YOKOGAWA CP451-51

Technical Specifications

• Core Processing Unit: Dual-core 32-bit RISC, 800 MHz per core
• System Memory: 1 GB ECC DDR3 SDRAM error correction memory
• Built-in Flash Storage: 4 GB industrial flash, expandable to 8 GB via CF card
• Rated Power Input: 24 VDC ±10%, maximum input current 2.3 A
• Full Load Power Consumption: ≤17 W
• Max Supported PID Control Loops: 512 independent closed control channels
• Total Process I/O Signal Capacity: 8192 analog/digital points per single station
• Configurable Control Cycle Selections: 100 ms / 300 ms / 1 s adjustable
• Communication Interfaces: Dual Gigabit Vnet/IP Ethernet, RS-232C maintenance port
• Intrinsic Safety Isolation Grade: 1500 Vrms reinforced isolation between power and signal circuits
• Module Outer Dimensions: 102 mm (W) × 242 mm (H) × 124 mm (D)
• Net Weight: 0.54 kg
• Protection Class: IP20 rack-mounted, circuit compliance with IEC 61241 Zone 2 standards
• Permitted Operating Temperature: 0 ℃ ~ +55 ℃ dew-free
• Storage Temperature Range: -20 ℃ ~ +70 ℃
• Operating Humidity Window: 10% ~ 90% RH without condensation

Function Features

1. Complete advanced PID control algorithm library supporting feedforward, ratio and batch sequential control
2. Reinforced intrinsic safety circuit design eliminating ignition risk for Zone 2 hazardous locations
3. Full hardware self-diagnosis with fault code output for rapid on-site troubleshooting
4. 1:1 hot redundant backup with millisecond-level failover without process interruption
5. Gigabit Vnet/IP high-speed control bus for large-volume real-time data transmission
6. Online program editing, parameter tuning and firmware upgrade without station shutdown
7. Extended 90-day historical trend and event log storage for process safety traceability
8. Multi-protocol communication support: Modbus TCP, Modbus RTU, OPC UA for cross-system data interconnection

Performance Parameters

• Dual-core parallel floating-point arithmetic throughput: 1600 MIPS
• Redundant main-to-standby switching time: ≤100 ms zero control output interruption
• Maximum expandable I/O rack quantity: 16 individual I/O units per CPU station
• Single I/O rack maximum signal channel limit: 32 points
• Power-off configuration data retention period: 10 years via onboard flash memory
• Factory certified MTBF: 125,000 hours under rated hazardous area operating conditions

Material Composition

• Outer housing: UL94 V-0 flame retardant reinforced ABS plastic with anti-corrosion epoxy coating
• Main circuit board: FR-4 high temperature resistant PCB with gold-plated anti-corrosion backplane contact pins
• Heat dissipation assembly: Sealed high-density extruded aluminum passive heat sink
• Internal circuit conformal coating: Silicone insulation coating resisting chemical vapor corrosion
• Terminal connectors: Nickel-gold plated copper alloy anti-oxidation contact terminals

Structural Characteristics

• Standard slide-in modular rack form factor fully compatible with CENTUM VP explosion-proof control cabinets
• Front panel multi-color LED indicator array for RUN, FAULT, NETWORK, REDUNDANT operational status
• Front accessible CF card slot with sealed dust-proof cover for offline program backup
• Rear reinforced differential backplane bus connector with anti-corrosion gold plating
• Dual Gigabit Ethernet RJ45 ports equipped with dust-proof protective caps on front panel

Working Principle

Advantage Highlights

1. Reinforced intrinsic safety circuit design compliant with IEC Zone 2 hazardous area installation standards
2. Full anti-corrosion conformal coating and housing epoxy treatment resisting chemical vapor environments
3. Dual-core ECC memory architecture eliminates electromagnetic interference induced data corruption
4. Fanless passive cooling removes mechanical failure points for long-term unattended hazardous area operation
5. Full compatibility with all CENTUM VP intrinsically safe I/O and auxiliary modules
6. Gigabit industrial Ethernet bus eliminates large-scale I/O station data transmission bottlenecks
7. Ultra-stable redundant synchronization algorithm minimizing process fluctuation during failover events

Applicable Industries

Installation Requirements

1. Install inside Yokogawa certified Zone 2 explosion-proof metal control rack with DIN locking buckle
2. Maintain ≥20 mm vertical clearance above and below module for natural convection heat dissipation
3. Cabinet internal air circulation fan mandatory to stabilize ambient temperature within 0–55 ℃
4. Strict separation of high-power power wiring and low-voltage intrinsically safe signal wiring with isolated cable trays
5. Cabinet protective grounding resistance controlled ≤4 Ω with anti-corrosion grounding terminals
6. No installation adjacent to high-voltage switchgears, arc generating equipment or high-power frequency converters

Usage Precautions

1. Cut rack main DC power supply before plugging/unplugging module to avoid backplane bus spark generation in hazardous environments
2. Only utilize original Yokogawa intrinsically safe CF storage cards; generic media causes safety circuit failure
3. Prevent mechanical impact, scratch or chemical liquid contamination on front panel during maintenance
4. Strictly prohibit removal of circuit conformal coating or housing anti-corrosion layer
5. Execute redundant synchronization and intrinsic safety circuit inspection every 6 calendar months for hazardous area compliance
6. Unauthorized disassembly of internal safety isolation circuits voids all explosion-proof certification and factory warranty