ABB FMBA-01 - RS-485 link; LED indications

Technical data and diagnostics
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General:
• Estimated min. lifetime: 100 000 h
• All materials UL/CSA-approved
• Complies with EMC standards EN 50081-2 and EN 50082-2
• Bus interface functionally isolated from drive
RS-485 link
Compatible devices: All RS-485 compliant devices
Medium: Shielded twisted pair cable, impedance 100 to 150 ohm
• Termination: 120 ohms (built in the FMBA-01 Modbus Adapter
module)
Topology: Trunk line, drop lines allowed
Transfer rate: 5 Mb/s max.
Serial communication type: Asynchronous, half-duplex RS-485
Protocol: Depends on the used application. Typically Modbus.
LED indications
The FMBA-01 Modbus Adapter module is equipped with three
green diagnostic LEDs. The LEDs are described below.
Name Colour Function
HOST Green The module is powered up.
RXD Blinking
The module receives data from the
bus. The LED blinks whether the
received data is address to the unit
or not.
TXD Blinking
The module sends data to the bus.