Description

Honeywell 2MLR‑E12P 12‑Slot Passive Expansion Base Rack

Technical Specifications

• Part Number: 2MLR‑E12P；Conformal coated variant: 2MLR‑E12P‑CC
• Brand: Honeywell (MasterLogic‑200 / ML200R PLC platform)
• Warranty: One Year
• Type: Passive backplane expansion base rack, 12 module slots
• Power Supply: 24 VDC system bus power; consumption 220 mA @24 VDC
• Mounting: Panel‑mount / DIN‑rail TS35 installation
• Operating Temperature: 0 °C ~ +55 °C cabinet‑mount
• Storage Temperature: ‑20 °C ~ +70 °C
• Humidity: 5‑95 % RH non‑condensing
• Slots: 12 universal slots; supports digital‑I/O, analog‑I/O, high‑speed counter, serial / Ethernet communication modules; slot‑free assignment, no fixed‑function slot restriction
• Backplane Interface: Dedicated connector for expansion driver module (2MLR‑DBSF) to AF100 fieldbus
• Dimensions: 481 mm × 98 mm × 19 mm; weight approx 0.59 kg
• Protection Class: IP20 cabinet‑only installation; passive backplane without onboard logic chips

Product Overview

The 2MLR‑E12P is a passive 12‑slot expansion base rack for Honeywell MasterLogic‑200 PLC / Experion‑LX DCS systems. It serves as mechanical carrier and backplane bus for remote I/O modules. Install expansion driver module (2MLR‑DBSF) into slot‑0, then connect to main CPU rack over AF100 fiber‑bus. All other slots can freely populate digital, analog and communication modules. It enables large‑scale distributed I/O expansion; maximum 31 expansion bases can be connected within one MasterLogic‑200 systemManualsLib.

This base solves distributed‑I/O layout challenges: flexible 12‑slot universal passive rack, mixed‑module free‑slot arrangement, drop‑in spare‑part compatibility for legacy MasterLogic‑200 retrofit‑maintenance projects. DCS‑PLC engineers, power‑plant & petrochemical‑site maintenance technicians and retrofit integrators benefit most. Widely used for utility power‑plants, pulp‑and‑paper and oil‑gas plant control‑system remote‑I/O cabinets.

Key Application Notes

• Passive mechanical backplane rack; cannot operate standalone. Requires 2MLR‑DBSF fiber‑driver module, AF100 fiber‑bus and MasterLogic‑200 main CPU rack.
• Slot‑0 is reserved for expansion‑driver module; other slots accept any MasterLogic‑200 series I/O / communication modules without slot‑function restriction. ‑‑CC suffix means conformal‑coated PCB for high‑humidity / corrosive cabinet environments.
• Not hot‑swap structure; cut off 24 VDC base power before inserting/removing modules.
• Original OEM production is obsolete; widely used aftermarket spare for existing plant‑system maintenance‑retrofit projects.
• Follow Honeywell MasterLogic‑200 hardware manual for AF100 bus termination and station‑address configuration.