Description
Yokogawa SCP451-51
Technical Specifications: Power supply: 24 VDC CPU: 32-bit RISC processor Memory: SRAM program memory, flash non-volatile storage Communication bus: V-net for control station network I/O bus: ESB bus for local I/O connection Operating temperature: 0 ℃ to 60 ℃ Storage temperature: -20 ℃ to 70 ℃ Relative humidity: 5% to 95% non-condensing Mounting: rack slot mount
Functional Features: Real-time control execution for regulatory and sequence control. Redundant CPU configuration with automatic switchover. V-net communication for station network. ESB bus connection for local I/O nodes. Built-in self-diagnostic routines. Status LEDs for power, run, alarm and redundancy. User program download through engineering workstation. Watchdog timer for CPU fault detection.
Application Scenarios: Large refinery DCS control station, petrochemical plant process control, power plant turbine control system, chemical plant batch control, offshore platform control system.
Performance Parameters: Control scan cycle: 500 ms typical V-net communication speed: 10 Mbps Redundancy switchover time: less than 100 ms Power consumption: 12 W typical
Material Composition: Module housing: UL94-V0 flame-retardant plastic. PCB: FR-4 glass fiber epoxy. Backplane connector: gold-plated copper alloy. Locking latches: die-cast zinc alloy.
Structural Features: Rack plug-in module form factor. Front panel with LCD display and LED status indicators. Locking screws on both sides. Rear high-density backplane connector. Internal memory modules accessible from top cover.
Working Principle: The processor downloads user control program from engineering workstation. It executes program cyclically, reading process values from I/O modules via ESB bus. Control calculations generate output commands written to I/O modules. V-net communicates with other stations and human interface stations. In redundant configuration, two CPUs synchronize data continuously; standby CPU takes over immediately if active CPU fails.
Installation Requirements: Install in designated slot of field control station rack. Lock both side screws. Connect V-net and ESB bus cables. Ensure rack grounding is complete. Reserve ventilation space around module.
Precautions for Use: Do not insert or remove module with rack power on. Wear anti-static wristband. Back up user program before replacement. Do not expose module to direct sunlight. Keep cabinet temperature within specified range. Configure redundancy parameters during commissioning.
