5.1 Standard RS-485 Communications Ports
5-1
Chap. 5 USING STANDARD RS-485
5.1 Standard RS-485 Communications Ports
The FRENIC-VG has standard 1-channel RS-485 communications ports. The RS-485
communications ports are assigned in the control terminal block, enabling easy multi-drop
connection.
RS-485 enables the following communications functions.
(1) Communication through Modbus RTU / Fuji general-purpose inverter protocol
The FRENIC-VG can be connected to a host (master) device such as a PC, PLC, or
display/operation device. Through the interface, you can execute run/stop commands, monitor the
running status, and change the function code data.
(2) Connection to FRENIC-VG Loader
FRENIC-VG Loader can be installed on a PC to enable connection between FRENIC-VG and
RS-485. Through the interface, you can use the various functions of FRENIC-VG Loader such as
editing the function code data, tracing the running data in real time, and tracing back the running
data from the time when an alarm occurs. Multi-drop connection through RS-485 enables you to
access up to 31 FRENIC-VG inverters with one FRENIC-VG Loader.
FRENIC-VG Loader can also be connected to the built-in USB port of the FRENIC-VG. However,
in this case it would be a one-to-one connection.
• The RJ-45 connector for the keypad is intended solely for communication using the
keypad, and cannot be used for RS-485 communication.
• Do not connect the inverter to a PC LAN port, Ethernet hub, or telephone line. Doing so
may result in damage to the inverter or connected device.
The application can be used when a run command is executed and a break in communication is
detected or an alarm occurs. If a communication error occurs during operation, it is possible to issue
an
er5
alarm (RS-485 alarm) after the application starts up. At this time, the inverter output cuts
off and the motor idles.
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