Description
The Yokogawa CP451-51 is a high-performance Field Control Station (FCS) Processor Module designed for the CENTUM VP Integrated Production Control System. It serves as the “brain” of the AFV30 or AFV40 field control units, executing complex regulatory control, sequence control, and arithmetic calculations for large-scale industrial processes.
Product Parameters (Datasheet)
- Model Number: CP451-51
- Series: CENTUM VP
- Processor Type: Vnet/IP High-Speed Processor
- Redundancy: Supports Dual-Redundant configuration (Pairing two CP451 modules)
- Memory: High-capacity Error-Correcting Code (ECC) RAM
- Communication Interface: Vnet/IP (1 Gbps)
- Maximum Control Loops: Up to 256 (Depending on configuration and scan rate)
- Power Consumption: Approx. 15 Watts
- Operating Temperature: 0°C to 50°C (Standard)
- Scan Period: 50 ms, 100 ms, 200 ms, 500 ms, 1 s (User selectable per loop)
YOKOGAWA CP451-51
YOKOGAWA CP451-51
YOKOGAWA CP451-51
Country of Origin
This high-integrity control processor is engineered and manufactured by Yokogawa Electric Corporation in Japan.
Application Fields
The CP451-51 is utilized in mission-critical environments where high availability and safety are mandatory:
- Petrochemical Refineries: Managing continuous distillation and cracking processes.
- LNG Liquefaction: Controlling cryogenic cooling loops and gas compression.
- Pharmaceutical Batching: Executing complex recipes with strict adherence to FDA standards.
- Thermal Power Plants: Governing boiler feed-water and turbine coordination.
- Pulp & Paper: Synchronizing massive wet-end and drying sections.
Product Usage Instructions
- Chassis Installation: Slide the CP451-51 into the dedicated CPU slots (typically slots 1 and 2) of a CENTUM VP Field Control Unit (e.g., AFV30D).
- Redundancy Pairing: For dual-redundant operation, two modules must be installed. They will automatically perform “state-matching” to ensure a bumpless transfer in case of a hardware failure.
- Vnet/IP Connection: Connect the ESB bus or Vnet/IP cables to the corresponding interface modules. Ensure the network topology follows Yokogawa’s Vnet/IP standards to maintain 1 Gbps performance.
- Firmware & Engineering: Use the System View software within CENTUM VP to define the control station type and download the application database.
- Lithium Battery: Check the battery status LED. The battery maintains the program memory during power-down; ensure it is replaced according to the maintenance schedule.
Product Technical Description
The CP451-51 represents the transition of the CENTUM series to the Vnet/IP high-speed control network. It uses a sophisticated microprocessor that allows for much higher calculation densities compared to older “CP” series modules. Technically, it operates on a “Pair & Spare” internal architecture; inside a single CP451-51, two microprocessors execute the same code simultaneously and compare results. If a discrepancy is found, the module triggers a fail-safe state and transfers control to the redundant partner module. This “quad-redundancy” (dual processors in dual modules) is the foundation of Yokogawa’s reputation for extreme reliability.
Q&A (Common Questions)
Q: Can a CP451-51 be used to replace an older CP401 or CP451-11? A: While the CP451-51 is a direct successor, it requires the Vnet/IP infrastructure. Upgrading from older Vnet modules may require a software revision update and database conversion in System View.
Q: What does the suffix “-51” indicate? A: This suffix typically denotes a specific hardware revision or feature set, such as the amount of user memory or specific country-of-origin standards.
Q: Does this module support HART data pass-through? A: Yes, when paired with the appropriate I/O modules (such as the AAI series), the CP451-51 can process and transmit HART digital variables to asset management software (PRM).
Q: How do I know which module is “Active” in a redundant pair? A: The front panel features a “STATUS” LED. A steady green light on one and a flashing green on the other (or specific ACT/STBY LEDs) indicates the current role of the processor.
Similar Model Recommendations
- Yokogawa CP451-11 (Earlier Vnet/IP variant)
- Yokogawa CP461 (High-performance variant for AFV40)
- Yokogawa AFV30D (Dual-redundant Field Control Unit)
- Yokogawa AAI143 (Compatible Analog Input Module)
- Yokogawa AAI543 (Compatible Analog Output Module)
For technical assistance or to request a quote for the Yokogawa CP451-51, please contact our automation specialists.
