Honeywell 2MLL-EFMF/A Fast Ethernet Fiber Optic Module for MasterLogic PLCs

Product Overview

When industrial networks demand high-speed, noise-immune communication over long distances, the Honeywell 2MLL-EFMF/A Fast Ethernet fiber optic module provides a robust solution. Designed for MasterLogic PLC systems, this module delivers deterministic peer-to-peer data exchange and seamless integration with Experion DCS environments. As part of Honeywell's proven automation portfolio, the 2MLL-EFMF/A enables reliable fiber optic links up to 2 kilometers, making it ideal for distributed plant floors and harsh electrical environments.

Technical Specifications

The 2MLL-EFMF/A operates at 100 Mbps using the 100BaseFx physical layer standard (IEEE 802.3u). It employs a multi-mode fiber optic interface with a 62.5/125um core and SC connector type. The module supports up to 64 nodes on a baseband transmission topology using CSMA/CD access method. Key protocols include HSL (peer-to-peer high-speed link), MLDP (Experion interface), Modbus TCP slave, and P2P (Modbus TCP master and user-defined protocol master). Configuration is performed via SoftMaster-NM software, which includes IP address settings, firewall configuration, DNS and gateway addressing, and DHCP support for dynamic IP assignment. The module consumes 630 mA of current and weighs 120 grams. Front panel LEDs indicate RUN, I/F, HS, P2P, PADT, PC, ERR, TX, RX, and 10/100 status. Built-in network diagnostics include auto-scan, ping test, frame monitor, and link monitor.

Industry Applications

In large-scale manufacturing plants, the 2MLL-EFMF/A enables high-speed data exchange between multiple MasterLogic PLCs over fiber optic backbones, eliminating ground loop issues and electromagnetic interference common in copper networks. For oil and gas facilities, the module's support for MLDP protocol allows direct integration with Honeywell Experion distributed control systems, streamlining data flow from field controllers to the central control room. In water treatment and power generation applications, the fiber optic transmission distance of up to 2 kilometers makes it possible to connect remote pumping stations or substations without signal degradation.

Installation and Setup Guidance

When installing the 2MLL-EFMF/A, ensure the SC-type fiber optic connector is clean and properly seated. Use multi-mode fiber with 62.5/125um core diameter for optimal performance. Configure the module using SoftMaster-NM software: set the IP address, subnet mask, and gateway as required by your network architecture. For public network access, enable DNS server and gateway IP address settings. If using ADSL, activate the DHCP protocol for dynamic IP assignment. The module supports up to 128 HSL send/receive blocks of 200 words each, so plan your data mapping accordingly. After installation, use the auto-scan and ping test diagnostics to verify network connectivity.

Maintenance and Reliability

The 2MLL-EFMF/A requires minimal maintenance due to its fiber optic design, which is immune to electrical noise and corrosion. Periodically inspect the SC connectors for dust or damage and clean them with appropriate fiber optic cleaning tools. Monitor the front panel LEDs: the ERR LED indicates network errors, while TX and RX confirm active data transmission. Regular use of the link monitor diagnostic tool helps detect early signs of fiber degradation or node failures. Following these practices extends the module's service life and maintains network reliability.

Compatibility and Integration

The 2MLL-EFMF/A integrates seamlessly with Honeywell MasterLogic PLCs via the HSL protocol for peer-to-peer high-speed links. It also supports Modbus TCP slave for connection to SCADA systems or third-party controllers, and MLDP for direct Experion DCS interface. The module can function as a Modbus TCP master or user-defined protocol master, enabling flexible communication with various field devices. Configuration is handled exclusively through SoftMaster-NM software, which provides a unified environment for network setup and diagnostics.

Selection Guide and Purchasing Advice

Before purchasing the 2MLL-EFMF/A, verify that your existing network infrastructure supports multi-mode fiber with SC connectors and 62.5/125um cable. Confirm that your MasterLogic PLC has an available slot for the module and that your SoftMaster-NM software version is compatible. BluePLC Industrial stocks the Honeywell 2MLL-EFMF/A and can provide current availability and lifecycle status. Contact our team for assistance with system compatibility or to request a quotation for volume orders.