Description
Product Overview
Controller processor faults can interrupt control execution, disrupt communication with I/O modules, and complicate recovery in an established distributed control system. The Honeywell TC-PRS021 is the Control Processor Module used in the Experion PKS C200 controller family. It provides the processing function at the center of the C200 controller architecture, working with the chassis, I/O interfaces, communication modules, and associated controller hardware. Correct model identification is essential when restoring an installed system or maintaining a legacy control platform.
Honeywell’s controller installation documentation identifies the TC-PRS021 as a C200 processor with 4 MB of user memory and confirms that it can be used in both redundant and non-redundant controller configurations. Redundancy, however, depends on the overall controller design and the compatible supporting modules; installing a processor by itself does not establish a redundant configuration. The enhanced C200E controller uses the Tx-PRS022 model family and is documented with 16 MB of user memory. It should not be treated as an automatic substitute for a TC-PRS021 without reviewing the controller architecture and application requirements.
When sourcing a Honeywell TC-PRS021, compare the complete model code, product label, board revision, and installed Experion PKS release. Confirm whether the existing controller is configured for redundancy, and record the controller’s application and configuration information before carrying out a processor exchange. Also check the installed chassis and associated communication modules against the applicable hardware planning documentation.
The TC-PRS021 is reported as discontinued, making inspection and test evidence particularly important. Ask for photographs of the actual unit, confirmation of its condition, and available functional test results. For a previously installed processor, establish whether its battery and retained configuration data require attention before commissioning. These checks help distinguish a physically matching spare from one that is suitable for the intended controller configuration.
Product Introduction
A processor replacement in a legacy DCS requires more than matching the front-panel label. The Honeywell TC-PRS021 is the 4 MB C200 Control Processor Module used in Experion PKS installations, including redundant and non-redundant controller configurations.
Before ordering, verify the installed controller generation, firmware compatibility, and redundancy arrangement. Confirm whether the required part is the standard TC- or coated TK- to avoid a mismatch during maintenance.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | TC- |
| Manufacturer | Honeywell |
| System Platform | Experion PKS |
| Controller Family | C200 |
| Product Type | Control Processor Module (CPM) |
| Primary Function | Controller processing and control execution |
| User Memory | 4 MB |
| Controller Configuration | Redundant or non-redundant, subject to system design |
| System Supply Reference | 24 VDC, as listed in parts references; verify exact electrical requirements in the hardware manual |
| Associated Part References | 51404305-225 / 51404305-325; verify against the installed unit |
| Coated Variant | TK- |
| Enhanced Controller Family | C200E / Tx-PRS022; not an assumed direct replacement |
| Installation | Compatible C200 controller chassis |
| Communication Interfaces | Determined by the installed communication modules and configuration |
| Operating Temperature | Verify against the applicable Honeywell hardware specification |
| Protection Rating | Not confirmed for this model |
| Firmware Compatibility | Verify against the installed Experion PKS release |
| Lifecycle Status | Reported discontinued |
| Condition | Confirm for the individual unit |
Specifications are based on Honeywell controller documentation and parts references. Confirm the complete model code, hardware revision, and applicable system manual before installation.
TC-PRS021
Related Products
The following components belong to or complement the Honeywell / Experion PKS control architecture. They perform different roles and should not be considered direct replacements for the TC-.
- TK- — Coated version of the Control Processor Module. Check the required coating and exact hardware reference before substitution.
- Tx-PRS022 — C200E Control Processor family, documented with 16 MB of user memory. Requires a system compatibility review before considering an upgrade.
- TC-PRR021 — redundancy module, used for redundancy-related controller functions rather than primary processing.
- TC-CNI-series modules — ControlNet interface modules used for controller and I/O network connectivity. Select the specific interface variant to match the network architecture.
- TC-CEN011 — Ethernet module identified in Honeywell system documentation. Verify the required interface and system revision before use.
- TC-CEN021 — 10/100 Mb Ethernet module listed in Honeywell’s system reference material. Confirm compatibility with the intended chassis and configuration.
- TC-FXX101 — Ten-slot chassis reference. Useful when checking physical installation and controller layout.
- TC-FXX071 — Seven-slot rack reference for system planning. Confirm chassis type and installed module requirements.
Frequently Asked Questions
What is the Honeywell TC- used for?
It is the Control Processor Module for the Honeywell Experion PKS controller. Its function is distinct from that of individual analog I/O, digital I/O, or network interface modules.
Can I hot-swap the TC-?
Do not assume that it can be removed under power. Follow the approved maintenance procedure and determine whether the installed redundant configuration supports the intended replacement sequence. Confirm controller state and process impact before removing the processor.
Does the TC- support a 16 MB memory upgrade?
Honeywell documentation assigns 4 MB of user memory to the TC- and identifies the C200E Tx-PRS022 family as the enhanced controller with 16 MB. This is a different controller designation, not evidence that the TC- can be upgraded by changing memory alone.
Is TK- interchangeable with TC-?
Honeywell identifies TK- as the coated counterpart. The coating difference and the exact hardware reference should be checked against the site’s environmental requirements and procurement specification. Do not substitute solely because the base model designation looks similar.
How can I verify the condition and authenticity of a replacement?
Request photographs of the actual nameplate, board markings, and revision information. Confirm whether the unit is unused, used, or refurbished, and request test documentation appropriate to a processor. Packaging or a model label alone does not prove authenticity or operational condition.
Will replacing the TC- retain the existing control application?
Do not assume that the application and configuration will transfer automatically. Back up the supported controller configuration and document the installed Experion PKS release before maintenance. Follow Honeywell’s recovery procedure and verify the correct application, controller identity, and communication setup after replacement.
What should I verify before ordering a TC-?
Confirm the complete model number, any associated part number, board revision, chassis type, controller redundancy arrangement, and Experion PKS version. Also establish the unit’s condition, available test evidence, and warranty terms. These checks help reduce the risk of receiving a processor that physically fits but does not meet the installed system’s requirements.
