8-8
Co-inverter Communication
In addition to the standard Modbus communication (slave), the 3G3M1 Series Inverter provides the
co-inverter communication function, which enables more than one 3G3M1 Series Inverter to communi-
cate mutually without master equipment such as a computer or PLC.
In co-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 in-
verter 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 eight 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 RS-485 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.
Management inverter
Station No. 1
Inverter
Station No. 2
Inverter
Station No. 3
Inverter
Station No. 4
Master (Inverter No. 1) sends data to slave(s).
Master (Inverter No. 2) sends data to slave(s).
Master (Inverter No. 3) sends data to slave(s).
Master (Inverter No. 4) sends data to slave(s).
Master is switched from Inverter 1 to Inverter 2.
*1*2
Master is switched from Inverter 2 to Inverter 3.
*3*4
Master is switched from Inverter 3 to Inverter 4.
Master inverter
*1. Switching of the master inverter is performed automatically by the management inverter.
*2. The management inverter sends the master switching command from Inverter No. 01 to 02 after data is sent
from Inverter 01 (master) to a slave (or slaves), with a wait time of “silent interval + Communication Wait Time
(y19).”
8 Communications Functions
8-27
M1 Series Standard Type User's Manual (I669)
8-8 Co-inverter Communication
8
8-8-1 Co-inverter Communication Parameters
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