5.4 FRENIC-VG Loader
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Chap. 5 USING STANDARD RS-485
5.4.2.2 RS-485 connection
The FRENIC-VG or FRENIC5000VG7 has an RS-485 communications interface as standard,
enabling access from FRENIC-VG Loader in RS-485 communication.
Connecting the inverter to a computer requires an RS-485 converter. In the maximum configuration,
up to 31 inverters can be connected to a single computer running FRENIC-VG Loader. When two or
more inverters are connected, it is necessary to register each inverter (station address, etc.) for access
from FRENIC-VG Loader.
Connection with FRENIC-VG
The FRENIC-VG has an RS-485 terminal on the control terminal block. Connect the
communications cable to that terminal.
For details on connection, refer to Section 5.1.3 "Connection method."
For details on RS-485 converters, refer to Section 5.1.4 "RS-485 Communications support
devices."
Connection with FRENIC5000VG7
Use the VG7 loader cable for connection.
For details, refer to the FRENIC5000VG7 related documents.
5.4.2.3 Communication via MICREX-SX
In the system configuration in which the FRENIC-VG or FRENIC5000VG7 inverters are connected
with the MICREX-SX via the SX bus (or E-SX bus), FRENIC-VG Loader can access to those
inverters through the MICREX-SX. (Transparent communication)
Figure 5.4.2-2 Access to Inverters in Transparent Communication
In transparent communication, the MICREX-SX runs software in the preset task cycle in RUN mode.
FRENIC-VG Loader uses unoccupied time in the task cycle to access the inverter without interrupt;
therefore, it does not disturb the operation of the machinery.
Reading or writing data from/to the inverter sometimes takes time.
MICREX-SX
SX bus (or E-SX bus)
Computer
(FRENIC-VG Loader)
OPC-VG1-SX
OPC-VG1-SX
OPC-VG1-SX
Access to FRENIC-VG through the
MICREX-SX
FRENIC-VG
Connection with
MICREX-SX via
・USB
・RS-485
・Ethernet
Register SX station
address and access to the
FRENIC-VG
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