Ezcom (Peer-To-Peer Communication) - Hitachi WJ200 Series Instruction Manual

B−20

EzCOM (Peer-to-Peer communication)

• Besides standard Modbus-RTU communication (slave), WJ200 supports
Peer-to-Peer communication between multiple inverters.
• The max. number of inverter in the network is up to 247 (32 without repeater).
• One administrator inverter is necessary in the network, and the other inverters
behave as master or slave.
• Be sure to set station No.1 as an administrator inverter, which controls master
inverter according to user setting. The others will be slave inverters. An admin.
inverter is fixed, but a master inverter always turns by rotation. For this reason, an
admin. inverter can be a master or a slave.
• A master inverter is able to write data to any holding register of designated slave
inverter. The max. number of holding register is up to 5. After writing data
completed, a master inverter will be shift to the next inverter.
• The max. number of master inverter is 8.
Admin. inverter
(1)
: Master inverter
Note 1: The command to change a master is issued by an admin. inverter automatically, which
users do not have to take care.
Inverter Inverter
(2)
Inverter
(3) (4)
Writing data to slaves by a
master (1).
Command to change
a master inverter. (Note 1)
Writing data to slaves by a
master (2).
Command to change
a master inverter.
Writing data to slaves by a
master (3).
Command to change
a master inverter.
Writing data to slaves by a
master (4).