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Product Overview
The TK-PRS021 (Part Numbers: 51404305-275 / 51309283-200) is a high-performance Control Processor Module designed for Honeywell Experion PKS and legacy DCS environments. Serving as the computational "brain" of the control system, it manages complex logic execution, data acquisition, and high-speed industrial communication. With 4 MB of dedicated user memory, the module efficiently handles advanced control algorithms and large-scale data points.

Engineered for mission-critical reliability, the TK-PRS021 supports redundant configurations, ensuring seamless failover during hardware faults. Its robust construction allows operation in extreme thermal and industrial conditions, making it ideal for sectors such as oil & gas, power generation, and chemical manufacturing.


Technical Specifications

Feature Specification
Model Designation TK-PRS021 (51404305-275)
Alternative Reference 51309283-200
Module Type Control Processor Unit (CPU)
Onboard Memory 4 MB High-Speed User Memory
Redundancy Capability Fully supports synchronized redundant pairing and seamless failover
Industrial Protocols Foundation Fieldbus, Profibus, Honeywell proprietary links
Operating Temperature -40°C to +70°C (-40°F to +158°F)
Module Dimensions 17.8 × 7.6 × 27.9 cm
Unit Weight 1.9 kg 

Application Scenarios

  • Executing complex PID loops and interlocking logic in DCS

  • Managing redundant processor clusters in petrochemical refining plants

  • Providing high-availability control for large-scale pharmaceutical batch processing

  • Integrating fieldbus devices into centralized Honeywell control architectures


Frequently Asked Questions (FAQ)

Q: Are 51404305-275 and 51309283-200 the same module?
A: Yes. TK-PRS021 is the primary model number. 51404305-275 usually refers to the full assembly, while 51309283-200 often indicates the PCB or specific firmware revision. Both are functionally equivalent.

Q: Can this module be used in non-redundant applications?
A: Yes. While designed for redundancy, the TK-PRS021 operates as a standalone processor in systems where a single CPU meets the control requirements.

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