The ABB PM581-ETH 1SAP140100R0170, also cataloged as the PM581-ETH Central Processing Unit, operates as a dedicated hardware component for real-time logic execution and network communication within AC500 Series environments.

Part Number Structuring & Variant Mapping

The hardware ordering code maps directly to the specific execution processor revision and interface options:

• PM581-ETH: Base central processing unit designation incorporating integrated Ethernet network capability.
• 1SAP140100R0170: Standard production catalog code for the 256 kB program memory CPU hardware unit.
• AC500: System platform series defining the backplane interface, terminal base compatibility, and I/O expansion rules.

Hardware Specifications

Backplane Communication Velocity & Network Determinism

The PM581-ETH 1SAP140100R0170 manages rapid data throughput across the local system backplane bus, driving input and output refresh cycles with minimal transmission overhead. Integrated onboard Ethernet supports high-speed connection into Profinet and EtherNet/IP deterministic networks to handle real-time field data distribution. Firm firmware flash compatibility maintains uninterrupted memory execution and preserves structured data blocks across system power resets.

Delivery Package Inventory

• 1 x ABB PM581-ETH 1SAP140100R0170 Central Processing Unit Module

Physical Mount & Field Wiring Framework

• Mount the terminal base onto a standard TH35-15 DIN rail (35 mm x 15 mm) before sliding the CPU into place.
• Horizontal orientation is recommended for optimal convection cooling; vertical mounting requires thermal power derating.
• Connect regulated 24 VDC power directly to the terminal base power terminals following correct line polarity.
• Attach up to 10 local expansion I/O modules directly to the right side of the CPU terminal base assembly.

Technical FAQ

• Q: What is the maximum local I/O module expansion capacity for the PM581-ETH CPU?

  A: A maximum of 10 local I/O expansion modules can be attached directly to the right side of the CPU terminal base.

• Q: How is user program code retained on the module during power-down cycles?

  A: The CPU utilizes 256 kB of non-volatile Flash EPROM memory to retain user application logic permanently without battery backup.

• Q: What input supply voltage is required to power the terminal base and processor?

  A: The CPU operates on a nominal supply voltage of 24 VDC connected via the designated terminal base power terminals.

• Q: What communication interfaces are integrated into the main physical CPU body?

  A: The hardware features an integrated Ethernet port, two serial interfaces (RS232/RS485), an FBP interface, and an SD card slot.

• Q: Can the module be mounted vertically inside a control cabinet?

  A: Yes, vertical mounting on TH35-15 DIN rails is supported, but operational ambient temperature limits may require derating.

• Q: Does the processor support live hot-swapping on the terminal base?

  A: No, control supply power must be completely disconnected before removing or inserting the CPU module into its base unit.

• Q: What altitude limitation applies to the standard installation environment?

  A: The permissible maximum operating altitude without secondary environmental compensation is 2000 meters above sea level.

• Q: What type of memory is designated for runtime user data storage?

  A: The processor allocates 416 kB of internal memory dedicated to handling active runtime user data structures.