ABB FMBA-01 Руководство пользователя - Страница 9
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RS-485 bus cable should be terminated with a 120 ohm resistor
on both ends to prevent signal reflection. When no device on the
network is transmitting, noise can be falsely interpreted as
communication data. To avoid this, termination can be included
with a fail-safe circuit (pull-up and pull-down resistors). The circuit
forces the bus into a known idle state when no device is
transmitting.
The FMBA-01 Modbus Adapter module
The FMBA-01 Modbus Adapter module is an optional device for
ABB drives which enables the connection of the drive to a RS-485
network. The FMBA-01 provides galvanic isolation between the
drive and RS-485 network and converts serial communication
signals of the drive to RS-485 signal levels.
The FMBA-01 has a built-in bus termination with fail-safe circuitry.
The termination can be activated with a jumper.
The adapter module is mounted into an option slot on the motor
control board of the drive. See the drive documentation for module
placement options.
Other
RS-485
device
Overview
Construction of the RS-485 network and the FMBA-01
ABB drive
Diagnostic LEDs
(See chapter
Termination jumper J1
(See chapter
Bus connector X1
(see chapter
Other
RS-485
device
LED
indications)
Electrical
installation)
Electrical
installation)