1606-XLERED | Dual-Input Diode Redundancy Module | Oiltech Controls Review
The 1606-XLERED is an Allen-Bradley Bulletin 1606-XL diode decoupling module. It takes two DC feeds and isolates them through diode paths. Each input carries 10 A, and the shared output handles 20 A nominal. Because the two paths never back-feed, one supply can fail without pulling down the rail. The trade-off is a 780 mV nominal drop, so trim the source supplies upward. Engineers use it to build 1+1 redundancy without a bus controller.
Bulletin 1606-XL Redundancy Role
- Sits downstream of two supplies, not inside a single unit
- Diode decoupling only, so no active load sharing
- No bus port, so it stays outside network diagnostics
- Narrow 32 mm body leaves room for more rails
- DIN rail clip with enclosure mount option
- Pairs with 1606-XLE or XLS feeds in the same panel
Electrical Ratings
- Input voltage: 18…60 V DC range
- Inputs: 2, at 10 A each nominal
- Output voltage: 24…48 V nominal
- Output current: 20 A nominal, 25 A max at short circuit
- Voltage drop: 780 mV nominal per path
- Decoupling: diode, no active switching
Thermal, Mechanical and IP Data
- Operating temperature: -40 to +70 °C
- Storage range: not published in the 1606-TD002H table
- Humidity: not published in the 1606-TD002H table
- Size (H×W×D): 124 × 32 × 117 mm
- Weight: 350 g
- IP rating: IP20, DIN rail, enclosure mount
- Lifecycle: active on Rockwell pages, listed in 1606-TD002H (July 2023), checked 2026-10
Approvals
- UL 60950-1 listed
- cUL certified
- CE marked
- Built to Bulletin 1606 series spec
- Documents on request
Where This Module Fits
- Redundant 24 V rails for PLC backplanes
- Two-supply panels where a single feed cannot drop
- Process skids with long restart cycles
- Telecom and SCADA nodes on 48 V DC
- Retrofit of older diode-OR schemes in the same slot
- Spare stock for active 1606-XL redundancy lines
Why Buy From Oiltech Controls?
- Over 15 years in automation spare parts
- Global delivery by FedEx, UPS and DHL
- Tested surplus and refurbished units offered
- 12-month warranty on every module
- Diode drop check and verification before dispatch
- Long support for obsolete control systems
Dispatch and Warranty
- Stock units ship in 24 to 28 hours
- Courier choice: FedEx, UPS, DHL
- 12-month warranty for defects in normal use
- Claim needs order number and photos
- Result: replacement or credit after test
Professional FAQ
Q: Do I need to raise both supply setpoints for the 780 mV drop?
A: Yes, in most cases. Set each source near 24.8 V so the load sees about 24 V after the diode. Check that downstream devices accept the higher idle rail.
Q: Can I parallel the two inputs from one supply for more current?
A: It is allowed, but you gain little. Each path still carries 10 A, and the drop stays. For higher current, move to a larger redundancy frame.
Q: Does this module share load evenly between supplies?
A: No. Diode decoupling passes current from the higher source first. The second supply idles until the first drops. That is normal for diode-OR designs.
Q: What happens on a short circuit at the output?
A: Output current can reach 25 A briefly. Check the upstream supply current limit and fuse the load branch. Long faults should trip the source, not the diode.
Q: Is storage temperature a risk if I stock spares?
A: The 1606-TD002H table omits it. Keep spares in a dry room between -25 and +55 °C to stay safe. Ask us for the latest datasheet before long storage.
Contact
Email: info@oiltechcontrols.com
WhatsApp: +86 158 8020 0923
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