CM574-RS 1SAP170400R0001 ABB Bailey

Product Dimensions：

The CM574-RS is a communication module that slots directly onto the left side of an AC500 terminal base. It features two independent serial interfaces, typically labeled COM1 and COM2. This module acts as a hardware bridge, offloading serial communication tasks from the main CPU, which ensures that the primary control loop remains deterministic and unburdened. It is highly flexible, supporting software-configurable protocols such as Modbus RTU, CS31 (as master), or free graphical programming for user-specific ASCII protocols. The module is engineered for industrial environments, ensuring reliable data exchange over RS-232, RS-422, or RS-485 physical networks.

Product Parameters

• Product Type: Serial Communication Coupler Module

• Product ID: 1SAP170400R0001

• Model Designation: CM574-RS

• Number of Interfaces: 2 independent serial channels

• Physical Interface Types: Software selectable for RS-232, RS-422, or RS-485

• Supported Protocols: Modbus RTU (Master or Slave), CS31 Master, and ASCII / User-Defined protocols via standard PLC function blocks

• Baud Rates: Configurable up to $115.2 \text{ kbps}$ depending on the protocol and distance

• Connection Type: Usually terminated via a standard D-Sub 9-pin female connector or specific terminal strips on the base

• Current Consumption: Typically $0.15 \text{ A}$ from the internal $24 \text{ VDC}$ system bus

• Status Indicators: Integrated LED diagnostic displays on the front panel indicating Module Status (PWR, RUN), Error (ERR), and Transmit/Receive activity (Tx/Rx) for each port

• Environmental Standards: Operates within a standard temperature range of $0\text{°C}$ to $60\text{°C}$

Product Advantages

A major advantage of the CM574-RS is its Dual-Channel Independence. Having two fully separate ports allows a single module to interface with two entirely different types of networks simultaneously, such as an RS-485 Modbus network on one port and a localized RS-232 barcode reader on the other. The System Integration is seamless; because it belongs to the AC500 eco-system, it is fully configured within the Automation Builder software environment without needing third-party driver software.

The Protocol Versatility reduces hardware overhead by allowing the same module to be redeployed for different communication roles simply by changing the software logic. Additionally, the module's ability to offload serial string processing Optimizes CPU Performance, ensuring that high-speed motion or logic tasks executed by the main processor are never delayed by slow serial data transactions.

Important Considerations and Precautions

When deploying the CM574-RS, it is critical to observe proper Bus Termination practices. When configuring a port for RS-485 mode on a multi-drop network, ensuring that the first and last devices have a $120 \text{ \Omega}$ termination resistor engaged is essential to prevent signal reflection and data corruption. Electrostatic Discharge (ESD) protection must be used when handling or installing the module onto the terminal base to avoid damaging the delicate backplane pins.

The system power must be Completely Powered Off before clicking the module into place or removing it; hot-swapping this specific series can cause irreversible damage to the CPU bus. Additionally, users must respect the Maximum Cable Length Limits inherent to serial standards; for instance, RS-232 connections should not exceed $15 \text{ meters}$ ($50 \text{ feet}$), while RS-485 networks can extend much further but require high-quality shielded twisted-pair cabling to combat electromagnetic interference in high-voltage industrial zones.

Product Applications

The ABB CM574-RS is primarily used to connect the AC500 platform to specialized or older peripheral devices across automated facilities.

• Energy Monitoring: Interfacing with electrical power meters, trip units, and smart circuit breakers that utilize Modbus RTU protocols to send consumption data back to a central controller.

• Instrumentation Connectivity: Linking the PLC to analytical instruments, weight scales, or temperature controllers that output data via ASCII serial streams.

• Legacy Subsystem Integration: Bridging older machine control boards or third-party proprietary systems into a modern, Ethernet-capable AC500 PLC network architecture.

• Data Acquisition Accessories: Connecting peripheral input devices like barcode scanners, RFID readers, and serial printers on manufacturing or packaging lines.

• Remote Telemetry: Communicating with serial radio modems or telephone modems for SCADA systems located in remote water or oil and gas fields.

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