System Compatibility and Loop Integration

Morley-IAS Control Panel and Loop Protocol Compatibility

The Morley-IAS MI-DMMI single-channel monitor module by Honeywell is engineered for direct integration with Morley-IAS intelligent addressable fire alarm control panels. Communicating across standard Morley-IAS loop protocols, the module allows facility engineers to report the status of external third-party initiation hardware directly into the central fire alarm system architecture.

Within the signalling line circuit (SLC) addressing scheme, the MI-DMMI requires a single address out of the ninety-nine available module addresses per loop. System address configuration is conducted directly on the unit using mechanical decade rotary selector switches. This allows technicians to address the module without requiring specialized electronic handheld programmer tools.

Compatible External Contact Devices

The MI-DMMI is configured to provide continuous supervision for a single circuit composed of normally open dry contact initiation equipment. The onboard circuitry actively distinguishes between normal supervisory conditions, open-circuit fault conditions, and active alarm states.

Initiation devices and plant equipment compatible with the MI-DMMI input circuit include:

• Waterflow detector switches on wet or dry pipe sprinkler installations
• Sprinkler supervisory valve tamper switches
• Industrial and mechanical pressure switches
• Auxiliary security monitoring contacts
• Manual contact units and standard normally open contact interfaces

Signalling Line Circuit (SLC) Electrical Compatibility

The MI-DMMI draws its operating power directly from the Morley-IAS addressable signalling loop. The module operates within an allowable voltage range of 15 to 30 Vdc. A minimum line voltage of 17.5 Vdc is required across the loop terminals to guarantee proper diagnostic LED operation.

For loop current capacity and power supply loading calculations, the MI-DMMI exhibits the following electrical load parameters at 24 Vdc:

• Maximum standby current without loop communication: 310 µA at 24 Vdc
• Maximum standby current with communication polling every 5 seconds (with LED blink enabled): 510 µA at 24 Vdc

The module includes built-in short circuit isolators located directly on the signalling line circuit, allowing the communication loop to maintain integrity during localized loop faults without requiring auxiliary isolator modules.

Mounting Hardware and Enclosure Compatibility

The physical unit measures 93 mm (H) x 94 mm (W) x 23 mm (D) with a total mass of 100 g. Field installation requires compatible Morley-IAS mounting hardware based on site installation requirements:

• Surface wall mounting requires an M200E-SMB or M220E/SMB surface mounting enclosure box.
• Standard industrial DIN rail installation requires the M200E-DIN rail mounting clip.

The module features plug-in wiring terminal blocks that simplify field wire termination, pre-commissioning testing, and routine maintenance. When installed in its designated surface box, the decade rotary address switches and the tri-colour LED status indicator (visible in two planes via front and profile light pipes) remain visible and accessible without disassembling the enclosure cover.

Integration and Compatibility Reference

Regulatory and System Standard Compliance

The MI-DMMI complies with European standards EN 54-17 for integrated short-circuit isolation and EN 54-18 for input/output fire alarm monitoring devices. The module also holds official equipment approvals under CEA GEI 1-084 and GEA GEI 1-082, ensuring standards-compliant implementation across commercial and industrial life safety installations.