Product Introduction

Model Explanation

• 1SAP170400R0001: Full ABB part number.

• CM574-RS: Communication Module, RS-series serial interface.

• 170400: CM574 base platform; R0001: hardware revision.

• RS: Indicates dual RS232/RS485 ports, distinguishing it from CM572 (PROFIBUS DP) and CM570 (Ethernet) modules in the AC500 lineup.

Technical Parameters

• Power Supply: 24 V DC (±20%), powered via PLC backplane bus.

• Power Consumption: Max 2.0 W.

• Serial Interfaces: 2 × independent channels, software-configurable as RS232 or RS485.

• Baud Rate: 9.6 Kbps to 187.5 Kbps (configurable).

• Protocols: Modbus RTU, ASCII, and custom serial protocols (via Automation Builder).

• Isolation: 500 V DC electrical isolation between serial ports and PLC bus.

• Operating Temperature: -25 °C to +60 °C; storage: -40 °C to +85 °C.

• Protection Class: IP20; certifications: CE, cULus, RoHS.

• Dimensions: 135 × 28 × 62 mm (H × W × D); weight: ~0.095 kg.

• Connector: 9-pin male MC 0.5/9-G-2.5 for serial ports.

• LED Indicators: PWR, TXD, RXD for power and communication status.

Interface & Communication Configuration

• Dual Serial Ports: Two independent channels, each selectable for RS232 (point-to-point) or RS485 (multi-drop network).

• PLC Bus Connection: Directly interfaces with AC500 CPU’s FBP bus for high-speed internal communication.

• Isolation Design: 500 V DC isolation protects PLC circuitry from serial-side electrical noise and voltage spikes.

• Software Configuration: Set baud rate, data bits, stop bits, parity, and protocol via ABB Automation Builder.

• Diagnostics: LED status indicators and system diagnostics enable quick troubleshooting of serial communication issues.

Core Functions

• Dual-Channel Serial Communication: Simultaneously manage two serial devices or networks with independent protocol and parameter settings.

• Protocol Flexibility: Supports Modbus RTU (master/slave), ASCII, and user-defined protocols for seamless integration with third-party equipment.

• Legacy Device Connectivity: Bridges modern AC500 PLCs to older serial-based sensors, drives, and controllers.

• Hot-Swap Support: Can be replaced without powering down the AC500 system, minimizing downtime.

• High Noise Immunity: Electrical isolation and robust hardware design ensure stable operation in harsh industrial environments.

Application Scenarios

• Factory automation: Connecting PLCs to variable frequency drives, servo motors, and intelligent sensors via RS485.

• Building automation: Integrating HVAC controllers, energy meters, and access control systems using RS232/RS485.

• Process industries: Water treatment, chemical, and pharmaceutical plants requiring serial communication with analytical instruments and meters.

• Legacy system migration: Upgrading old serial-based control systems to AC500 PLCs without replacing existing field devices.

• Industrial networking: Combining with Ethernet modules (CM570) to build hybrid networks integrating serial and Ethernet devices.

Usage & Maintenance Instructions

• Mount on TH35-15 DIN rail adjacent to AC500 CPU; connect to FBP bus via internal backplane connector.

• Wire serial devices to 9-pin connectors: RS232 uses TX/RX/GND; RS485 uses A/B lines with 120 Ω termination at bus ends.

• Configure communication parameters and protocols in Automation Builder before operation.

• Keep the environment clean, dry, and well-ventilated; inspect connectors and wiring quarterly for wear or loose connections.

• No user-serviceable parts inside; replace the module if LEDs show persistent faults or communication failures occur.