Honeywell 2MLL-EFMT Fast Ethernet Modules

The Honeywell 2MLL-EFMT serves as the primary 2MLL-EFMT Fast Ethernet Module utilized to execute high-speed industrial network communication across MasterLogic-200 platforms.

Hardware Specifications

Distributed Process Integration and DCS Interface

• 4-20 mA HART Loop Protocol Transceiver Routing: The module coordinates raw packet routing between upstream supervisory Distributed Control Systems (DCS) and field-level intelligent instrumentation, supporting HART loop queries over Ethernet.
• Channel-to-Channel Electrical Isolation: Internal optocouplers deliver galvanic isolation between the input RJ-45 network interface and the internal PLC backplane power, protecting logical processors from common-mode voltage spikes up to 500 VAC.
• Cold Junction Compensation (CJC) Dynamic Scaling: Transmits linearized thermocouple data, including real-time CJC updates, from local rack nodes to host Experion platforms without protocol translation delays.

Frequently Asked Questions

Q: Does the 2MLL-EFMT support hot-swapping under rack power?

A: No. The MasterLogic-200 platform requires rack power to be completely isolated and shut down before inserting or removing any communication interface module. Live insertion or extraction can cause damage to the internal backplane transceiver chips.

Q: Which communication protocols are natively supported by the 2MLL-EFMT?

A: The module supports standard TCP/IP and UDP/IP stacks, allowing simultaneous operation of Modbus TCP (Master/Slave client configurations) and Honeywell’s proprietary high-speed peer-to-peer data exchange protocol.

Field Installation Guidelines

• Shielding and Cable Selection: Connection to the RJ-45 electrical port must use category 5 (Cat 5e/Cat 6) Shielded Twisted Pair (STP) cabling. Ground the shielding braid only at the industrial switch end of the link to eliminate ground loop currents.
• Chassis Rail Grounding: Mount the MasterLogic rack chassis securely on a standard DIN-rail that is physically bonded to the safety ground of the distribution panel. The ground system resistance must measure less than 100 Ohms.
• Physical Routing Separation: Route the network Ethernet drop cable in dedicated wiring ducts separated from 110/220 VAC power lines and high-voltage motor control lines by at least 300 mm to minimize electromagnetic noise coupling.