Description
Product Introduction
The Honeywell TK-PRS021 (commonly cataloged under base assembly number 51404305-375 or coated assembly 51404305-275) serves as the primary C200 Control Processor module within Honeywell’s Experion PKS automation platform. Engineered for continuous process environments, it executes complex function block structures, regulatory control loops, and sequential logic schemes while managing deterministic I/O scan routines across local and remote chassis.
Operating over a ControlNet or Fault Tolerant Ethernet (FTE) control network infrastructure, the TK-PRS021 acts as the real-time processing engine that bridges field I/O signals to higher-level Experion servers. Its modular double-width housing installs directly into standard C200 chassis racks, providing native integration with Redundancy Modules (RM) to support seamless, sub-second failover configurations.
Key Technical Specifications
| Parameter | Value / Feature |
| Manufacturer | Honeywell |
| Product Family | Experion PKS (C200 Architecture) |
| Model Number | TK-PRS021 |
| Honeywell Part Number | 51404305-375 (Coated: 51404305-275) |
| Module Type | C200 Control Processor Module |
| Processor Type | High-performance 32-bit RISC microprocessor |
| Execution Speed | Configurable task cycles down to 50 ms |
| Form Factor | Double-width C200 chassis slot card |
| Redundancy Support | Supported via paired CPM configuration and Redundancy Module (TK-PRR021) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
Application Scenarios & The “Trench” Experience
A unexpected power surge at a continuous polymer plant degrades the flash memory on a primary C200 control processor card. The secondary processor takes over, but running unredundant leaves the entire polymerization reactor vulnerable—a second trip will lock up the agitators, causing $500,000 in solidifying product losses and weeks of manual cleanout. Finding an exact replacement Honeywell TK-PRS021 unit quickly allows engineers to sync a fresh processor into the secondary slot live, restoring full redundancy before the main plant suffers a catastrophic shutdown.
- Chemical & Petrochemical Refining: Manages continuous distillation columns, exothermic reactor loops, and multi-variable PID matrices.
- Oil & Gas Production: Controls separation trains, gas compression units, and custody transfer metering platforms.
- Pulp & Paper Processing: Regulates high-speed paper machine drives, stock preparation, and chemical recovery boilers.
- Power Generation: Controls balance-of-plant (BOP) systems, feedwater pumps, and steam turbine governor tracking.
Transparency SOP: Quality Assurance & Testing
- Inbound Mechanical Audit: Inspect the dual-slot plastic casing, check backplane multi-pin headers for fatigue or bent pins, and verify factory barcode and revision serial tags.
- Backplane Boot & POST Check: Slot card into a live C200 test rack; verify core power-on self-test (POST) sequences and observe front diagnostic LED states.
- Control Database Load Test: Connect via Experion Control Builder; download a high-density test strategy containing 200+ PID blocks to verify memory retention and execution stability.
- Redundancy Failover Simulation: Pair the TK-PRS021 with a secondary module and Redundancy Cable; trigger primary power drops to confirm seamless control takeover.
- ESD Packaging & Dispatch: Enclose in static-shielding bags, cushion with high-density foam, and package in reinforced shipping cartons.
TK-PRS021
TK-PRS021
TK-PRS021
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Match Firmware Major Revisions: Never swap a TK-PRS021 without checking its loaded firmware version against your Experion PKS system release (e.g., R300, R400). If the firmware revision on the new card does not match the server project build, the processor will lock in ALIVE status and refuse to load the control database.
- ❗ Verify Conformal Coating Status: If your panel sits in a corrosive environment (such as an offshore platform or sulfur recovery unit), ensure you install the coated variant (51404305-275). Installing a non-coated card (51404305-375) in a harsh environment will lead to rapid trace dendrite growth.
- ⚠️ Do Not Force the Chassis Module: The TK-PRS021 is a double-width card using two backplane alignment slots. Ensure both top and bottom card guides engage smoothly before pushing the locking levers—forcing the card in out of alignment will snap the internal backplane pins.
- ❗ Back Up Database Before Swapping: If you are pulling an active processor, always perform an upload and save a full checkpoint file in Control Builder first. Swapping hardware without a verified backup risk losing offline forces and runtime tuning parameters.
Frequently Asked Questions (FAQ)
Q: Is the Honeywell TK-PRS021 module hot-swappable?
A: Yes, in a redundant C200 controller chassis pair. You can safely remove a faulted secondary processor while the primary unit actively executes the control strategy. In a non-redundant rack, pulling the processor will stop all control execution.
Q: What is the relationship between TK-PRS021 and model number TK-PRS022?
A: The TK-PRS022 is a later hardware iteration with updated internal memory chips and faster processing capability, but the TK-PRS021 remains the standard workhorse for thousands of legacy C200 Experion systems globally.
Q: Does the TK-PRS021 retain its database during a total rack power loss?
A: The card relies on chassis backplane power and a paired Battery Extension Module (such as the TC-PPD011) to preserve volatile RAM memory during an extended utility power outage.
Q: What do the front status LEDs indicate on boot?
A: During normal boot, the status LEDs cycle through initial diagnostic checks until the OK light turns solid green. A flashing red light indicates a hardware self-test failure or corrupted system software.
Q: What warranty applies to this surplus processor module?
A: All clean surplus and fully tested refurbished TK-PRS021 processor cards include a full 12-month replacement warranty from the delivery date.
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