Product Overview

The Honeywell NOTIFIER LCM-320 is a Loop Control Module used in ONYX Series intelligent fire alarm control panels. It adds Signaling Line Circuit (SLC) capacity to compatible fire alarm systems, allowing additional addressable detectors and control devices to communicate with the main control panel.

The LCM-320 is primarily used with the NFS-3030 and NFS2-3030 fire alarm control panels. These systems support up to five LCM-320 modules, providing multiple independent SLC loops for installations requiring extensive addressable device coverage.

Each LCM-320 provides one SLC loop and can be paired with a LEM-320 Loop Expander Module to provide an additional loop. This modular arrangement allows engineers to expand the detection network according to the number of field devices and the layout of the protected facility.

The module supports NOTIFIER FlashScan and CLIP addressable communication protocols, depending on the connected panel and device configuration. It can accommodate addressable smoke detectors, heat detectors, monitor modules, and control modules on the associated signaling circuit.

A notable feature is its built-in degraded-mode operation, which helps maintain system functionality under specified fault conditions. The plug-in installation arrangement also simplifies integration into the designated ONYX fire alarm control panel chassis.

For large buildings and industrial facilities, the LCM-320 provides a practical way to increase addressable detection capacity while retaining the existing ONYX control panel architecture.

Technical Specifications

Product Features

• SLC Loop Expansion: Adds an additional Signaling Line Circuit to compatible ONYX fire alarm control panels.
• Multiple Module Support: Supports up to five LCM-320 modules in NFS-3030 and NFS2-3030 configurations.
• LEM-320 Expansion Compatibility: Each LCM-320 can be expanded with an associated LEM-320 to provide another SLC loop.
• 24 V DC Operation: Operates at a nominal voltage of 24 V DC, with a maximum operating voltage of 27.6 V DC.
• FlashScan and CLIP Support: Accommodates compatible NOTIFIER addressable communication protocols.
• High Device Capacity: Supports up to 159 detectors and 159 modules per SLC loop.
• Long-Distance Communication: Supports Class B SLC wiring distances up to 12,500 feet with 12 AWG cable.
• Built-In Degraded Mode: Provides additional system survivability under specified operating conditions.
• Plug-In Installation: Uses a direct mounting arrangement within the designated ONYX chassis.
• Fire Alarm System Approvals: The product documentation identifies UL, ULC, FM, CSFM, and other regional approvals.

Product Working Principle

The LCM-320 operates as an addressable communication interface between the ONYX fire alarm control panel and the field devices connected to its SLC loop.

After installation, the module establishes the signaling circuit through which the control panel communicates with addressable detectors and modules. Each connected device has an assigned address, allowing the panel to identify the source of incoming signals.

During normal operation, the control panel supervises the SLC and exchanges communication with connected devices. Smoke detectors and heat detectors transmit alarm-related information, while monitor modules report the status of external initiating circuits.

Control modules receive commands from the fire alarm panel and operate designated external equipment, such as notification appliances or fire protection interfaces.

A simplified signal arrangement is:

NOTIFIER Fire Alarm Control Panel → LCM-320 → SLC Wiring → Addressable Detectors and Modules

The LCM-320 supports both FlashScan and CLIP communication protocols, subject to the control panel and connected device configuration.

For NFS-3030 and NFS2-3030 installations, multiple LCM-320 modules can be connected through the panel’s internal module communication arrangement. This allows separate SLC loops to serve different areas of a facility.

When an associated LEM-320 is installed, an additional signaling loop can be provided for the corresponding LCM-320 configuration.

The built-in degraded-mode function helps maintain system survivability when specified communication or control conditions are compromised. However, the module does not replace the main fire alarm control panel or independently perform the complete fire alarm processing function.

Role in Honeywell NOTIFIER ONYX Control Architecture

Within the ONYX fire alarm architecture, the LCM-320 acts as an additional SLC controller. It extends the addressable communication network beyond the capacity of the main control panel’s onboard circuits.

The NFS-3030 and NFS2-3030 support up to five LCM-320 modules and five corresponding LEM-320 expansion modules. This arrangement allows the fire alarm network to be divided into multiple loops according to building areas, device distribution, and wiring requirements.

A typical system arrangement is:

ONYX Fire Alarm Control Panel → LCM-320 → LEM-320 (Optional) → SLC Field Devices

Industrial Applications

The LCM-320 is suitable for addressable fire alarm systems requiring additional signaling circuits and greater field device capacity.

Installation and Maintenance

1. Verify Panel Compatibility: Confirm that the installed fire alarm control panel is an NFS-3030 or NFS2-3030 configured to support the LCM-320.
2. Inspect the Module: Check the circuit board, connector contacts, and mounting points for visible damage before installation.
3. Plan Loop Configuration: Determine the number of SLC loops required and whether an additional LEM-320 will be installed.
4. Isolate the Fire Alarm Panel: Follow the manufacturer’s maintenance procedures and applicable fire protection requirements before working inside the control panel.
5. Prepare the Mounting Position: Identify the designated module position within the ONYX chassis.
6. Install the Module: Insert the LCM-320 into the specified mounting position and verify that its plug-in connections are fully engaged.
7. Connect Module Communication: For multiple LCM-320 installations, connect the module communication ribbon cables according to the panel wiring arrangement.
8. Prepare SLC Wiring: Select the appropriate twisted-pair cable and verify that the conductor gauge supports the intended loop distance.
9. Check Circuit Resistance: Confirm that the SLC wiring resistance remains within the specified 50 Ω maximum limit.
10. Configure Addressable Devices: Assign and verify the addresses of connected detectors, monitor modules, and control modules.
11. Perform Loop Testing: Restore the system according to the commissioning procedure and verify device communication, alarm reporting, and fault supervision.
12. Complete Routine Inspection: Check module seating, ribbon cable connections, SLC terminals, wiring insulation, and communication status during scheduled maintenance.

If an entire SLC loop becomes unavailable, inspect the module connection, communication ribbon cable, and field wiring before troubleshooting individual detectors. Also check for short circuits, excessive loop resistance, and incorrect device addressing.

Because the LCM-320 is part of a life-safety system, installation and commissioning should be performed by qualified fire alarm technicians in accordance with the applicable NOTIFIER documentation and local fire protection regulations.

Compatible System Components

Recommended Related Models

Key Advantages

• Adds SLC capacity to compatible ONYX fire alarm panels.
• Supports up to five LCM-320 modules in NFS-3030/NFS2-3030 systems.
• Supports expansion through the LEM-320.
• Accommodates FlashScan and CLIP addressable devices.
• Supports up to 159 detectors and 159 modules per loop.
• Provides long-distance SLC wiring capability.
• Incorporates built-in degraded-mode operation.
• Uses a plug-in mounting arrangement.

Technical FAQs

1. What is the difference between the LCM-320 and LEM-320?

The LCM-320 is the Loop Control Module that adds an SLC to the ONYX control panel. The LEM-320 is an expansion module that provides an additional SLC when paired with an LCM-320. They perform different functions and are not interchangeable.

2. How many LCM-320 modules can an NFS2-3030 support?

An NFS2-3030 can support up to five LCM-320 modules and five LEM-320 modules. Each LCM-320 can be paired with an associated LEM-320 to provide an additional signaling loop.

3. How many addressable devices can be connected to one LCM-320 loop?

The documented configuration supports up to 159 detectors and 159 addressable modules per SLC loop. The actual device arrangement must also comply with the selected communication protocol and control panel configuration.

4. What happens if an SLC loop connected to the LCM-320 develops a short circuit?

The affected loop shuts down while the short-circuit condition remains present. The wiring fault must be located and corrected before normal loop operation can resume. The panel should then be checked to confirm that all connected addressable devices communicate correctly.