Omron RX - 2, Руководство пользователя

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9 Communications Functions
High-function General-purpose Inverter RX2 Series User’s Manual
9-6 I
nter-
invert
er
Com
m
u
n
icat
ion
9
9-6 Inter-inverter Communication
In addition to the standard Modbus communication (slave), the 3G3RX2 Series Inverter provides the
co-inverter communication function, which enables more than one 3G3RX2 Series Inverter to commu-
nicate mutually without master equipment such as a computer or PLC.
In Inter-inverter Communication, the inverters are assigned as “management inverter,” “master
inverter,” and “slave inverter”. The master inverter is specified by the management inverter according to
the user settings. The others are slave inverters. The management inverter is always fixed, but the
master inverter is switched sequentially. Therefore, the management inverter may serve as the master
or a slave inverter. Other conditions are as follows.
• One management inverter is required within a network.
• Up to 11 inverters can serve as the master inverter.
• Up to 247 inverters can be connected within the entire network (32 inverters without repeaters in
compliance with the RS485 specifications).
In co-inverter communication, be sure to assign the station No. 1, which serves as the management
inverter.
The master inverter can write data to the holding registers on any slave inverter. At this time, up to five
different station numbers and holding registers can be specified at once. On completion of each data
transmission session between the master and a slave (or slaves), the master inverter is switched to the
next in a sequential manner. In this way, data transmission is repeated according to the settings for
each master inverter.
*1. Switching of the master is performed automatically by the management inverter.
Master (Inverter No. 1) sends
data to slave(s).
Management inverter
Station No. 1
Inverter
Station No. 2
Inverter
Station No. 3
Inverter
Station No. 4
: Master inverter
Master is switched from
Inverter 1 to Inverter 2.
*1*2
Master (Inverter No. 2) sends
data to slave(s).
Master is switched from
Inverter 2 to Inverter 3.
*3*4
Master (Inverter No. 3) sends
data to slave(s).
Master is switched from
Inverter 3 to Inverter 4.
Master (Inverter No. 4) sends
data to slave(s).