YOKOGAWA CP345 Modules – CP345 S1

Technical Dossier

Product Details And Specifications

YOKOGAWA CP345 Series Technical Notes

The Evolution of CP345 Architecture

The CP345 series traces its lineage to YOKOGAWA's CENTUM CS platform introduced in the mid-1990s, which established the V-net optical bus as the backbone for high-speed, deterministic controller-to-controller communication. The transition to CENTUM CS 3000 in the early 2000s brought the CP345 into widespread deployment, introducing a 100 Mbps Ethernet-based control bus (Vnet/IP in later revisions) alongside the legacy coaxial V-net. The CP345 S1 operates on the ESB (Extended Station Bus) backplane, communicating with I/O modules via a proprietary high-speed serial bus at scan cycles as fast as 100 ms.

As CENTUM VP succeeded CS 3000 from approximately 2008 onward, YOKOGAWA maintained backward compatibility at the FCS level, allowing CP345-based stations to coexist within VP-managed domains under specific firmware and engineering tool constraints. The CP345 series entered its mature/end-of-active-production phase by the mid-2010s, with YOKOGAWA transitioning new projects to the CP461 and CP451 processor families. However, the CP345 remains in active service at thousands of installed sites globally, making long-term spare parts availability and lifecycle extension support a primary operational concern for plant maintenance engineers.

CP345 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the YOKOGAWA CP345 and directly associated CENTUM CS 3000 / CENTUM VP FCS module ecosystem. Models are classified by functional category.

Processor / CPU Modules

• CP345 S1: Standard single-processor FCS controller module for CENTUM CS 3000 / VP field control stations.
• CP345 D1: Dual-redundant processor module pair configuration for high-availability FCS deployments.
• CP345 S3: Enhanced single-processor variant with expanded memory capacity for large-scale control applications.

Power Supply Modules

• PW481: 24 VDC input power supply module for FCS node power distribution.
• PW482: Redundant power supply module for dual-feed FCS configurations.
• PW484: High-capacity power supply supporting expanded I/O node configurations.

Analog Input (AI) Modules

• AAI141-S00: 16-channel 4–20 mA analog input module with HART communication support.
• AAI143-S00: 8-channel high-accuracy analog input module for precision measurement loops.
• AAI841-S00: 16-channel analog input module with dual-redundant field wiring capability.

Analog Output (AO) Modules

• AAO141-S00: 8-channel 4–20 mA analog output module with HART pass-through.
• AAO841-S00: 8-channel redundant analog output module for critical control valve applications.

Digital Input (DI) Modules

• ADV151-P00: 32-channel 24 VDC digital input module for discrete signal acquisition.
• ADV157-P00: 32-channel digital input module with contact input configuration.

Digital Output (DO) Modules

• ADV161-P00: 16-channel 24 VDC digital output module for solenoid and relay driving.
• ADV167-P00: 16-channel digital output module with enhanced current sourcing capacity.

Communication / Bus Modules

• ACM12: FOUNDATION Fieldbus H1 communication module for FCS fieldbus segment integration.
• ACM11: PROFIBUS DP communication adapter for third-party device integration within FCS.
• ESB Bus Master (EB401): Extended station bus master module managing I/O node communication topology.

Quality Control for the CP345 Range

The CP345 processor and its associated I/O modules present specific technical challenges during quality verification due to the proprietary nature of the ESB backplane communication protocol and the V-net/Vnet-IP bus interface. DriveKNMS applies a structured test protocol for all CP345 series units: