ABB CM574-RCOM 1SAP170401R0001 Serial communication module

Description

ABB CM574-RCOM 1SAP170401R0001 Serial communication module

Product Overview

The ABB CM574-RCOM (Part No. 1SAP170401R0001 / 1SAP170401R0201) is a specialized communication module belonging to the ABB AC500 PLC product family. It is designed with two independent serial communication interfaces supporting the dedicated RCOM / RCOM+ protocol.

Operating as an intelligent sub-CPU or communication coupler, it handles specialized serial data exchanges, reducing the processing load on the main CPU while allowing seamless integration into legacy industrial networks utilizing ABB’s RCOM protocol.

Technical Specifications

Key Advantages

• Dedicated Protocol Support: Built specifically for RCOM/RCOM+ network environments, ensuring compatibility with legacy telemetry and remote control infrastructures.
• Reduced Main CPU Load: Functions with its own processor and dual-port memory to manage heavy serial communication tasks independently from the central PLC processor.
• Flexible Serial Connectivity: Provides two independent channels configurable for either RS-232 or RS-485 standards depending on physical field requirements.
• Galvanic Isolation: Features 500 V DC electrical isolation from the CPU base, protecting system logic from electrical noise and ground loops in industrial environments.
• Modular Integration: Easily snaps onto standard AC500 terminal bases and mounts on standard 35 mm DIN rails.

Important Usage & Installation Precautions

• Lifecycle Status: Modules in the RCOM series often fall under the “Classic” lifecycle phase, meaning they are available for maintenance and replacements but typically not recommended for new system designs. Verify project lifecycle requirements accordingly.
• Mounting Orientation Restrictions: Adhere to strict thermal limits: horizontal mounting allows up to +60 °C, whereas vertical mounting restricts the upper ambient temperature to +40 °C with reduced output loads.
• Shielding and Grounding: Communication lines must use proper shielding and grounding practices to comply with EMC guidelines (IEC 61000-4 series) and prevent data corruption over long serial runs.
• Terminal Block Handling: Delivered with TA532 9-pin spring/screw terminal blocks. Ensure proper torque or insertion force to avoid intermittent contact issues on serial lines.

Applications

• Water & Wastewater Management: Telemetry and remote terminal unit (RTU) linking via RCOM protocols for pump stations and reservoirs.
• Energy & Power Distribution: Connecting legacy sub-station automation devices, meters, and protection relays back to an AC500 automation controller.
• Oil, Gas & Infrastructure: Long-distance serial communication links connecting remote monitoring sites to central control PLCs.

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