ABB CM574-RS Dual Serial Communication Module
Two isolated software-configurable serial channels support programmed data exchange in an AC500 V2 controller system.
Product Profile
CM574-RS is an ABB AC500 communication module with two serial interfaces and its own PowerPC processor. Each channel can be wired for RS-232 or RS-485 according to the electrical connection, while the application defines the protocol behavior. The module is supplied with the matching removable terminal blocks.
Technical Data
| Manufacturer | ABB |
|---|---|
| Article Number | 1SAP170400R0201 |
| Product Family | AC500 |
| Interfaces | 2 serial channels, EIA RS-232 or EIA RS-485 |
| Protocol Method | Freely programmable; Modbus and ASCII examples supported |
| Operating Modes | Programming or data exchange |
| Transfer Rate | 9.6 kbit/s to 187.5 kbit/s |
| CPU Isolation | 500 V DC potential separation |
| Interface Connector | 9-pin male MC 0.5/9-G-2.5 |
| Processor | PowerPC |
| Internal RAM | 256 kB |
| Flash Memory | 512 kB firmware plus 2 x 64 kB user data |
| Communication Memory | 8 kB dual-port memory |
| Typical Current Consumption | 80 mA from the 24 V DC terminal-base supply |
| Included Terminals | Two TA532 9-pin spring-type terminal blocks |
| Lifecycle | Active |
System Role
- Handles serial protocol logic independently through its onboard processor.
- Connects the module application to the AC500 CPU through dual-port memory.
- Allows COM1 and COM2 to support separate serial communication tasks.
- Provides PWR, RDY, RUN, STA and ERR indications for local diagnosis.
- Enables custom serial processing when a fixed protocol module is not appropriate.
Compatibility
- ABB specifies PM57x, PM58x and PM59x CPUs for the module.
- Use an AC500 TB5xx terminal base that supports the communication-module interface.
- Wire each serial port for the intended RS-232 or RS-485 electrical standard.
- Retain the Automation Builder application and serial parameters for service replacement.
- Do not treat CM574-RCOM as the same article; its role and order number are different.
Applications
- Modbus RTU communication with drives, meters or remote devices.
- ASCII message exchange with barcode readers, instruments or custom equipment.
- Two independent serial links in one controller station.
- Protocol conversion logic implemented in the module application.
- Maintenance of installed AC500 V2 systems that use the CM574-RS processor architecture.
FAQ
Can COM1 and COM2 use different serial tasks?
Yes. The two interfaces can be configured for separate communication duties within the programmed application.
How is RS-232 or RS-485 selected?
The electrical connection and software settings must correspond to the intended interface standard.
Why does CM574-RS include its own processor?
The onboard processor supports freely programmable serial communication and local data handling.
Which terminal hardware is normally supplied?
ABB specifies two TA532 removable spring-type terminal blocks with the module.
What must be preserved for a like-for-like replacement?
Save the Automation Builder application, port settings, protocol logic and CPU data mapping.
Which diagnostic indicators should be reviewed first?
Use the power, readiness, run, station and error LEDs to identify the operating state.
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