Allen-Bradley 1606-XLBUFFER Buffer Module

Allen-Bradley 1606-XLBUFFER DC Buffer Module

The 1606-XLBUFFER belongs to the Allen-Bradley Bulletin 1606-XL legacy series. This unit bridges short supply interruptions on a 24 V DC system. Its buffer time of 200 ms keeps critical loads running during brief power dips. Engineers often specify this model to prevent nuisance shutdowns on PLC and control circuits. The 1606-XLBUFFER works alongside a standard 24 V power supply and requires no separate charger. Ready, buffering, and inhibit signals give operators clear status feedback. Rockwell discontinued this model on October 30, 2017, and offers the 1606-XLSBUFFER24 as a direct replacement. Nevertheless, many sites still source the original unit for maintenance and spare parts.

Technical Specifications

The electrical performance of the 1606-XLBUFFER suits short ride-through duty. Input voltage is DC 24 V nominal from the system supply. Output voltage stays at DC 24 V nominal, so downstream devices see no change. Output current reaches 20 A nominal, which covers typical control cabinet loads. Buffer time is 200 ms per the official ODVA conformance listing. The module stores energy internally and releases it when input voltage drops. Additionally, ready, buffering, and inhibit signals support status monitoring. No communication interface exists on this model, which keeps wiring simple. Approvals include UL 60950-1, cUL, and CE marking per the Bulletin 1606 standard.

Mechanical and Environmental Parameters

The unit uses DIN rail mounting for quick installation in control cabinets. Dimensions measure 124 × 64 × 102 mm in H×W×D format. Weight is approximately 740 g. Operating temperature ranges from -10 to +70 °C per the XL series migration document. The protection rating is IP20, reflecting its open-frame DIN-rail construction. Storage temperature and relative humidity are not published for this legacy series. Therefore, users should follow general cabinet guidelines for storage. The compact footprint matches other Bulletin 1606-XL units, which simplifies panel layout. Meanwhile, the shared form factor allows clean side-by-side mounting with the associated power supply.

Installation Guide

First, mount the 1606-XLBUFFER on a standard 35 mm DIN rail next to the 24 V supply. Next, connect the DC input terminals to the system bus. Then, wire the DC output to the loads that need ride-through protection. Keep the input and output wiring short to minimize voltage drop. Additionally, connect the ready, buffering, and inhibit signals to the control system if monitoring is required. Finally, check all connections before applying power. The IP20 rating requires installation inside a protective enclosure. Proper airflow around the unit supports reliable cooling during buffering events.

Packaging List

• 1 × Allen-Bradley 1606-XLBUFFER DC Buffer Module

• 1 × Installation Instruction Sheet

• Protective cardboard packaging

FAQ

Q1: How long can the 1606-XLBUFFER support the load during a power dip?
A1: The module bridges interruptions for up to 200 ms at 20 A nominal. This covers most short supply dips and switching transients.

Q2: Does this buffer module require a separate battery or charger?
A2: No, the unit stores energy internally and needs no external battery. It connects directly to the 24 V DC system bus.

Q3: Is a direct replacement available for the 1606-XLBUFFER?
A3: Yes, Rockwell lists the 1606-XLSBUFFER24 as the direct replacement. The original model was discontinued on October 30, 2017.

Q4: What shipping methods do you offer?
A4: We ship worldwide via Fedex, UPS, and DHL. Tracking information is provided after dispatch.

Q5: Does the 1606-XLBUFFER include a communication port?
A5: No communication interface is built in. The unit provides ready, buffering, and inhibit signals for status monitoring.