RMBA-01 User
’
s manual
2-1
Chapter 2
–
Overview
Overview
This chapter contains a short description of the Modbus
protocol and the RMBA-01 Modbus Adapter module, a
delivery checklist, and warranty information.
Introduction to
Modbus
Modbus is a serial, asynchronous protocol. The
Modbus protocol does not specify the physical
interface. Typical physical interfaces are RS-232 and
RS-485. The RMBA-01 provides a galvanically-isolated
RS-485 interface.
Modbus is designed for integration with Modicon PLCs
or other automation devices, and the services closely
correspond to the PLC architecture. The RMBA-01
supports the RTU protocol only.
The RMBA-01
Modbus Adapter
module
The RMBA-01 Modbus Adapter module is an optional
device for ABB drives which enables the connection of
the drive to a Modbus system. The drive is considered
as a slave on the Modbus network. Through the
RMBA-01 Modbus Adapter module it is possible to:
• Give control commands to the drive
(Start, Stop, Run enable, etc.)
• Feed a motor speed or torque reference to the drive
• Give a process actual value or a process reference to
the PID controller of the drive
• Read status information and actual values from the
drive
• Change drive parameter values
• Reset a drive fault
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