Honeywell TK-PRS021 Coated C200 Control Processor

Description

Key Technical Specifications

Available industrial documentation confirms TK-PRS021 as a 24 VDC, conformally coated C200 Control Processor. However, the exact assembly suffix is important because listings show multiple 51404305-x variants associated with TK-PRS021.

Product Introduction

The Honeywell TK-PRS021 is the conformally coated version of the C200 Control Processor used in Honeywell Experion PKS process-control systems. The processor executes control strategies and operates within the chassis architecture. Honeywell specifically lists TK-PRS021 as the coated processor.

The conformal coating is the key distinction from the corresponding processor. For procurement, however, the base model alone should not be treated as sufficient identification. Available component listings associate TK- with several part-number variants, including 51404305-475, so the installed nameplate and revision should be matched before replacement.

Installation & Configuration Guide

Stage 1 — Pre-Installation Preparation (~5 minutes)

1. Place the process in its approved maintenance state and apply LOTO where required.
2. Confirm the processor marking: .
3. Record the complete Honeywell part number and hardware revision.
4. Back up the /Experion PKS application configuration.
5. Determine whether the controller is standalone or redundant.
6. Photograph chassis position, processor connections, and status LEDs.
7. Use appropriate ESD precautions.

⚠️ Do not substitute TC- simply because it has the same basic processor function. Honeywell identifies TK- specifically as the coated version.

Stage 2 — Removing the Existing Module (~5 minutes)

1. Confirm the controller’s operational state.
2. For a redundant , identify the active and standby processors.
3. Follow the approved Honeywell procedure before removing an active processor.
4. Disconnect applicable connections.
5. Release the chassis retention mechanism.
6. Withdraw the processor carefully.
7. Inspect the backplane connector and adjacent modules.

Do not discard the old processor until the replacement has completed functional testing.

Stage 3 — Installing the Replacement (~5 minutes)

1. Verify the model and complete part number.
2. Confirm the replacement’s hardware revision.
3. Check that the conformal-coated construction matches the installed requirement.
4. Use ESD protection.
5. Insert the processor into the correct chassis position.
6. Secure the module.
7. Reconnect all applicable communication and controller connections.
8. Confirm that no connector is partially seated.

⚠️ Mechanical fit is not sufficient for processor replacement. Firmware, application configuration, hardware revision, and redundancy configuration must also be considered.

Stage 4 — Power-On & Testing (~10–15 minutes)

1. Verify the 24 VDC supply.
2. Energize the chassis according to the site procedure.
3. Check processor status LEDs.
4. Verify communication with the Experion engineering environment.
5. Confirm controller identity and chassis configuration.
6. Restore or verify the application configuration.
7. Check I/O communication.
8. For redundant systems, verify active/standby status.
9. Review processor diagnostics and system alarms.
10. Return the process to automatic control only after the required acceptance checks pass.

A processor that powers up without a diagnostic alarm is not necessarily a successful replacement. Controller communication, application execution, I/O status, and redundancy behavior still need to be verified.

TK-PRS021

TK-PRS021

TK-PRS021

Frequently Asked Questions (FAQ)

Q1. What is Honeywell TK-?

TK- is a conformally coated Honeywell Control Processor used within the Experion PKS process-control architecture. Honeywell’s system documentation explicitly identifies TK- as the coated processor.

Q2. What is the difference between TK- and TC-?

The primary documented distinction is the conformal coating. Honeywell lists TK- as the coated Control Processor, while TC- is the corresponding uncoated processor.

For an installed system, do not assume they are interchangeable without checking the system bill of materials, environmental requirements, hardware revision, and application documentation.

Q3. What voltage does TK- use?

The processor is associated with a 24 VDC system supply. Detailed processor power requirements involve internal supply rails, so chassis-level power loading should be checked against the installed power architecture rather than using only the 24 VDC figure. Available technical listings also identify +5 VDC and +3.3 VDC module power requirements.

Q4. Can TK- operate in a redundant controller?

Yes, redundant architectures can use the appropriate processor and redundancy hardware. TK-PRR021 is identified by Honeywell as the coated redundancy module associated with the architecture.

The exact redundancy arrangement must be checked against the installed chassis and controller configuration.

Q5. Is TK- obsolete?

It is a legacy/discontinued component. Current industrial automation parts references identify TK- as discontinued by the manufacturer.

For plants still operating /Experion PKS systems, maintaining tested spare processors can reduce the risk associated with an unexpected controller failure.

Q6. Does TK- have only one associated part number?

No. This is an important procurement issue. Listings associate TK- with different 51404305-x assembly numbers, including 51404305-475, while other sources identify different suffixes.

Therefore, TK- should be ordered by the complete nameplate/catalog number, not merely by the short model designation.

Q7. What should procurement verify before ordering TK-?

Verify:

• Exact model
• Complete Honeywell part number
• Hardware revision
• Conformal-coated construction
• Firmware compatibility
• chassis compatibility
• Redundancy requirements
• New surplus vs. refurbished vs. used condition
• Functional test documentation
• Warranty and traceability

For a safety- or process-critical installation, I would treat the complete part number and revision as mandatory purchasing data, especially because multiple 51404305-x variants appear under the TK- designation.