Yokogawa CENTUM VP CP-Series Modules: CP11*C ASS9291AS-0

Technical Dossier

Product Details And Specifications

Yokogawa CENTUM VP CP-Series Technical Notes

The Yokogawa CENTUM VP CP-series represents the central processing and field control station (FCS) hardware backbone of Yokogawa's flagship Distributed Control System (DCS) platform. Deployed across the global process industries—including petrochemical complexes, LNG terminals, nuclear power facilities, offshore platforms, and large-scale refinery units—the CENTUM VP architecture has accumulated an installed base measured in tens of thousands of field control stations worldwide. The CP-series CPU modules govern real-time process execution, redundancy management, and inter-station communication within the CENTUM VP FCS chassis. Their deterministic scan cycle, hardware-enforced redundancy switching, and compliance with IEC 61511 functional safety requirements make them the reference standard for safety-critical continuous process control. The CP11*C ASS9291AS-0 is a representative CPU module within this lineage, designed for integration into the CENTUM VP FCS rack environment and compatible with the Vnet/IP control network.

The Evolution of CENTUM VP CP-Series Architecture

Yokogawa's CENTUM DCS platform has evolved through four major architectural generations since its introduction in the 1970s. The original CENTUM system (1975) established the distributed field station concept. CENTUM-XL (1987) introduced digital communication between engineering workstations and field stations. CENTUM CS (1993) migrated to a Windows-based HIS (Human Interface Station) and introduced the first generation of modular CPU cards with standardized backplane interfaces. CENTUM CS 3000 (1998) consolidated the FCS hardware into the current rack-and-module form factor, introducing the CP345, CP333, and CP401 processor families with dual-redundant CPU configurations.

CENTUM VP (2008–present) represents the current generation, retaining backward hardware compatibility with CS 3000 I/O modules while introducing the Vnet/IP Ethernet-based control network (replacing the earlier V-net coaxial bus), enhanced CPU processing throughput, and integrated safety instrumented system (SIS) support via ProSafe-RS integration. The CP451, CP461, CP471, and CP481 families are the primary CPU modules for CENTUM VP FCS. The CP11*C (ASS9291AS-0) belongs to the earlier CS-era processor lineage and is now classified as a mature/end-of-life component, meaning Yokogawa no longer manufactures it as a standard catalog item. Long-term maintenance support for installed base units depends on the secondary market and specialist distributors.

CENTUM VP CP-Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the Yokogawa CENTUM VP and CENTUM CS 3000 CP-series ecosystem. Each entry reflects a distinct hardware function within the FCS architecture.

CPU / Field Control Station Processors

• CP11*C ASS9291AS-0: CENTUM CS-era FCS CPU module; single-slot processor card for legacy rack integration.
• CP345-D: Dual-redundant FCS CPU for CENTUM CS 3000; supports up to 2,048 I/O points per station.
• CP345-E: Enhanced variant of CP345-D with extended memory and faster scan cycle execution.
• CP333-D: Mid-range FCS CPU for CENTUM CS 3000; single or dual-redundant configuration.
• CP401-50: High-capacity FCS CPU for CENTUM CS 3000 large-scale applications; 50 ms minimum scan cycle.
• CP451-10: CENTUM VP FCS CPU; Vnet/IP native; 10 ms minimum scan cycle; supports dual-redundant configuration.
• CP451-50: CENTUM VP FCS CPU; 50 ms scan cycle variant; standard process control applications.
• CP451-E0: Enhanced CP451 with extended I/O capacity and integrated self-diagnostic functions.
• CP461-10: High-speed CENTUM VP FCS CPU; 10 ms scan; suited for fast-loop control in refinery applications.
• CP461-50: Standard-speed variant of CP461; 50 ms scan cycle; broad process industry deployment.
• CP471-10: Top-tier CENTUM VP FCS CPU; supports up to 10,000 I/O tags; 10 ms scan cycle.
• CP471-50: CP471 family, 50 ms scan cycle; large-scale DCS configurations.
• CP481-50: Highest-capacity CENTUM VP FCS CPU; supports redundant Vnet/IP and SIS integration.
• CP9200SH: CENTUM CS-era supervisory CPU; used in multi-domain CENTUM CS architectures.
• CP9201SH: Enhanced supervisory CPU for CENTUM CS; extended inter-domain communication capacity.
• CP9211SH: Advanced supervisory processor; supports large multi-FCS CENTUM CS installations.

Analog I/O Modules

• AAI143-S00: 16-channel analog input module; 4–20 mA; HART-compatible; for CENTUM VP FCS.
• AAI841-S00: 8-channel analog output module; 4–20 mA; HART pass-through; FCS rack-mount.

Digital I/O Modules

• ADV151-P00: 32-channel digital input module; 24 VDC; for CENTUM VP FCS field I/O nodes.
• ADV551-P00: 32-channel digital output module; 24 VDC; transistor output; FCS rack-mount.