying steady LED illumination. The short circuit is physically located in the loop wiring between these two units.
Verify that no more than the design limit of 25 addressable devices is installed between the two isolator modules. Exceeding 25 items per isolated segment can degrade isolation performance and voltage stability.
Disconnect field wiring from the plug-in terminal connectors to test individual conductor pairs with a multimeter for direct wire-to-wire shorts or terminal cross-connections.

Resolving Auto-Restoration and Voltage Threshold Failures

The MI/DISO features an automatic reset mechanism. Once the short-circuit condition is physically cleared and the loop line voltage recovers above the internal fixed operational threshold, the isolator switches close automatically, restoring signalling and power to the isolated segment.

If the isolator remains latched in an open state (steady LED illuminated):

Confirm that the line voltage supplied by the panel loop driver is sustained between 15 and 30 V DC (peak).
Check for persistent high-resistance shorts or parasitic loads that keep circuit voltage below the restoration threshold. The module introduces a maximum on-resistance of only 0.065 Ω at 15 V DC under normal closed conditions.
Verify that standby current draw does not exceed 200 µA at 24 V DC per module during quiescent states. Excessive standby loading suggests damaged loop components in the segment.

Verifying Wiring Terminations and Mechanical Settings

Wiring and addressing configuration errors should be validated during commissioning or replacement:

Plug-in Terminal Blocks: Ensure conductors do not exceed the maximum allowable wire cross-section of 2.5 mm². Loose or de-wired conductors within the plug-in connector will disrupt downstream communication.
Address Rotary Switches: Ensure the address selector switches—which are visible and accessible across two planes regardless of surface mounting or DIN-rail installation—are correctly aligned to the panel configuration map.
Operating Environment: Confirm the installation site remains within the specified temperature limits of -20 °C to +60 °C and within 0% to 95% relative humidity (non-condensing) to avoid condensation-related impedance faults across terminal points.

Engineering Applications & Loop Segmentation Scenarios

Signalling Line Circuit (SLC) Zonal Segmentation in Intelligent Fire Networks

The Honeywell MI/DISO addressable loop isolator module, paired with the M200E-SMB surface mounting enclosure, serves as a critical line-protection component within analogue addressable fire alarm installations. In large commercial facilities, healthcare campuses, and industrial plants, signalling line circuits are exposed to physical mechanical damage, loose terminations, or wire-to-wire short circuits. Installed along the SLC loops of Morley-IAS and Honeywell intelligent fire alarm control panels (including the DXc series), the MI/DISO actively monitors line voltage across a 15 to 30 V DC range. If a short circuit occurs, the module identifies the voltage collapse within a fault detection delay of 100 to 400 ms and opens internal electronic switches, isolating the affected loop section while allowing the remainder of the loop to maintain communication.

Sub-Zonal Branch Protection and EN 54-17 Compliance

In life safety network architectures designed to meet European standard EN 54-17:2005 (certified under 0786-CPR-21643, VdS G202142, GEA GEI 1-082, and CEA GEI 1-084), fire alarm loops must be partitioned to prevent a single wiring fault from disabling an entire floor or critical process area. The MI/DISO module supports configurations protecting up to 25 addressable field devices—such as optical smoke detectors, thermal sensors, and input/output interfaces—between adjacent isolators. Placing an MI/DISO module at the boundary of each floor zone, tenant sub-lease, or riser shaft prevents line disturbances in one area from collapsing the detection infrastructure of adjacent structural zones.

Control Panel Enclosure and Field Junction Box Integration

The mechanical flexibility of the MI/DISO platform allows it to be deployed across both centralized electrical enclosures and distributed field locations. For centralized control cabinets or sub-panels, the module can be snapped onto a standard DIN rail using an M200E-DIN mounting clip. For field deployment across utility basements, mechanical plant rooms, and corridor ceiling spaces, the unit integrates into the M200E-SMB surface mounting enclosure. The module occupies a compact profile of 93 mm (H) x 94 mm (W) x 23 mm (D) with a net weight of 62 g. Field terminations accommodate wire sizes up to 2.5 mm² via plug-in wiring terminal connectors, which permit rapid circuit testing, commissioning, and module replacement without requiring the disconnection of individual field wires.

Autonomous Fault Restoration and In-Service Maintenance Triage

To reduce system downtime and streamline facility maintenance in 24/7 industrial and commercial operations, the MI/DISO provides autonomous line recovery. When service technicians rectify the wire-to-wire short circuit and the loop voltage rises above the fixed operational threshold, the isolator module automatically restores loop power and communications to the isolated section without requiring manual resetting at the panel. Local maintenance teams can verify module status using the integrated tri-colour LED indicator and inspect rotary address switches visible across two planes through the M200E-SMB enclosure cover. The indicator LED blinks during regular panel polling and illuminates steady when an active fault condition is detected.

Application Engineering Parameters

Engineering Parameter	Specification / Application Limit
Maximum Devices per Segment	Up to 25 addressable devices between adjacent isolators
Fault Isolation Response Time	100 to 400 ms fault detection delay
Loop Operating Voltage Range	15 to 30 V DC (peak)
Standby Current Consumption	200 µA maximum at 24 V DC
Maximum In-Line On-Resistance	0.065 Ω at 15 V DC
Supported Cable Cross-Section	Up to 2.5 mm² via plug-in connectors
Operating Temperature Range	-20 °C to +60 °C
Operating Humidity Range	0% to 95% RH (non-condensing)
Applicable Standards	EN 54-17:2005, GEA GEI 1-082, CEA GEI 1-084

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