The Honeywell 2MLL-EFMF/A is a FEnet (Fast Ethernet) module designed for the MasterLogic PLC series. This module uses fiber optic media to achieve a transmission speed of 100 Mbps. It operates over a maximum distance of 2 kilometers between nodes. The SC type fiber connector supports multi-mode fiber with a core size of 62.5/125um.
Furthermore, the 2MLL-EFMF/A supports multiple industrial protocols. These include HSL for peer-to-peer communication between MasterLogic PLCs. It also works as a Modbus TCP slave device. The P2P function allows the module to act as a Modbus TCP master or a user-defined protocol master. This flexibility makes it suitable for complex automation networks.
Ethernet and Physical Layer
FEnet: Fast Ethernet, 100/100Mbps, SC Type (Fiber Optic)
Ethernet Standard: IEEE802.3U
Protocols: TCP-IP, UDP-IP
Network Control Protocol (Access Method): CSMA/CD
Transmission Method: Baseband
Transmission Speed: 100 Mbps
Physical Layer: 100baseFx (Fiber-Optic)
Media: 62.5/125um, Multi-mode, SC connector
Transmission Distance: 2Km (Switch/Node , Fiber Optic)
Maximum Number of Nodes: 64
Software and Firewall Features
Software Firewall: IP address settings in SoftMaster-NM
Public Network Access: DNS server and Gateway IP address setting
Dynamic IP address for ADSL: DHCP protocol
Configuration Software: SoftMaster-NM
Supported Services and Protocols
HSL: Peer-to-Peer High Speed Link with other MasterLogic PLCs
HSL Send/Receive blocks: 200 words / block, (Max. 128 blocks)
MLDP: Experion Interface – MasterLogic Dedicated Protocol
Modbus TCP slave: MODBUS TCP slave protocol
P2P: MODBUS TCP master, User defined Protocol master
SoftMaster I/F: Supported
LED Indicators and Diagnostics
LEDs: RUN, I/F, HS, P2P, PADT, PC, ERR, TX, RX, 10/100
Network Diagnostics: Auto-scan, Ping Test, Frame Monitor, Link Monitor
Electrical and Physical Data
Current Consumption: 630 mA
Weight: 120g
The Honeywell 2MLL-EFMF/A uses a Highway topology with baseband transmission. This means all nodes share a single communication channel. The CSMA/CD access method manages data flow efficiently. For public network access, you can configure DNS server and gateway IP addresses. The module also supports DHCP protocol for dynamic IP assignment from an ADSL connection.
You can set up IP address filtering directly in SoftMaster-NM software. This acts as a basic software firewall. It restricts which remote devices can communicate with the module. Such a feature enhances network security in industrial environments.
The HSL service is a key advantage of the 2MLL-EFMF/A. It allows direct high-speed data exchange between multiple MasterLogic PLCs. Each HSL block can transfer up to 200 words of data. You can configure a maximum of 128 blocks per module. This capability is ideal for applications that require coordinated control across several machines or production lines.
For instance, you can link three MasterLogic PLCs on the same fiber optic network. One PLC reads production counters from the others via HSL. It then aggregates the data for a central SCADA system. Meanwhile, each PLC retains its local control tasks without interruption.
The 2MLL-EFMF/A operates as a Modbus TCP slave device. This allows any Modbus TCP master (such as an HMI or SCADA) to read from and write to the PLC’s internal registers. The implementation follows the standard Modbus TCP protocol over port 502.
Additionally, the P2P function turns the module into a Modbus TCP master or a user-defined protocol master. As a master, it can poll data from multiple slave devices on the Ethernet network. The user-defined protocol feature gives you the freedom to communicate with non-standard devices. You only need to define the frame structure in SoftMaster-NM.
Ten LED indicators provide real-time status of the Honeywell 2MLL-EFMF/A. Here is what each LED means:
RUN: Module is powered and operational.
I/F: Interface activity status.
HS: HSL link is active.
P2P: Peer-to-peer function is running.
PADT: Connection to programming software.
PC: Communication with the host PLC backplane.
ERR: Hardware or configuration error detected.
TX: Transmitting data on the fiber port.
RX: Receiving data on the fiber port.
10/100: Indicates 100Mbps link speed (on for 100Mbps, off for 10Mbps).
When troubleshooting, first check that the RUN LED is steady on. If the ERR LED blinks, use the network diagnostics tools in SoftMaster-NM. The auto-scan function discovers all nodes on the network. The ping test verifies connectivity to a specific IP address. The frame monitor and link monitor help identify traffic congestion or physical layer problems.
1. Can the Honeywell 2MLL-EFMF/A work with single-mode fiber?
No, this module is designed for multi-mode fiber only. The specification requires 62.5/125um multi-mode fiber with SC connectors. Using single-mode fiber may cause signal loss or communication failure.
2. How many HSL blocks can I configure on this module?
You can configure up to 128 HSL blocks. Each block transfers up to 200 words of data. This gives you a total data exchange capacity of 25,600 words across all blocks.
3. Does the 2MLL-EFMF/A support Ethernet/IP protocol?
No, the supported protocols are HSL, MLDP, Modbus TCP slave, and P2P (Modbus TCP master or user-defined). It does not support Ethernet/IP or Profinet.
4. What software do I need to configure this module?
You need SoftMaster-NM configuration software. This is the standard programming and configuration tool for the MasterLogic PLC series. Use it to set IP addresses, firewall rules, and protocol parameters.
5. The ERR LED is blinking. How do I fix it?
First, run the auto-scan diagnostic in SoftMaster-NM. Then perform a ping test to check basic network connectivity. Next, verify that the IP address is unique on your network. Also check that the fiber cable is not bent beyond its minimum bend radius. If the problem persists, power cycle the PLC rack.
| Brand Name | Honeywell |
| Model No. | 2MLL-EFMF/A |
| Product Type | Communication Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
