Product Overview

The SCP461-51 S1 (Model: SCP461-51) is a high-performance Sequence Control Processor (SCP) dedicated to the Yokogawa CENTUM VP and CENTUM CS 3000 Distributed Control Systems (DCS). While standard control processors are primarily optimized for continuous PID loops, the SCP461-51 S1 (Part Number: SCP461-51) is engineered to manage discrete state transitions, complex sequential logic, and safety interlocks. It serves as the logical brain for Field Control Stations (FCS) that oversee batch processing, turbine start-up/shut-down sequences, and critical protective per-missives.

The SCP461-51 S1 hardware revision features upgraded internal architecture for improved thermal management and long-term signal stability. Designed for mission-critical reliability, this module supports 1:1 dual-redundant (Duplex) configurations. In this mode, the primary and secondary units synchronize sequence steps and internal variables in real-time, enabling a "bumpless" transfer of control. If a hardware fault occurs, the standby card takes over without resetting process timers or interrupting sequence progress, which is vital for high-value batch production in the pharmaceutical and chemical sectors.

Detailed Technical Specifications

The SCP461-51 S1 provides specialized memory and processing for deterministic sequence execution.

• Manufacturer: Yokogawa Electric Corporation

• Model Number: SCP461-51

• Hardware Style: S1 (Optimized Revision)

• System Series: CENTUM CS 3000 / CENTUM VP

• Product Type: Sequence Control Processor Card

• Primary Function: Discrete Logic, Interlocking, and Batch Sequence Execution

• Redundancy: Supports Dual-Redundant (Duplex) operation for high availability

• Bus Interface: Vnet/IP for real-time data synchronization and coordination

• Onboard Memory: High-capacity RAM and non-volatile Flash for sequence tables

• Sequence Speed: Optimized for high-speed scanning of digital states and state-based logic

• Input Voltage: 24 VDC (Supplied via the FCS backplane)

• Power Consumption: Approx. 12-18W depending on operational load

• Operating Temperature: 0°C to +60°C (32°F to 140°F)

• Storage Temperature: -40°C to +85°C

• Dimensions: 200 mm $\times$ 150 mm $\times$ 25 mm

• Net Weight: 0.7 kg (1.54 lbs)

• Manufacturing Origin: Japan