Product Overview

The ABB CM574-RS (Order Number 1SAP170400R0201) is a high-performance CPU coprocessor designed to extend the computational and communication capabilities of the AC500 PLC platform. This module functions as a dedicated serial communication processor, offloading intensive data exchange tasks from the main CPU to ensure deterministic system performance. By managing independent serial protocols and complex data strings, the CM574-RS facilitates high-speed interfacing between the controller and diverse field devices. Its integration into the AC500 architecture allows for simultaneous multi-protocol processing, making it an essential component for distributed control systems requiring high availability and low-latency communication.

Technical System Architecture and Hardware Profiles

• Model Number: CM574-RS

• Identification Code: 1SAP170400R0201

• Component Category: CPU Coprocessor / Communication Module

• Net Weight: 0.5 kg

• Module Dimensions: 9.5 x 9.5 x 14.6 cm

• Serial Interfaces: Multiple RS-232 / RS-485 programmable ports

• Product Origin: Sweden

• System Series: AC500 Control System

• Customs Tariff: HS 8537101190

• Network Support: Integrated Ethernet router and serial gateway services

The hardware is built with an industrial-grade housing designed for standard DIN rail mounting. It features independent diagnostic LEDs for each communication channel, allowing for rapid localized troubleshooting without disrupting the primary control loop.

Industrial Applications and Deployment Scenarios

The CM574-RS is strategically deployed in complex automation environments where the primary PLC requires specialized serial data handling. Common use cases include:

• Energy Sector Automation: Interfacing with legacy protection relays, power meters, and specialized serial-based sensors in electrical substations.

• Complex Manufacturing Systems: Coordinating real-time data flow between the AC500 PLC and third-party barcode scanners, printers, or weighing scales.

• Process Control Infrastructure: Managing long-distance serial communication in water treatment facilities or oil and gas extraction sites.

• DCS Integration: Serving as a dedicated gateway to bridge serial fieldbus devices into a modern Ethernet-based Distributed Control System.

FAQ

Q: What is the primary advantage of adding a CM574-RS coprocessor to an AC500 system?

A: The primary benefit is the separation of communication tasks from logic execution. By handling serial protocols on the CM574-RS, the main PLC CPU can maintain faster and more consistent scan times for critical control tasks.

Q: Does this module require separate software for configuration?

A: Configuration is performed within the standard ABB Automation Builder environment, where the coprocessor is integrated into the hardware tree and its serial parameters are defined.

Q: Can the RS-interface ports be configured for different protocols simultaneously?

A: Yes, the CM574-RS is highly flexible and can be programmed to handle different serial protocols across its available ports, allowing for the connection of varied device types.

Q: Is the CM574-RS compatible with all AC500 CPU models?

A: It is compatible with the standard AC500 range that supports communication module expansion. It is recommended to verify the power consumption limits of your specific terminal base and CPU.

Q: How does the coprocessor handle error detection during data transmission?

A: The module features hardware-level parity checks and checksum verification, alongside diagnostic flags that report communication timeouts or frame errors directly to the main processor.