The Honeywell Morley-IAS 795-072-100 loop driver card is an analogue addressable plug-in daughterboard engineered specifically to provide communication and drive current for Morley-IAS protocol field devices. When integrating this module into industrial and commercial fire detection networks, compatibility across control panel hardware, protocol rules, field devices, and loop wiring parameters must be strictly aligned with manufacturer engineering criteria.
Control Panel Hardware Compatibility
The 795-072-100 module is designed for direct plug-in mounting onto designated loop driver pin headers inside Honeywell Morley-IAS intelligent multi-protocol fire alarm control panels. It is compatible with both the ZX series and the ZXSe series platforms:
- Morley-IAS ZX1Se: Supports a single loop driver card, accommodating 1 detection loop with a maximum drive current of 460 mA.
- Morley-IAS ZX2Se: Accommodates 1 or 2 loop driver cards, enabling up to 2 individual detection loops at up to 460 mA per loop.
- Morley-IAS ZX5Se: Scales from 1 to 5 loop driver cards, providing up to 5 individual detection loops at up to 460 mA per loop.
- Morley-IAS ZX Series: Fully backward-compatible with legacy ZX series multi-protocol chassis accepting internal plug-in loop driver boards.
Protocol Assignment Rules
The ZXSe and ZX series architectures support multiple industry protocols (including Morley-IAS, Apollo, Hochiki ESP, and System Sensor). However, strict protocol isolation rules govern hardware deployment:
- Single Chassis Homogeneity: Multiple sensor protocols cannot be operated simultaneously within the same panel enclosure. All loop driver cards installed within a single ZXSe or ZX chassis must communicate using the exact same device protocol. Therefore, if the 795-072-100 is deployed, every installed loop card in that specific panel enclosure must run the Morley-IAS protocol.
- Networked Protocol Independence: While an individual panel cannot mix protocols across its internal loops, distinct control panels connected across a multi-panel network can run differing protocols independently without communication conflict.
Field Device Compatibility and Loop Addressing Limits
Each 795-072-100 loop driver card provides an addressable line capacity of up to 198 individual address points, structured into two dedicated address bands:
- Up to 99 analogue addressable detector and sensor addresses.
- Up to 99 addressable module addresses (such as monitor modules, control modules, isolator modules, and conventional zone interface modules).
The card permits mixed device topologies on a common signaling circuit, driving optical smoke detectors, thermal heat sensors, interface units, and loop-powered indicators on the same physical loop line. Onboard double address detection automatically identifies duplicate device addresses during commissioning to protect loop data integrity.
Circuit Architecture and Electrical Wiring Limits
To maintain signal integrity and meet compliance with EN 54-2 and EN 54-4 standards, field wiring connected to the 795-072-100 driver must adhere to the following electrical and topological constraints:
| Parameter | Specification / Compatibility Limit |
|---|---|
| Loop Wiring Topology | Class A (closed return loop) or Class B (open spur) configurations |
| Nominal Loop Voltage | 24 V DC |
| Maximum Continuous Loop Drive Current | 460 mA per loop (nominal 440 mA continuous) |
| Card Quiescent Consumption | 20 mA (excluding connected field devices) |
| Maximum Loop Wiring Resistance | 40 Ohms maximum |
| Maximum Loop Wiring Capacitance | 0.5 µF maximum |
Prior to applying main or standby battery power (batteries are not included), the loop voltage jumper on the panel/card interface must be set to the correct operating position for the installed 795-072-100 driver card to ensure correct electrical regulation across connected Morley-IAS devices.
