ABB PM581-ETH Ethernet CPU

Product Overview

The ABB PM581-ETH is a high-performance central processing unit belonging to the premier AC500 PLC series. It is specifically engineered for distributed automation systems that demand robust networking and flexible communication. With its built-in Ethernet interface, the PM581-ETH enables seamless integration into factory networks, supporting high-speed data exchange and remote programming.

Technical Specifications

• Manufacturer: ABB

• Model Number: PM581-ETH

• Product Series: AC500

• Program Memory: 256 kB Flash EPROM

• User Data Memory: 416 kB

• Communication Interfaces:

• Ethernet: 1 x RJ45 Port (Modbus TCP, TCP/IP, UDP)

• Serial: 2 x RS232 / RS485 (Configurable)

• FieldBusPlug (FBP): Supported for flexible fieldbus integration

• User Interface: Integrated LCD Display with 8 function keys

• Storage Expansion: Dedicated SD Card Slot for data logging and firmware updates

• Power Supply: 24 V DC (via Terminal Base)

• Protection Rating: IP20

• Operating Temperature: 0°C to +60°C

• Dimensions: Standard modular width (67.5 mm)

Core Advantages & Connectivity

The PM581-ETH is a versatile hub for modern automation:

• Integrated Networking: The native Ethernet port allows for Modbus TCP communication, enabling the PLC to communicate directly with HMIs, SCADA systems, and other controllers without additional hardware.

• Scalable Memory: While 256 kB handles significant logic, the SD card slot provides a cost-effective way to store large historical data logs or perform easy field upgrades of the user program.

• Rich Serial Connectivity: Dual configurable RS232/RS485 ports ensure compatibility with legacy devices, barcode readers, and serial Modbus RTU networks.

• Professional Diagnostics: The onboard LCD screen provides immediate onsite transparency, allowing maintenance teams to verify IP addresses, check system health, and view error codes without a PC.