ABB CMA135

Description

Detailed Parameter Table

ABB CMA135

Product Introduction

The CMA135 is a compact communication adapter module from ABB, designed to enable seamless data exchange between AC500 PLC systems and field devices or higher-level control systems via Modbus RTU and Profibus DP protocols. As a critical interface in industrial networks, it bridges the gap between the PLC’s internal bus and external devices, facilitating real-time data transmission for monitoring and control in automation systems.

With dual-protocol support, CMA135 eliminates the need for multiple adapters in mixed-protocol environments, simplifying network architecture. Its rugged design and 2.5 kV isolation ensure reliable operation in electrically noisy industrial settings, making it suitable for applications in manufacturing, water treatment, and building automation. Whether connecting AC500 PLCs to Modbus-enabled sensors or integrating with Profibus-based SCADA systems, CMA135 delivers stable communication, enhancing the flexibility and interoperability of automation networks.

Core Advantages and Technical Highlights

Dual-protocol flexibility
CMA135 supports both Modbus RTU and Profibus DP, allowing AC500 PLCs to communicate with a wide range of devices without protocol conflicts. In a food packaging line, this versatility enables the PLC to:

Exchange data with Modbus RTU-based weighing scales via RS485

Connect to Profibus DP-enabled variable speed drives (e.g., ABB ACS580)
This integration reduces hardware costs and simplifies wiring, as a single module handles two critical communication paths.

High-speed data transfer
With Profibus DP speeds up to 12 Mbps and Modbus RTU up to 115.2 kbps, CMA135 ensures fast response times for time-critical applications. In a bottling plant’s conveyor synchronization system, the module transmits position data from Profibus encoders to the AC500 PLC in milliseconds, enabling precise speed adjustments to prevent bottle jams.

Robust isolation and noise immunity
The 2.5 kV AC isolation between signals and power protects against ground loops and electrical interference. In a steel mill’s rolling line, where high-voltage motors generate significant noise, CMA135 maintains stable communication between the PLC and temperature controllers, ensuring accurate process data transmission even during motor startup.

Typical Application Scenarios

In a municipal water treatment plant’s filtration system:

CMA135 connects the AC500 PLC to Modbus RTU-based flow meters and pressure sensors via RS485, monitoring filtration rates in real time.

It simultaneously communicates with a Profibus DP-enabled chemical dosing pump, adjusting reagent flow based on PLC calculations.

The module’s diagnostic LEDs provide immediate visual feedback if communication fails, allowing maintenance teams to quickly identify whether the issue is with Modbus or Profibus devices.

This setup ensures efficient water treatment by maintaining precise chemical dosing ratios, critical for regulatory compliance.

In a small manufacturing workshop’s machine control system:

CMA135 enables the AC500 PLC to collect data from Modbus RTU-based proximity switches (tracking part positions) and send commands to a Profibus DP-controlled robotic arm for assembly tasks.

Its compact size (35 mm width) fits into the control cabinet alongside other AC500 modules, saving space in the workshop’s limited electrical enclosure.

The module’s plug-and-play configuration via ABB’s Automation Builder software reduces setup time, allowing the system to be commissioned in hours rather than days.

ABB CMA135

Related Model Recommendations

CMA121: Modbus TCP/IP communication adapter for AC500 PLCs, complementing CMA135 in Ethernet-based networks.

PM554: AC500 PLC processor module that pairs with CMA135 for medium-complexity automation tasks.

CM578: Ethernet switch module that works with CMA135 to expand network connectivity for AC500 systems.

DI524: 16-channel digital input module for AC500, whose data is transmitted via CMA135 to SCADA systems.

ACS580: ABB variable speed drive with Profibus DP, compatible with CMA135 for motor control integration.

1SVR040720R0000: Terminal block for secure wiring of CMA135’s RS485 and Profibus connections.

Installation, Commissioning and Maintenance Instructions

Installation preparation
Mount CMA135 on a 35 mm DIN rail in the control cabinet, leaving 10 mm clearance on all sides for airflow. Connect the 24 V DC power supply (positive to +24 V, negative to 0 V) using 0.5-1.5 mm² wires. For Modbus RTU, wire the RS485 interface (A/B terminals) to the field device bus, ensuring twisted-pair cable with shield grounded at both ends. For Profibus DP, use a shielded D-sub 9-pin cable to connect to the Profibus network, terminating the bus with a 120 Ω resistor at the module if it is the last device in the chain.

Commissioning steps
Configure CMA135 using ABB Automation Builder software: select protocols (Modbus/Profibus), set baud rates, and map PLC data to communication registers. Test Modbus communication with a handheld tester to verify read/write functionality with field devices. For Profibus, use a network analyzer to check for signal integrity and proper addressing. Confirm that status LEDs illuminate correctly (green for power, flashing green for active communication).

Maintenance suggestions
Inspect CMA135 quarterly for loose connections or damaged cables. Clean the module’s connectors with compressed air to remove dust. Monitor communication status LEDs during operation—red LEDs indicate faults requiring attention (e.g., bus errors). If communication fails, check for incorrect baud rates or address conflicts before replacing the module. Replace CMA135 with an ABB-approved spare if internal components fail, ensuring the new unit is reconfigured with identical protocol settings.

Service and Guarantee Commitment

CMA135 is backed by a 2-year warranty, covering defects in materials and workmanship under normal operating conditions. ABB’s automation technical support team provides guidance on protocol configuration, network troubleshooting, and integration with AC500 PLC systems.

Customers receive access to detailed user manuals and configuration guides for CMA135, including wiring diagrams and software setup tutorials. ABB offers replacement modules through global distribution centers, ensuring minimal downtime for critical communication links. With expert support available via phone or email, users can quickly resolve issues related to Modbus/Profibus integration, maximizing the reliability of their automation networks.