Product Introduction

Model Explanation

• 1SAP170401R0001: Full ABB part number.

• CM574‑RCOM: Communication Module, RCOM‑protocol serial interface.

• 170401: CM574 base platform with RCOM firmware; R0001: hardware revision.

• RCOM: Indicates native support for ABB RCOM protocol (vs. CM574‑RS for general Modbus/ASCII).

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 (point‑to‑point) or RS485 (multi‑drop).

• Baud Rate: 9.6 Kbps to 187.5 Kbps (RCOM default: 19.2 Kbps / 38.4 Kbps).

• Protocols: RCOM (native), Modbus RTU, ASCII, and custom serial protocols.

• Isolation: 500 V DC between serial ports and PLC internal 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 for each serial channel.

• LED Indicators: PWR, TXD, RXD, and RCOM status for diagnostics.

Interface & Communication Configuration

• Dual Serial Ports: Two isolated channels, each switchable between RS232 and RS485.

• RCOM Master/Slave: Native RCOM protocol support for seamless communication with ABB drives (e.g., ACS series) and RCOM‑enabled peripherals.

• PLC Bus Connection: Direct interface with AC500 CPU’s FBP bus for high‑speed internal data exchange.

• Isolation Design: 500 V DC isolation suppresses electrical noise and voltage spikes in harsh environments.

• Software Configuration: Assign RCOM addresses, set baud rates, and map I/O via ABB Automation Builder; import RCOM device files for easy integration.

• Diagnostics: LED status and system diagnostics enable fast troubleshooting of RCOM/serial links.

Core Functions

• Native RCOM Communication: Optimized for ABB RCOM protocol, ensuring deterministic, high‑efficiency data exchange with ABB drives and RCOM devices.

• Dual‑Channel Serial Connectivity: Simultaneously manage RCOM and third‑party serial devices (Modbus RTU/ASCII) on separate channels.

• Legacy & Proprietary Integration: Bridge AC500 PLCs to both older serial equipment and ABB‑specific RCOM devices.

• Hot‑Swap Support: Replace module without powering down the AC500 system, minimizing downtime.

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

Application Scenarios

• ABB drive integration: Connecting AC500 PLCs to ABB ACS series drives via RCOM for motion control.

• Factory automation: ABB‑centric lines (automotive, packaging) requiring RCOM and serial device coexistence.

• Process industries: Water treatment, chemical, and pharmaceutical plants with ABB RCOM‑enabled instruments.

• Legacy system migration: Upgrading to AC500 while retaining existing RS485/RS232 sensors and meters.

• Hybrid networks: Combining with Ethernet modules (CM570) for integrated RCOM/serial/Ethernet systems.

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 RCOM addresses, baud rates, and I/O mapping in Automation Builder before operation.

• Keep environment clean, dry, and ventilated; inspect connectors/wiring quarterly for wear or looseness.

• No user‑serviceable parts inside; replace module if LEDs show persistent faults or RCOM/serial failures occur.