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Product Introduction
The ABB FMBT-21 is an advanced Modbus/TCP communication adapter module, designed to enable Ethernet-based industrial connectivity for ABB’s low voltage AC drives. This module allows ABB drives to seamlessly communicate over Modbus/TCP networks, making it an essential component for modern automation systems requiring reliable Ethernet-based fieldbus communication.
Engineered to plug directly into the drive’s fieldbus port, the FMBT-21 adapter provides efficient and deterministic control and monitoring capabilities in real time. It is fully compatible with Modbus/TCP protocol standards and integrates ABB drives into Ethernet-based architectures including SCADA, PLC, and DCS systems. The unit also supports easy commissioning and diagnostics with built-in web tools and LED status indicators.
Product Specifications
| Parameter | Details | 
|---|---|
| Product Name | ABB FMBT-21 Modbus/TCP Adapter Module | 
| Part Number | 3AXD50000192717 | 
| Communication Protocol | Modbus/TCP (Ethernet-based) | 
| Supported Network Types | 10/100 Mbps Ethernet (IEEE 802.3 compliant) | 
| Connector Type | RJ-45 (x2, internal switch for daisy-chaining) | 
| Drive Compatibility | ABB ACS355, ACS580, ACS880, and other ACS Series | 
| Max Devices per Network | 247 devices (standard Modbus limit) | 
| Status Indicators | Integrated dual-color LEDs for link, activity, error | 
| Configuration Tools | Built-in web server (via browser), Drive composer | 
| IP Address Assignment | DHCP / Static IP support | 
| Operating Temperature | -10°C to +60°C | 
| Storage Temperature | -40°C to +70°C | 
| Humidity | 5% to 95% non-condensing | 
| Certifications | CE, RoHS, UL, cUL | 
| Dimensions (H x W x D) | 405 × 140 × 450 mm | 
| Weight | 4.1 kg | 
| Enclosure Rating | IP20 (when installed in drive) | 
Applications
The FMBT-21 Modbus/TCP Adapter is engineered for a wide range of industrial applications where Ethernet-based communication is required for drive integration. These include:
- 
Building Automation Systems
Integrates HVAC systems and energy management components into central controllers using Modbus/TCP. - 
Process Industry Automation
Ensures stable communication between ABB drives and SCADA/DCS systems for oil & gas, chemical, and pharmaceutical sectors. - 
Water and Wastewater Treatment
Provides Ethernet connectivity for pump and blower control applications across treatment plants. - 
Material Handling and Conveyors
Enables seamless operation and status reporting of motors in automated warehouse and logistics systems. - 
Food and Beverage Production Lines
Allows precise speed control and real-time feedback for mixers, conveyors, and packagers. - 
Power Plants and Renewable Energy
Offers reliable and scalable Ethernet interfacing for motor-driven subsystems in turbines, solar farms, or biomass stations. 
Key Advantages
- 
Ethernet Modbus/TCP Connectivity
Provides standardized, high-speed communication over widely used Ethernet networks. - 
Built-in Web Configuration
Easily configure and diagnose the adapter using any standard web browser—no additional software needed. - 
Dual Ethernet Ports
Integrated Ethernet switch allows for daisy-chaining of multiple devices without needing an external switch. - 
Drive Compatibility
Fully plug-and-play with most ABB ACS drives, eliminating the need for additional mounting hardware. - 
High Data Throughput
10/100 Mbps support ensures rapid data transfer, ideal for real-time automation applications. - 
Diagnostic LEDs
Immediate visual feedback for link status, activity, and fault detection ensures fast troubleshooting. - 
Compact Form Factor
Space-efficient design fits within ABB drive enclosures while maintaining proper airflow. - 
Future-Proof Networking
Enables migration from serial to Ethernet infrastructure, aligning with Industry 4.0 initiatives. 
Frequently Asked Questions (FAQ)
- 
Q: Which ABB drives are compatible with the FMBT-21 adapter?
A: It supports various models including ACS355, ACS580, ACS880, and other ACS series drives. - 
Q: Does the FMBT-21 support DHCP for dynamic IP assignment?
A: Yes, it supports both DHCP and static IP configuration. - 
Q: Can I connect multiple devices using the built-in ports?
A: Yes, the adapter includes two Ethernet ports with an internal switch for daisy-chaining. - 
Q: Is additional software required for setup?
A: No, configuration can be done via a web browser through the built-in web interface. - 
Q: Does this adapter support redundant networking?
A: No, it supports basic Ethernet networking without redundancy protocols like RSTP. - 
Q: How do I know the communication status?
A: Status LEDs provide clear indicators for link status, communication activity, and error states. - 
Q: Is the adapter powered externally?
A: No, the FMBT-21 is powered directly from the drive it’s connected to. - 
Q: Can it be used in high-humidity environments?
A: It operates in 5% to 95% non-condensing humidity conditions and should be installed in a control cabinet. - 
Q: What is the default IP address of the adapter?
A: If not using DHCP, the default static IP can be set via the drive or web interface. - 
Q: What’s the maximum length of Ethernet cable I can use?
A: Standard Cat5e or Cat6 Ethernet cables can be used up to 100 meters per segment. 
Related Models (Same Series or Application)
| Model | Description | Protocol | Drive Compatibility | 
|---|---|---|---|
| FENA-01 | Ethernet Adapter Module | EtherNet/IP | ACS355, ACS550 | 
| FENA-11 | Dual-Port Ethernet Adapter Module | Modbus TCP / EtherNet/IP | ACS580, ACS880 | 
| FMBT-01 | Modbus/TCP Adapter (Previous Generation) | Modbus/TCP | Legacy ABB Drives | 
| FBPA-01 | Profibus DP Communication Adapter | Profibus DP | ACS Series | 
| FCAN-01 | CANopen Fieldbus Adapter | CANopen | ACS355, ACS850 | 
| FECA-01 | EtherCAT Communication Adapter | EtherCAT | ACS880 Series | 
Popular ABB Automation Modules
| Model | Description | Application | Communication | 
|---|---|---|---|
| PM564-ETH | Compact AC500-eCo PLC with Ethernet | General Automation Controller | Ethernet | 
| CI862-PN | PROFINET Interface Module | 800xA System Communication | PROFINET | 
| AI820 | Analog Input Module (4–20mA, 8 channels) | ABB S800 I/O | Analog Input | 
| DO820 | Digital Output Module (16 channels) | ABB S800 I/O | Digital Output | 
| CP600-Eco | Entry-Level HMI Panel 7″ Touch | Operator Interface | Ethernet/Serial | 
| TU830V1 | Extended MTU with 16 Channels | Modular I/O Termination | Module Backplane | 
Excellent PLC
