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ABB 560CMU05
The ABB 560CMU05 is a Central Communication Unit (CMU) designed for the ABB RTU560 Remote Terminal Unit platform. It serves as the central processing and communication module of an RTU system, acting as the bridge between field I/O modules, intelligent electronic devices (IEDs), local HMI systems, and supervisory control systems (SCADA).
In an RTU560 architecture, the 560CMU05 is positioned as the system communication core, responsible for:
- Data acquisition management
- Event processing
- Protocol conversion
- Remote communication
- System configuration management
- Interface control between field equipment and control centers
It is mainly applied in substation automation, power distribution automation, industrial monitoring, and energy infrastructure control systems.
2. Product Parameters
| Parameter |
Specification |
| Product Model |
ABB 560CMU05 |
| Product Family |
ABB RTU560 |
| Product Type |
Communication Unit / Central Processing Module |
| CPU |
32-bit processor (ELAN520 @ 133 MHz, Intel 586 class) |
| RAM |
64 MB |
| Flash Memory |
128 MB CompactFlash / non-volatile memory |
| Serial Interfaces |
Up to 4 × RS232C / RS485 configurable |
| Ethernet Interfaces |
2 × 10/100BaseT Ethernet (RJ45) |
| Serial Communication Speed |
Up to 38.4 kbit/s (RS232), RS485 typically up to 19.2 kbit/s |
| Backplane Interface |
DIN 41612 48-pin connector |
| Operating Voltage |
Supplied through RTU560 backplane |
| Power Consumption |
Approx. 5 V DC / 1060 mA |
| Mechanical Format |
3HE Euro-card format |
| Dimensions |
Approx. 160 × 100 mm |
| Weight |
Approx. 0.3 kg |
| Configuration Storage |
Non-volatile Flash memory |
| Diagnostic Function |
LED status indication + Ethernet diagnostic functions |
3. Core Functions
3.1 RTU System Control
The 560CMU05 manages the RTU560 internal architecture:
- Controls I/O modules through the serial peripheral bus
- Collects digital and analog process information
- Processes status changes and alarms
- Sends control commands to output modules
It acts as the main controller of the RTU rack.
3.2 Communication Gateway
The module provides communication between:
- Field devices
- Protection relays
- Smart meters
- Sub-RTUs
- SCADA master stations
- Local engineering terminals
Supported communication paths include:
- Serial communication (RS232 / RS485)
- Ethernet communication
- Industrial automation protocols
3.3 Protocol Handling
Depending on configuration and firmware, the 560CMU05 can support protocols commonly used in power automation systems, such as:
- IEC 60870-5-101
- IEC 60870-5-104
- DNP3
- Modbus
- Other RTU560-supported protocols
It enables communication between legacy serial devices and modern Ethernet-based control systems.
3.4 Event Processing and Time Management
The unit provides:
- Event collection
- Sequence-of-events processing
- Time synchronization support
- Real-time clock management
This is important for fault analysis and substation event recording.
4. Design Features
4.1 Modular RTU Architecture
The 560CMU05 follows ABB RTU560 modular design:
- Plug-in card structure
- Easy replacement
- Expandable I/O architecture
- Suitable for rack-mounted automation systems
4.2 Dual Ethernet Interface Design
Two Ethernet ports provide:
- Communication redundancy options
- Connection to control centers
- Engineering access
- Network integration
The Ethernet ports support 10/100 Mbps communication.
4.3 Flexible Serial Communication
The serial ports can be configured as:
This allows integration with older field equipment and industrial instruments.
4.4 Non-Volatile Configuration Storage
System configuration files are stored in Flash memory, allowing:
- Configuration retention after power loss
- Fast system recovery
- Reliable startup operation
4.5 Integrated Diagnostics
Front-panel indicators provide information about:
- Module fault status
- Data transmission
- Data reception
- Ethernet activity
- Link status
5. Hardware Composition
The internal hardware structure mainly includes:
5.1 Main Processing Unit (MPU)
Core processor subsystem:
- ELAN520 32-bit CPU
- RAM memory
- Flash storage
Responsible for:
- Application execution
- Data processing
- Communication management
5.2 Serial Line Controller (SLC)
Dedicated communication controller:
- Handles serial channels
- Manages RS232/RS485 communication
- Provides interface buffering
5.3 Communication Interfaces
Serial Ports
Interfaces:
Functions:
- Field device communication
- I/O bus communication
- Substation equipment connection
Ethernet Ports
Interfaces:
Functions:
- SCADA communication
- Engineering access
- Network-based device integration
5.4 Memory System
Includes:
- RAM for operation
- Flash memory for firmware/configuration storage
5.5 Backplane Connector
The module connects to RTU560 racks through:
- 48-pin DIN 41612 connector
- Internal RTU communication bus
6. Application Scenarios
6.1 Electrical Substations
Typical use:
- Substation RTU
- Remote monitoring
- Breaker status collection
- Protection relay communication
- SCADA connection
6.2 Power Distribution Automation
Applications:
- Distribution network monitoring
- Feeder automation
- Remote switching control
- Fault indication
6.3 Industrial Energy Systems
Used in:
- Power plants
- Oil & gas facilities
- Mining operations
- Large industrial plants
6.4 Renewable Energy Systems
Possible applications:
- Wind farms
- Hydropower stations
- Solar power plants
Functions:
- Data acquisition
- Remote control
- Grid communication
7. Maintenance Points
7.1 Communication Inspection
Regularly check:
- Ethernet link status
- Serial communication quality
- Communication error counters
- Protocol synchronization
7.2 Configuration Backup
Recommended:
- Backup RTU configuration files
- Save firmware versions
- Document communication parameters
7.3 Environmental Maintenance
Check:
- Rack ventilation
- Dust accumulation
- Temperature conditions
- Humidity levels
Typical operating environment:
- Temperature: approximately 0–70°C
- Relative humidity: 5–95% non-condensing
7.4 Hardware Replacement
When replacing:
- Record configuration parameters
- Switch system to maintenance mode
- Remove module carefully
- Install replacement CMU
- Reload configuration
- Verify communication channels
7.5 Common Fault Symptoms
| Symptom |
Possible Cause |
| No communication |
Ethernet/serial cable fault, configuration error |
| ERR LED active |
Hardware or software fault |
| Lost SCADA connection |
Network parameter issue |
| Missing field data |
I/O bus communication problem |
| Frequent restart |
Power supply or memory issue |
8. Comprehensive Evaluation
The ABB 560CMU05 is a mature and reliable communication controller for ABB’s RTU560 automation platform.
Advantages
✔ Industrial-grade reliability
✔ Strong communication capability
✔ Supports mixed serial/Ethernet architectures
✔ Suitable for long-life power automation systems
✔ Modular and easy to maintain
✔ Good compatibility with legacy field equipment
Limitations
✘ Older CPU architecture compared with modern IEC 61850 gateways
✘ Limited processing capability for very large data applications
✘ Requires RTU560 ecosystem compatibility
Overall Assessment
The ABB 560CMU05 remains a high-reliability RTU communication core module widely suited for substation automation, power grid monitoring, and industrial remote control applications. Its strength lies in stable long-term operation, flexible communication interfaces, and proven ABB RTU560 platform integration.
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