Honeywell 2MLL-EFMT 10/100Mbps PLC Communication Card

Product Overview

The Honeywell 2MLL-EFMT operates as a high-speed, industrial-grade Fast Ethernet communication module designed for the MasterLogic-200 programmable logic controller (PLC) platform. This module establishes a high-bandwidth data gateway between the main PLC processor rack and external plant infrastructure, including supervisory control and data acquisition (SCADA) systems, human-machine interfaces (HMIs), and distributed field devices. Plant engineers integrate this card into standard control slots to enable rapid, deterministic data exchange across factory networks without encountering data transmission bottlenecks.

Technical Specifications

Engineering Advantages

Auto-Negotiation Logic Simplifies Network Upgrades

The 2MLL-EFMT embeds an intelligent auto-negotiation sensing engine that matches the transmission speed (10 Mbps or 100 Mbps) and duplex mode of connected network switches automatically. This capability removes the requirement for manual dip-switch configuration or software overriding during field installation. When plant operators swap an old 10 Base-T hub for a modern Fast Ethernet switch, the module scales its data throughput capacity instantly, maintaining continuous communication links without human intervention.

Multi-Protocol Stack Bridges Factory Floors and Enterprise ERPs

The communication firmware executes concurrent TCP/IP and UDP/IP network layer processing directly on the module hardware, removing communication loads from the main PLC CPU. This dual-protocol capability allows the 2MLL-EFMT to handle deterministic time-critical I/O message bursts via UDP while managing standard recipe downloads, diagnostics, and data logs via stable TCP channels. The module transfers field data directly to supervisory SCADA software and corporate ERP tracking loops over a single unified network backbone.

Shielded STP Integration Cancels Severe Electromagnetic Noise

The RJ-45 physical interface connects directly with both standard unshielded twisted pair (UTP) and heavy-duty shielded twisted pair (STP) Category 5 cabling. In environments with heavy electrical noise—such as near motor control centers (MCCs) or high-voltage switchgear panels—the grounded metal shell of the module port terminates cable shields directly to the chassis frame. This path vents high-frequency electromagnetic interference (EMI) and radio-frequency noise safely away from the data lines, preserving message data packets over the full 100-meter line length.

FAQs

• Which specific network diagnostics can an engineer track via the 2MLL-EFMT module faceplate?

  The module faceplate contains an integrated array of clear LED indicators that display real-time physical link status, active network traffic transmission (Tx/Rx), and internal module health states. Technicians can use these indicators to isolate physical cabling breaks or broken link pulses immediately, without deploying dedicated external packet analysis tools.

• Does the module require an isolated external 24 VDC power supply connection for its network circuit?

  No. The 2MLL-EFMT draws its raw operating power through the standard MasterLogic-200 rack backplane connection. The internal circuit design filters and stabilizes this incoming backplane current to ensure the RJ-45 port maintains clean, isolated signaling levels across the plant grid.

• How many active peer-to-peer controller nodes can this module maintain on a single segment?

  The internal memory and packet tracking registers of the 2MLL-EFMT support simultaneous connections with up to 64 distinct network nodes. This deep connection pool enables a single MasterLogic-200 rack to synchronize data with multiple remote I/O blocks, neighboring PLCs, and central engineering stations over a single Ethernet trunk line.