
Foxboro CP40B Control Processor Module (P0961BC)
Product Overview
The Foxboro CP40B is a high-performance control processor module designed for the Foxboro I/A Series Distributed Control System (DCS). It serves as the central processing unit (CPU) of the control system, executing real-time control logic, managing I/O communication, and ensuring reliable plant-wide automation.
Engineered for mission-critical industrial environments, the CP40B delivers deterministic control performance, high-speed data processing, and system redundancy, making it ideal for continuous process industries.
Key Features
- High-speed industrial processor for real-time control execution
- Supports continuous and discrete control (PID loops, logic control)
- Dual Ethernet communication ports for system networking
- Advanced diagnostics and fault monitoring for system reliability
- Redundancy support (processor, power, communication) for high availability
- Large I/O capacity (up to ~8000 points depending on configuration)
- Seamless integration with Foxboro FBM modules and workstations
Technical Specifications
| Parameter |
Specification |
| Model |
CP40B (P0961BC) |
| Product Type |
Control Processor Module |
| Processor |
Industrial-grade microprocessor |
| Memory |
Up to 64 MB RAM / 16 MB Flash |
| Communication |
Ethernet, Modbus TCP/IP |
| I/O Capacity |
Up to 8000 I/O points |
| Power Supply |
24 VDC |
| Power Consumption |
<30 W |
| Operating Temperature |
–40°C to +70°C |
| Mounting |
Rack-mounted (I/A Series chassis) |
| Reliability |
MTBF > 200,000 hours |
Functions & Role in DCS
The CP40B acts as the “brain” of the Foxboro control system, responsible for:
- Executing control algorithms and logic
- Collecting and processing real-time field data
- Communicating with FBM (Fieldbus Modules)
- Coordinating operator workstations and servers
- Maintaining system synchronization and stability
It ensures fast response times and precise process control, even in complex industrial environments.
Applications
The Foxboro CP40B is widely used in industries such as:
- Power generation plants
- Oil & gas / petrochemical refineries
- Chemical processing
- Water & wastewater treatment
- Manufacturing automation
These applications require high reliability, continuous operation, and precise control, which the CP40B is designed to deliver.
Advantages
- ✔ High reliability for 24/7 industrial operations
- ✔ Scalable for small to mid-sized control systems
- ✔ Strong compatibility with legacy and modern Foxboro systems
- ✔ Supports redundancy for critical processes
- ✔ Cost-effective compared to higher-end processors (e.g., CP60)
Conclusion
The Foxboro CP40B Control Processor Module is a proven and reliable solution for industrial automation systems. With its robust processing capability, flexible communication, and fault-tolerant design, it remains a key component in maintaining efficient and stable plant operations.

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Our Main Brand
ABB, GE, Allen Bradley, Honeywell, Emerson, Bently Nevada, Prosoft, Siemens, Westinghouse, Triconex, Foxboro, ICS Triplex, Hima, Schneider, Yokogawa, Woodward, B&R, KEBA, etc
—-(DCS)Distributed Control System
ABB 3AUA0000110429,SYSCON2 746924
Invensys Foxboro FBM214,FBM242,B0123HE
Invensys Triconex 3625,3700A,3604E
Woodword 5462-758B
HIMA F2-DO-16-02,F8650E
Yokogawa SAI143-S03 S1, F9342L-02
Honeywell 51402497-200,51403519-160,51199194-100,CC-PDO801
Emerson KJ4001X1-NB1,12P3368X012
—-(PLC)Programmable Logic Controller
Rockwell AB 1734-IB8,1734-OB8,1769-L18ER-BB1B,1756-IM16I
ICS Triplex T8461,T8850,T8403,T8431,T8831,T8310
Schneider Modicon 140DDI85300
GE Fnauc IS210AEPSG2B,IS220UCSAH1A,IS215ACLEH1A,IS210AEAAH1B
Siemen 6ES7331-1KF02-0AB0
Prosoft MVI46-DFNT
Bachmann MPC240
Woodhead 9905-068 2301A
—-(TSI)Turbine Supervisory Instrumentation
Bently Nevada 3500/22M,138607-01,3500/25,3500/53,3500/32M 149986-02,
EPRO MMS6110,MMS6120,MMS6220,MMS6312,MMS6410,6423,6424,
ENTEK EK C6622HS,XM124,1440-SDM02-01RA

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