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        RMBA-01
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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power provides verified, surplus ABB RMBA-01 replacement modules, supplying automated manufacturing plants with a reliable source for obsolete drive hardware to preserve legacy equipment lifespans. 

        RMBA-01

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        The ABB RMBA-01 is a Modbus RTU adapter module for ACS800 drives, enabling fully isolated RS‑485 communication and integration with Modbus master devices.
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        Ships by Thursday, October 29
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for RMBA-01

        • Manufacturer:
          ABB
        • Part Number:
          RMBA-01
        • Product Family:
          ABB Drives
        • Product Type:
          Adapter Module
        • Stock:
          9
        • Max. power consumption:
          140 mA (5 V), supplied bythe RMIO board
        • Estimated min. lifetime:
          100 000 h
        • Approved:
          All materials UL/CSA-approved
        • Standards:
          Complies with EMC Standards EN 50081-2 and EN50082-2
        • Mounting:
          Into an option slot of the RMIO board of the drive or onto external I/O Module Adapter (AIMA-01).
        • Degree of protection:
          IP20
        • Connectors:
          38-pin parallel bus connector; One 4-pole terminal block for connection of thefieldbus cable, detachable (max 1.5 mm2)
        • Hardware settings:
          One DIP switch for bus termination selection
        • Compatible devices:
          Any Modbus device capable of Modbus communication as a master
        • Size of the link:
          247 stations including repeaters (31 stations and 1 repeater per segment)
        • Medium:
          Shielded, twisted pair RS485 cable
        • Termination:
          built in, active type
        • Modbus cable:
          Belden 9841 (2-wire),Belden 9842 (4-wire), or equivalent
        • Maximum Bus Length:
          1200 m
        • Topology:
          Multi-drop
        • Serial communication type:
          Asynchronous, half
        • Transfer rate:
          600, 1200, 2400, 4800, 9600,19200 bit/s
        • Protocol:
          Modbus RTU
        • Weight:
          0.06 kg
        • Estimated shipping dimensions:
          9.3x6.1x3.5cm
        • Tariff Code:
          8537101190
        • Country of origin:
          Sweden
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Applications Monitoring & Control Safety & Compliance

        Features:

        • Onboard Active Bus Termination Control
        • Galvanically-Isolated RS-485 Physical Interface
        • Pre-Defined Modbus Register Mapping Architecture
        The ABB RMBA-01 is equipped with a built-in, active-type termination network that successfully dampens signal reflections across long network runs. Managed via an onboard S1 DIP switch, it eliminates the need for manual, external resistor wiring at network endpoints, provided the module remains powered by the drive to keep the active circuitry operational.

        To withstand aggressive industrial environments, the ABB RMBA-01 implements comprehensive galvanic isolation between the Modbus fieldbus link and the drive control circuitry. This robust electrical barrier stops harmful ground loop currents and transient voltage spikes from damaging the internal RMIO control board, maintaining network integrity.

        The ABB RMBA-01 structures all transmission data sets and internal drive parameters into standard Modbus 4xxxx holding registers. This pre-defined framework natively translates drive parameters into a direct 4GGPP format (where GG represents the group and PP represents the parameter), significantly shortening the time required for PLC or SCADA programming.

        The RMBA-01 ABB Modbus Adapter Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        ABB RMBA-01 Modbus Adapter Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        ABB RMBA-01 Modbus Adapter Module

        General

        • Manufacturer ABB
        • Model RMBA-01
        • Condition New Original ready stock
        • Product Family RMU102,RMIO-01C,NDBU-85C
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Centralized Pumping Systems: Enables remote monitoring and continuous speed control over distributed pump arrays in water and wastewater infrastructure via Modbus lines.
        • HVAC Air Handling Networks: Integrated into large commercial air handling systems to deliver real-time fan speed control, air volume adjustments, and energy consumption reporting.
        • Conveyor & Logistics Automation: Deployed in mining operations and assembly facilities to coordinate multidrive line speeds and transmit instant fault alarms to a central PLC.
        • Chemical Batch Processing: Facilitates precise torque and mixing velocity adjustments while feeding drive telemetry to SCADA historian systems for regulatory data logging.
        • Full Drive Telemetry Mapping: Allows master systems to read process actual values, historical error logs, motor current, and operating temperatures from the drive.
        • Remote Command Execution: Provides authorization to execute remote start, stop, direction reversal, and fault reset sequences directly over the network bus.
        • Dynamic Parameter Optimization: Supports changing drive acceleration curves, current thresholds, and torque limits on the fly to meet changing operational demands.
        • Cyclic Data Word Streaming: Uses high-speed, 3-word data set architectures (Registers 40001–40096) to stream time-critical control parameters with minimal latency.
        • Industrial Noise Shielding: Designed to meet EN 50081-2 and EN 50082-2 emission and immunity directives, protecting data transmissions from severe high-voltage spikes.
        • Isolation Barrier Integrity: Galvanic isolation blocks high-voltage ground loops, protecting internal low-voltage drive processors and network fieldbus wiring.
        • Component-Level Safety Approvals: Built using UL and CSA approved components, ensuring compliance with strict industrial fire safety and structural standards.
        • Secure Failsafe Configuration: Communicates invalid memory requests via standardized Modbus exception codes (01, 02, 03) to prevent the host system from executing unsafe control states.
        Description
        The RMBA-01 Modbus Adapter Module allows ACS800 drives to operate as Modbus slaves. It supports asynchronous half-duplex serial communication with data transfer rates from 600 to 19200 bit/s. The module is compatible with all standard Modbus master devices and can handle up to 247 stations including repeaters, using shielded twisted-pair RS‑485 cabling.

        Mechanically, the RMBA-01 mounted into the RMIO board option slot or onto an external I/O Module Adapter (AIMA‑01). It features a 38-pin parallel bus connector and a detachable 4-pole terminal block for fieldbus cable connections (up to 1.5 mm²). A DIP switch allows bus termination configuration. The module meets IP20 protection standards and complies with EMC standards EN 50081-2 and EN 50082-2.

        The RMBA-01 is UL/CSA approved and all materials used are certified. Maximum power consumption is 140 mA at 5 V supplied by the RMIO board. Estimated minimum lifetime is 100,000 hours. Termination is built-in and active-type, compatible with Belden 9841/9842 or equivalent Modbus cabling.
        Alternative Names
        RM8A-01 RMBA-O1 RMBA-0I RMBA01 RMU102 TRM01 RMIO-01C
        Technical notes
        The ABB RMBA-01 Modbus Adapter Module acts as a Modbus RTU serial slave that maps drive parameter groups directly to the 4GGPP register format within the 4xxxx memory area. To prevent signal reflections across the half-duplex RS-485 line, the ABB RMBA-01 utilizes a built-in active bus termination network configurable via an onboard S1 DIP switch.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        What communication protocol does the RMBA-01 support?
        The RMBA-01 supports Modbus RTU over RS‑485.
        How is the RMBA-01 mounted?
        It can be mounted in the RMIO board option slot or on an AIMA‑01 I/O Module Adapter.
        What communication protocol and data speed limits does the ABB RMBA-01 support for host network interfacing?
        The ABB RMBA-01 supports the standard Modbus RTU protocol exclusively operating in asynchronous, half-duplex serial networks. It allows communication rates to be selected via the drive panel interface, supporting standardized transmission baud rates of 600, 1200, 2400, 4800, 9600, and up to 19200 bit/s depending on the overall network distance and infrastructure limits.
        How does the ABB RMBA-01 map parameters, and what format do the registers use during PLC polling?
        The ABB RMBA-01 translates all internal drive parameters into the standard 4xxxx holding register area. Data sets occupy registers 40001 to 40096 for rapid cyclic updates, while standard parameters are mapped in a 4GGPP structure from 40101 to 49999, where "GG" defines the native ABB drive parameter group and "PP" represents the specific parameter index.
        How are the I/O pins on the detachable X1 terminal block of the ABB RMBA-01 designated for network wiring?
        The detachable X1 terminal block on the ABB RMBA-01 provides four dedicated termination points for precise bus layout. Terminal 1 is designated for Data Negative (A), Terminal 2 for Data Positive (B), Terminal 3 serves as the Data Ground (DG) common reference, and Terminal 4 provides an AC earthing connection for the Modbus cable shield through an internal RC circuit.

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