This manual describes the installation and operation of the ABB Modbus Adapter Module RMBA-01.
This manual covers safety guidelines, installation steps, wiring diagrams and terminal designations for the RMBA-01 Modbus Adapter Module used with ABB ACS 800 drives. It also explains how to configure the Modbus connection, program the master station, and interpret communication registers.
The document includes a fault‑tracing chapter with LED diagnostics and an appendix with technical data such as power consumption, protection rating, bus length, and supported Modbus parameters.
| Degree of protection | IP20 |
|---|---|
| Maximum power consumption | 140 mA (5 V) |
| Estimated minimum lifetime | 100 000 h |
| Maximum bus length | 1200 m |
| Supported transfer rates | 600 – 19200 bit/s |
| Protocol | Modbus RTU |
| Number of stations supported | 247 stations |
| Connector type | 38‑pin parallel bus connector |
Two green LEDs show transmit and receive activity, while a yellow LED indicates module status and power‑up condition.
The RMBA-01 can address up to 247 stations, including repeaters.
The module consumes a maximum of 140 mA at 5 V, supplied by the RMIO board.
The enclosure is rated IP20.