PM57 | ABB AC500 Series | PLC CPU Module

Product Overview

The PM57 is a compact central processing unit designed for the AC500 programmable logic controller platform from ABB. As the core control unit of an AC500 system, it executes user logic, manages communication tasks, and coordinates distributed I/O.
This CPU is intended for automation systems that demand stable real-time behavior, modular scalability, and long-term operational reliability in industrial environments.

Controller Architecture and Performance

The PM57 belongs to the AC500 mid-range CPU class and integrates a high-speed processor optimized for deterministic control cycles. It supports cyclic, event-driven, and time-critical control tasks, making it suitable for both discrete manufacturing and continuous process control.

Internal memory resources are sized for medium-complexity applications, including logic programs, data handling, diagnostics, and communication buffers. Program execution and I/O refresh are tightly synchronized to ensure predictable system response.

Communication Interfaces

The PM57 provides native support for industrial communication networks commonly used in AC500 installations. Ethernet connectivity enables controller programming, diagnostics, and integration with SCADA or supervisory systems. ARCNET support allows deterministic data exchange within distributed ABB control architectures.

Depending on system configuration and expansion modules, serial communication such as RS-232 or RS-485 can be implemented for device-level integration, legacy equipment, or field instrumentation.

I/O System Compatibility

The PM57 operates with ABB AC500 local and remote I/O modules. It supports a wide range of digital, analog, and mixed-signal modules, allowing flexible system design and future expansion without changing the CPU platform.

Supported I/O families include analog input and output modules, high-density digital I/O, mixed I/O units, and communication interface modules for fieldbus integration.

Mechanical and Environmental Characteristics

The CPU module is housed in a compact industrial enclosure suitable for DIN-rail mounting inside control cabinets. Its form factor allows installation in space-constrained panels while maintaining adequate thermal performance and service accessibility.

The design complies with industrial environmental requirements for electrical noise immunity, vibration resistance, and continuous operation in automated facilities.

Technical Specifications

• Controller Type: PLC CPU module

• PLC Platform: AC500 series

• Program Memory: Approx. 512 kB (AC500 mid-range class)

• Communication: Ethernet, ARCNET

• Expansion: Supports AC500 local and remote I/O modules

• Mounting: DIN-rail

• Dimensions: 120 × 80 × 60 mm

• Weight: 1.0 kg

• Country of Origin: Sweden

Typical Application Areas

• Automated production and assembly lines

• Process control systems in water, energy, and chemical plants

• OEM machinery and skid-mounted control panels

• Distributed control systems based on AC500 architecture

FAQ

Q: Is the PM57 suitable for real-time industrial control?
A: Yes. The PM57 is designed for deterministic execution and stable cycle times within AC500 automation systems.

Q: Can the PM57 be expanded with additional I/O modules?
A: The CPU supports modular expansion using ABB AC500 local and remote I/O families.

Q: Which software is used for configuration and programming?
A: The PM57 is engineered and maintained using ABB AC500 engineering tools for programming, diagnostics, and system commissioning.