The Yokogawa CP334D S3, also cataloged as the CP334D Processor Module, operates as a dedicated hardware component for synchronous hot-standby operation and dual-CPU fault detection within high-availability CENTUM CS DCS platforms.
Hardware Specifications
Parameter
Specification
Model
CP334D S3
Brand
Yokogawa
Origin
Japan
Weight
1.2 kg
Dimensions
Standard FCS slot width
Operating Temp
0 to 55 deg C
Power Consumption
System backplane powered
Memory Capacity
12 MB RAM (with ECC)
CPU Architecture
Dual-CPU card configuration
Fault Detection
Hardware Watchdog Timer & Result Comparison
DCS Process Control & Signal Conditioning Specifications
4-20 mA HART Loop Protocol Processing: Integrates directly with analog I/O field channels, routing HART dynamic variables and execution data across system buses without interrupting active PID loops.
FOUNDATION Fieldbus & Subsystem Interfacing: Manages deterministic communication cycles across fieldbus cards, using auto-program copy logic to keep duplex processor memory states synchronized.
Channel-to-Channel Isolation & Dual-CPU Execution: Features two CPUs performing identical computations with result comparison to isolate hardware faults and trigger immediate fallback execution.
Frequently Asked Questions
Q: How does the dual-CPU architecture on the Yokogawa CP334D S3 handle fault detection?
A: Both CPUs on the card execute identical computations in parallel and compare results continuously; any discrepancy or Watchdog Timer timeout immediately isolates the fault.
Q: Is error correction supported on the internal system memory?
A: Yes, the 12 MB RAM architecture includes built-in Error-Correcting Code (ECC) memory to automatically correct single-bit memory faults.
Field Installation Guidelines
Module Installation & Retention: Insert the card into the assigned Field Control Station (FCS) rack slot. Engage the retaining latches and tighten the lock screws to maintain grounding continuity.
Wiring & Shielding Limits: Ground signal cable shields at a dedicated system earth bar. Keep field wiring isolated from AC power distribution lines to prevent high-frequency noise interference.
Thermal Management: Maintain a minimum 50 mm clearance above and below the card cage to facilitate natural air circulation across heatsinks during continuous operational cycles.
