Honeywell TK-PRS021 Power System Module

Overview

Core Electrical Specifications

1. Input Power

• External input: 24VDC industrial control power, operating current 1.6A max
• Dual redundant 24VDC input terminals support dual power supply to eliminate single power point failure

2. Multi-channel Regulated DC Output for Rack Backplane

• +5VDC @1.5A (logic core power for CPU & I/O cards)
• +3.3VDC @1.0A (communication bus & FPGA power)
• Isolated power rails separate control logic, field communication and I/O circuits to suppress EMI interference

3. Data Backup Power Supply
    
   Built-in replaceable lithium primary battery, maintains CPU volatile memory, control logic and process variables during full rack power loss:

• Standard battery backup duration: 144 hours (6 days)
• Optional BEM battery extension module extends backup cycle for long power outage scenarios

4. Redundancy Switch Performance

• Dedicated hardware switching circuit for dual TK-IOLI01 control processors
• Zero-data-loss bumpless switchover within microseconds when primary CPU fails, no production loop interruption
• Continuous health monitoring of primary/standby controller heartbeat, power rail voltage and backplane communication

Mechanical & Environmental Parameters

• Form factor: Standard C-series vertical plug-in rack module, hot-swappable (RIUP) without rack power-off
• Weight: ~0.5kg
• Operating temperature: 0℃ ~ +60℃; storage: -40℃ ~ +85℃
• Humidity: 5%–95% RH non-condensing
• Protection grade: IP20 (cabinet internal installation)
• Certifications: CE, UL508, FM Class I Div.2 hazardous area approval

Integrated Protection & Diagnosis

1. Full power rail protection: overvoltage, undervoltage, overcurrent, short-circuit auto-shutdown to protect CPU and I/O modules
2. Front panel multi-color LED indicators: rack power status, dual input power health, CPU redundancy active/fault, battery low voltage alarm
3. Real-time fault diagnostic data uploaded to Experion HMI: power rail deviation, battery aging, redundancy link disconnection, backplane communication failure
4. Built-in EMI filter, adapts to industrial cabinets with inverters, motors and welding equipment

Key Functions & Features

1. All-in-one rack power distribution hub
    
   Converts external 24VDC into multi-stable isolated power rails required by C300 rack CPU, I/O and communication cards, eliminating separate small power modules.
2. Hardware-level controller redundancy management
    
   Dedicated switching logic independent of CPU software, ensures reliable automatic master/standby switchover for safety-critical process loops.
3. Long-term power failure data retention
    
   Built-in backup battery avoids loss of control algorithms, setpoints and historical process parameters during grid power outage.
4. Hot-swap maintainable design
    
   Module can be replaced online without shutting down the whole DCS rack, minimize unplanned downtime for continuous production plants.
5. Unified C300 rack architecture
    
   Perfectly matched with TK-IOLI01 control processor, CC series I/O modules and TK-CCR014 redundant ControlNet communication cards.

Matching Combination

• TK-PRS021 Power Redundancy Module
• TK-IOLI01 C300 Control Processor (dual redundant pair)
• CC-PAIH02 / CC-TAIX01 Analog Input I/O set
• TK-CCR014 Redundant ControlNet communication module

Application Scenarios

• Petrochemical refinery, chemical plant continuous process DCS control racks
• Thermal power boiler & turbine critical control systems
• LNG storage, pharmaceutical, metallurgy high-reliability production lines
• All process industries requiring redundant controller architecture to avoid shutdown caused by CPU or power failure