Yokogawa CP345

Technical & Performance Specifications

• Main Processing Core: 32-bit high-speed RISC industrial processor
• System Memory: 128 MB application DRAM; 128 MB non-volatile flash memory for control logic retention
• Control Cycle Minimum Period: 100 ms high-speed control cycle
• Max Configurable Control Loops: Up to 1000 independent PID control loops per single CP345 module
• Redundancy Mode: 1:1 dual hot standby redundant support, bumpless automatic switchover
• Internal Communication Bus: Centum VP proprietary FIO bus for remote I/O module data exchange
• External System Interfaces: V-Net bus for inter-control-station data communication with operator stations
• Power Supply Input: 24 V DC backplane rack power supply
• Module Slot Standard: Centum VP standard control station rack card slot
• Operating Ambient Temperature: 0°C ~ 55°C continuous operation
• Humidity Tolerance: 10% – 90% RH non-condensing
• Protection Class: IP20 rack internal installation
• Certifications: CE, IEC 61508 SIL2 functional safety certification, UL industrial safety

Function Features

1. SIL2 certified safety-grade control logic execution for critical hazardous process loops
2. Full 1:1 hot standby redundant architecture with bumpless automatic fault switchover without process interruption
3. Native multi-variable PID, cascade control, ratio control, feedforward control algorithm library built-in
4. Massive support for sequential interlock logic, batch sequential control and equipment interlock protection logic
5. Real-time FIO bus communication with remote analog/digital I/O terminal modules
6. V-Net bus interconnection with operator stations, engineering stations and other control stations for system-wide data sharing
7. Onboard circular fault event, alarm and process trend data storage for long-term process traceability

Working Principle

Material & Structural Composition

• Front Panel: Black matte anodized aluminum alloy with tri-color system status LED indicators
• Circuit Board: Multi-layer FR4 industrial grade PCB with gold-plated rack backplane edge connectors
• Internal Shielding: Copper foil electromagnetic shielding layers separating analog bus and digital logic circuits
• Mechanical Chassis: Die-cast aluminum module frame with anti-vibration reinforcing ribs for rack mounting stability

Advantage Highlights

1. IEC 61508 SIL2 functional safety certification applicable for hazardous critical chemical process control loops
2. Hot standby redundant design eliminates complete control station shutdown risk for continuous production plants
3. High loop capacity of 1000 PID loops per single module reduces total rack quantity for large-scale DCS systems
4. Fast 100 ms minimum control cycle meets high-speed temperature, pressure and flow process regulation requirements
5. Built-in comprehensive advanced control algorithm library cuts custom programming workload for process engineers
6. Centum VP native bus architecture ensures seamless data synchronization with all Yokogawa DCS system peripheral equipment

Applicable Industries

Installation Requirements

• Mounting Standard: Vertical card insertion into dedicated Centum VP control station rack CPU slot, fixed via front panel captive screws
• Redundancy Layout: Redundant pair CP345 modules must occupy adjacent paired rack CPU slots
• Rack Environmental Control: Cabinet temperature strictly maintained between 0°C ~ 55°C with air conditioning cooling
• Backplane Wiring: No loose metal debris allowed inside rack backplane connector slots during module replacement

Operation & Maintenance Notes

1. Full control logic program backup to engineering station storage required every monthly maintenance cycle
2. Redundancy switchover function test must be executed every 6 months to verify fault standby performance
3. Visual inspection of front panel status LEDs every shift to detect early module communication or power faults
4. Module hot swapping is only permitted for standby redundant CP345 unit; primary running module power cut will cause process control interruption
5. Calibration verification of connected I/O modules must coordinate with CP345 control loop parameter re-tuning after annual instrument calibration