ABB CM574-RS 1SAP170400R0201 Communication module

Brand: ABB

Product Series: AC500 PLC Automation Platform

Model: CM574-RS (Part Number: 1SAP170400R0201)

Product Type: Dual-Channel Serial Communication Module (2x RS-232 / RS-485 Configurable)

ABB CM574-RS 1SAP170400R0201 Communication module

Technical Parameters:

System Compatibility: Integrated communication module designed for direct slot insertion into ABB AC500 PLC Terminal Bases (TB5xx-S) alongside PM5xx CPUs.

Interfaces & Channels: 2x freely configurable serial interfaces (Com1 and Com2), supporting independently selectable RS-232 or RS-485 operational modes.

Supported Communication Protocols: Modbus RTU (Master/Slave), ASCII protocol, CS31 system bus protocol, and freely programmable serial ASCII/binary communication modes.

Baud Rate & Speed: Adjustable serial transmission speed supporting standard baud rates up to 115.2 kbit/s for fast data exchange with serial devices.

Galvanic Isolation: Built-in electrical and optical isolation per channel to protect the CPU core logic from field-side electrical surges and voltage spikes.

Diagnostic Telemetry: Integrated front-panel LED status indicators providing real-time visual feedback for power supply health, transmit/receive activity (Tx/Rx), and communication error states.

Operating Power Supply: Sourced directly via the AC500 CPU terminal base backplane with minimal power consumption.

Physical Dimensions & Weight: Compact form factor measuring approximately 135 mm (H) x 28 mm (W) x 62 mm (D) with a net weight of approximately 0.095 kg.

Industrial Sectors:

Factory Automation & Machine Building (OEM), Water and Wastewater Infrastructure, Building Automation & HVAC Systems, Food and Beverage Processing, Packaging and Material Handling, and General Industrial Control.

Application Scenarios:

1. Multi-Device Serial Fieldbus Gateway: Installed on AC500 PLC terminal bases to interface with third-party serial instruments—such as bar code scanners, RFID readers, weighing scales, and digital power meters—via ASCII or Modbus RTU protocols.

2. Variable Frequency Drive (VFD) Control Links: Deployed in automated processing panels to control and monitor multiple motor drives and soft starters over RS-485 serial loops without using up central CPU ports.

3. HMI & Legacy SCADA Telemetry Interfacing: Positioned in remote control panels to maintain serial data connections with local touch panels (HMIs) or older SCADA networks while integrating with modern Ethernet-capable controllers.

4. Distributed Control System (DCS) & PLC System Expansion: Utilized during plant automation upgrades to add two extra isolated serial communications ports to standard AC500 control systems without changing the primary processor architecture.