When DeviceNet Power Delivery Fails on Aging Lines

A common challenge on legacy DeviceNet segments is maintaining stable 24 V power when cable runs are long and node counts are high. The Allen-Bradley 1606-XLDNET8 addresses this by providing a current-limited 8 A source rated for thick DeviceNet cable. As a result, engineers can keep existing network infrastructure operational while planning a migration path.

This power supply belongs to the Bulletin 1606-XL series and is now discontinued as of October 30, 2017. The direct replacement is the 1606-XLSDNET8. For new designs or drop-in upgrades, verify current lifecycle status with PetroPartsOnline before ordering.

Key Features and Technical Specifications

• Output voltage: DC 24 V nominal from the Bulletin 1606 Special Modules table.
• Output current: 8 A nominal, current-limited to 8 A for thick DeviceNet cable.
• Rated power: 192 W per the DeviceNet 8 A column.
• Input voltage: AC 100...240 V nominal, with operational range 85...276 V AC / 88...375 V DC.
• Input current: 2.3 A at 100 V AC and 1.0 A at 240 V AC.
• Efficiency: Typically 92.7%.
• Hold-up time: 38 ms at 120 V AC and 41 ms at 240 V AC.
• Operating temperature: -25...+70 °C, with derating above 60 °C.
• Protection rating: IP20 for DIN-rail open-frame construction.
• Dimensions (H×W×D): 124 × 60 × 117 mm; weight 0.90 kg.
• Approvals: UL 60950-1, cUL, and CE marked per Bulletin 1606 series standard.

The current-limited output is particularly valuable on thick DeviceNet cable, where inrush currents can trip protection on non-limited supplies. Meanwhile, the wide input range supports global plant voltages without external taps.

Applications and Use Cases in Oil and Gas

DeviceNet remains common in valve manifolds, motor starters, and remote I/O on legacy skids. Therefore, a dependable 24 V source is essential for keeping those nodes alive. The 1606-XLDNET8 suits retrofit projects where existing thick cable networks must stay powered during controller upgrades. In addition, its -25 °C start-up capability supports outdoor installations in cold climates. Because the unit is DIN-rail mountable, technicians can replace failed supplies quickly during maintenance windows. Finally, the 192 W rating covers moderate node counts without adding a second supply.

Installation and Setup Guidance

Mount the unit on standard DIN rail inside a protective enclosure rated for the ambient conditions. Connect input wiring to the AC 100...240 V nominal terminals, observing the operational range of 85...276 V AC / 88...375 V DC. For output, use conductors sized for 8 A and terminate at the DeviceNet thick cable power taps. The DC OK status indicator helps verify output presence during commissioning. Since the supply has no communication interface, no protocol configuration is required. Always follow local electrical codes and the manufacturer's installation instructions.

Maintenance and Reliability in Demanding Environments

This power supply is built for demanding environments, yet periodic inspection remains important. Check for dust accumulation on the open-frame construction and verify that cabinet ventilation maintains temperatures below 60 °C. Above that threshold, derating applies and output capacity decreases. Inspect input and output terminations for tightness during scheduled shutdowns. Because the unit is discontinued, keep spare units or plan migration to the 1606-XLSDNET8. PetroPartsOnline can help source remaining stock or advise on the replacement path.

Compatibility and Integration Notes

This unit is a DeviceNet-rated source with no on-board protocol interface. Therefore, it powers the network but does not communicate on it. When integrating into an existing DeviceNet segment, confirm that thick cable power taps and node current draw stay within the 8 A limit. If the segment uses thin cable or mixed cable types, verify voltage drop calculations. For projects requiring network diagnostics, an external gateway or connection module may be needed; confirm cable and gateway compatibility with PetroPartsOnline.

Frequently Asked Questions

What is the output voltage of the Allen-Bradley unit?

This unit provides a DC 24 V nominal output, as listed in the Bulletin 1606 Special Modules table.

Is This unit still available for plc power supply module replacement?

The model was discontinued on October 30, 2017. The direct replacement is the 1606-XLSDNET8. Contact PetroPartsOnline to verify current stock or discuss replacement options for your plc power supply module replacement project.

What is the operating temperature range?

The unit operates from -25 to +70 °C, with derating required above 60 °C.

Does this power supply support DeviceNet communication?

No. It is a DeviceNet-rated power source with no built-in communication ports or protocol interface.

What input voltage does This unit accept?

It accepts AC 100...240 V nominal, with an operational range of 85...276 V AC / 88...375 V DC.

Contact PetroPartsOnline for parts suited to your application's requirements.

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