Ezcom (Peer-To-Peer Communication) - Omron MX2 User Manual

Network Protocol Reference
B-3-6

EzCOM (Peer-to-Peer communication)

Admin. inverter
(1)
: Master inverter
Note 1
Note 2
Note 3
278
• Besides standard Modbus-RTU communication (slave), MX2 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 invert-
ers. An admin. inverter is fixed, but a master inverter always turns by rota-
tion. 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 desig-
nated 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.
Inverter
(2)
The command to change a master is issued by an admin. inverter automati-
cally, which users do not have to take care.
The command to change a master from 01 to 02 is issued after the data is
sent from master inverter 01 to slave and silent interval plus communication
wait time (C078) passed.
Administrative inverter issues the next command to change a master after the
data from master inverters is sent and silent interval plus communication wait
time (C078) passed. In case the data from master inverter cannot be received
within the communication timeout (C077), then the inverter timeouts and the
behaves according to the communication error selection.
Inverter Inverter
(3) (4)
Section B-3
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).