Description
⚙️ Product Overview
The B&R X20CP3684 is a high-performance Central Processing Unit designed for the B&R X20 automation system. It serves as the main controller of a modular PLC architecture, handling program execution, process data processing, communication, and coordination between connected X20 I/O modules and automation devices.
The CPU is intended for demanding industrial automation applications that require reliable processing performance and flexible system expansion. It can be integrated into modular control systems for machinery, production lines, packaging equipment, material handling systems, and other automated industrial applications.

🔧 Key Product Features
• High-performance industrial PLC processing
• Part of the modular B&R X20 automation platform
• Supports distributed and modular I/O architectures
• Designed for machine control and automation applications
• Integrated communication capability
• Suitable for complex control programs and real-time automation tasks
• Compact DIN-rail installation
• Expandable through compatible B&R X20 modules
• Designed for continuous industrial operation
📋 Product Datasheet
🔹 Brand: B&R
🔹 Model: X20CP3684
🔹 Series: X20 System
🔹 Product Name: Central Processing Unit
🔹 Product Type: Industrial PLC CPU Module
🔹 Processor Function: Central control and program execution
🔹 Programming Environment: B&R Automation Studio
🔹 System Architecture: Modular and distributed automation system
🔹 I/O Compatibility: B&R X20 I/O Modules
🔹 Mounting Method: DIN Rail Mounting
🔹 Installation Position: Control cabinet installation
🔹 Communication Capability: Supports industrial communication functions depending on system configuration
🔹 Application Type: Machine and industrial automation
🔹 Operating Mode: Continuous industrial control operation
🔹 Expansion Capability: Compatible with modular X20 system components
🔹 Cooling Method: Natural convection
🔹 Supply Requirement: Depends on the complete X20 system configuration
🔹 Power Consumption: Depends on CPU operation and connected system configuration
🔹 Dimensions: Compact X20 modular controller format
🔹 Weight: Lightweight industrial automation module
🔹 Product Condition: New Surplus
🔹 Country of Origin: Austria / manufacturing origin may vary according to production batch
⚠️ Important Note: Exact processor specifications, memory capacity, interface configuration, supply requirements, dimensions, and weight should be confirmed using the product nameplate and the original B&R technical documentation for the specific X20CP3684 hardware revision.
🛠️ Typical Applications
The X20CP3684 can be used in a wide range of industrial automation systems.
Typical applications include:
• Packaging machinery
• Assembly machines
• Production equipment
• Material handling systems
• Conveyor control systems
• Robotic automation cells
• Printing and converting machinery
• Industrial testing equipment
• Process automation systems
• Customized machine control projects
💡 System Integration
The X20CP3684 acts as the central processing component of the automation system. It communicates with connected X20 modules and coordinates input processing, control logic, output commands, and communication tasks.
A typical system configuration may include:
• X20 digital input modules
• X20 digital output modules
• X20 analogue input modules
• X20 analogue output modules
• Communication modules
• Motion control components
• Safety modules
• Remote I/O stations
This modular structure allows engineers to build automation systems according to the exact I/O and control requirements of the machine.
🔍 Common Questions and Answers
❓ Q1: What is the function of the X20CP3684?
A: The X20CP3684 is the Central Processing Unit of a B&R X20 automation system. It executes the control program, processes system data, manages connected I/O modules, and coordinates automation and communication tasks.
❓ Q2: Can this CPU be used with other B&R X20 modules?
A: Yes. It is designed as part of the B&R X20 modular automation platform. Compatibility should still be checked according to the complete system configuration and hardware generation.
❓ Q3: What software is used to program the CPU?
A: B&R Automation Studio is used for engineering, programming, configuration, diagnostics, and system management of compatible B&R automation hardware.
❓ Q4: Is the X20CP3684 suitable for machine automation?
A: Yes. It is designed for industrial control applications and can be used in machinery requiring programmable control, modular I/O, communication, and coordinated automation functions.
❓ Q5: Can the CPU be replaced directly?
A: A replacement should be checked carefully before installation. The exact model number, hardware revision, firmware compatibility, program configuration, communication settings, and connected X20 hardware should be compared with the existing unit.
❓ Q6: What should be backed up before replacing the CPU?
A: The existing automation project, application program, communication configuration, device parameters, and other relevant engineering data should be backed up before replacement.
❓ Q7: Does the CPU require additional I/O modules?
A: The CPU can operate as the central controller, while X20 I/O modules are added according to the application’s input, output, measurement, communication, and control requirements.
🔧 Recommended B&R Models
- B&R X20CP1484 – Central Processing Unit
- B&R X20CP1584 – Central Processing Unit
- B&R X20CP1685 – Central Processing Unit
- B&R X20CP3584 – Central Processing Unit
- B&R X20CP3687 – Central Processing Unit
- B&R X20BC0083 – Bus Controller
- B&R X20DI9371 – Digital Input Module
- B&R X20DO9322 – Digital Output Module
- B&R X20AI4622 – Analogue Input Module
- B&R X20AO4622 – Analogue Output Module
📦 Product Selection Reminder
When replacing a B&R X20 CPU, the complete model number should always be checked rather than selecting a replacement only according to the X20CP series. Processor performance, memory, communication interfaces, firmware compatibility, and project configuration may vary between CPU versions.
For existing systems, it is recommended to verify the original X20CP3684 nameplate, connected modules, system power configuration, and Automation Studio project before installation. This helps reduce compatibility problems and minimizes machine downtime.
