Honeywell TK-PRS022 – 24 VDC Power Supply Module for DCS/PLC Cabinets

The Honeywell TK-PRS022 is a dedicated power supply module typically used to feed controller and I/O backplanes in Honeywell process control cabinets. From my experience, the “-022” suffix usually indicates a 24 VDC input variant, which makes it a straightforward choice in cabinets that already distribute 24 VDC. It fits cleanly into the system chassis, supports robust backplane power, and is commonly paired in redundancy for higher availability on critical units and skids.

One thing I appreciate is how predictable these are in the field—stable output, clear status indication, and no drama during commissioning. You might notice that most plants use them in redundant pairs; it seems to be the simplest way to get “online maintenance” capability without shutting the node down, especially on refinery furnaces, chemical batch trains, or boiler control islands.

Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: 1 week for in-stock; no more than one month at the latest
• Payment: 50% advance payment; full payment before delivery
• Express options: FedEx, UPS, DHL

Key Features

• 24 VDC Input (cabinet-friendly): The TK-PRS022 is designed for 24 VDC supply buses, which is standard in many DCS/PLC panels.
• Backplane Power for Controller/I/O: Feeds regulated power to the system backplane; no process signals are handled by this module.
• Redundant-ready: Commonly deployed as a redundant pair to improve availability; in many cases this allows online replacement in the event of a single-module issue.
• Status LEDs and quick diagnostics: Clear power/health indication simplifies startup checks and routine walkdowns.
• Built-in protection: Typically includes over-current, short-circuit, and thermal protection to safeguard the rack and connected electronics.
• Cabinet-friendly form factor: Installs into the Honeywell system chassis/backplane slot for neat wiring and fast swap-outs.

Technical Specifications

Related or Supporting Products

• Honeywell TK-PRS021: Similar power module with AC mains input (100–240 VAC) typically used where DC buses are not present.
• Honeywell system chassis/backplanes: Required for module installation; choose the chassis matched to your controller/I/O family.
• 24 VDC cabinet supply and distribution: External DC supply, fusing, and power distribution terminals sized per load and redundancy scheme.

A utilities client told me they migrated to TK-PRS022 when standardizing on 24 VDC cabinets; swapping from the AC-input variant was straightforward and took under an hour per node, including redundancy checks.

Installation & Maintenance

• Cabinet environment: Mount in a clean, dry control cabinet with adequate ventilation; avoid heat sources and maintain airflow around the module.
• Power wiring: Use a clean, regulated 24 VDC feed with proper grounding. Size wiring and fusing per load and local electrical codes. Keep DC return and protective earth distinct as per Honeywell panel standards.
• Redundancy: For critical nodes, install dual TK-PRS022 modules feeding the same backplane (A/B). Verify LED status and switchover behavior during FAT/SAT.
• Backplane seating: Ensure the module is fully latched in the chassis to avoid intermittent power drops on the bus.
• Routine checks: Periodically inspect for dust buildup, verify LED indicators, torque-check power terminals, and confirm DC bus health under load.
• Spare strategy: Keep at least one spare per system area; where redundancy is used, many sites keep two spares for faster recovery.

Quality & Certifications

• Certifications: CE, UL/cUL, and RoHS compliance are typical for Honeywell DCS power modules (certification set may vary by revision).
• Manufacturer warranty: Backed by a 365-day warranty on supply.

If you’re replacing an existing module, share the controller family and cabinet power details. Matching on input type (DC vs AC) and redundancy setup usually shortens commissioning, and in many cases avoids any wiring changes.