Description
YOKOGAWA SCP401-11
Technical Specifications Brand: Yokogawa Model: SCP401-11 System Compatibility: Yokogawa industrial control rack system Processing Function: Real-time control logic execution, data processing Memory: Built-in program memory and data memory Communication Interface: Internal backplane bus, external control network Operating Temperature: 0°C to +70°C Humidity: 5% to 95% non-condensing Protection Grade: IP20 cabinet mounting Mounting: Rack plug-in card type Redundancy Support: Hot standby redundant operation
Functional Features Execute user defined control logic and PID calculation in real time. Collect measurement data from I/O modules via rack backplane bus. Transmit process data and receive operation commands through control network. Continuous hardware and software self-diagnosis, report fault information to HMI station. Support hot standby redundant configuration, seamless switchover upon primary CPU failure. Store alarm logs and historical event records in non-volatile memory. Front panel LED indicators display power, run status, communication and fault alarm.
Application Scenarios Petrochemical plant DCS control system, power plant auxiliary control, water treatment plant automation, pulp and paper mill process control, chemical reactor monitoring and regulation.
Performance Parameters Fast logic scan cycle for real-time process control. High reliability continuous operation for long-term plant running. Seamless redundant switchover without control interruption. Built-in watchdog circuit prevents program runaway. High immunity against industrial electromagnetic interference.
Material Composition Front Panel: Flame retardant black ABS plastic with LED indicators. PCB: FR4 multilayer printed circuit board with conformal coating. Core Components: Industrial grade processor chip, non-volatile memory, bus communication controller. Backplane Connector: Gold plated edge connector. Terminal Block: Plastic screw terminal for network wiring.
Structural Features Plug-in card structure, rear gold finger connector inserts into rack backplane. Front panel integrates status LEDs and network connector. Side plastic locking latches secure module in rack slot. PCB layout separates backplane signal circuit and external network circuit. Internal shielding reduces signal interference between high-speed circuits.
Working Principle SCP401-11 CPU reads process data from I/O modules over rack backplane bus. Processor executes user control program and PID algorithm to generate output commands for field actuators. The module exchanges process data and operation commands with operator stations and other controllers via external control network. Self-diagnosis circuit monitors hardware state continuously. In redundant setup, backup CPU synchronizes all data with primary CPU and takes over control immediately once primary CPU fails.
Installation Requirements Power off rack before inserting module into designated CPU slot. Lock side latches to fix module in rack. Connect control network cable to front panel network port. Use shielded twisted pair cable for network wiring with single point shield grounding. Download control program and configuration parameters after power on. Keep ventilation clearance inside rack for heat dissipation.
Usage Notes Wear anti-static wristband during module replacement. Do not apply overvoltage to communication terminals. Check network cable shielding and grounding. Prevent cabinet condensation which causes PCB leakage. Backup control program before module maintenance.
