Description

The 1606-XL240E​ is an Allen-Bradley (Rockwell Automation) Bulletin 1606-XL switched mode power supply delivering 240 W of regulated 24 V DC at 10 A from a wide-range AC input. It is a DIN rail-mounted, convection-cooled unit built to power PLCs, I/O, HMIs, sensors and field instrumentation inside industrial control cabinets.Rockwell lists it as the Power Supply XL 240 W, discontinued since October 2017, with 1606-XLE240E​ named as the direct replacement. That status is precisely why 1606-XL240E​ remains in demand: thousands of panels were built around it, and a like-for-like swap is far cheaper than re-engineering a cabinet’s power architecture.

Application Scenarios

A water treatment plant has a control panel powering a CompactLogix processor, remote I/O adapters, an HMI and a bank of solenoid valves. The 24 V supply is years old, the cabinet runs warm in summer, and one morning the PLC resets during a pump start — no fault logged, no obvious cause. The maintenance team checks the program, the communications and the field devices, and only later discovers the supply had been quietly derating in a 65 °C cabinet until it could no longer hold the load through the inrush.This is the daily reality where 1606-XL240E​ operates. It is the foundation layer that everything else depends on, and its failure modes are deceptive: a sagging 24 V rail shows up as random PLC resets, nuisance comms faults, sensors dropping out and outputs chattering — never as “power supply failed.” Because the unit derates above 60 °C, a panel that was adequately specified on paper can fall short once filters clog, cabinet fans fail or a second heat source is added to the enclosure.The second pain point is procurement and lifecycle. 1606-XL240E​ is discontinued and marked non-repairable by Rockwell, so a plant that loses one during an outage cannot simply reorder from the distributor. The choice becomes an available tested spare now, or a migration to the XLE replacement later — and knowing that 1606-XLE240E​ is the designated direct replacement lets a plant plan the migration deliberately instead of under pressure.

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