Hitachi WJ Series User Manual page 360

Chapter 11
Configuring EzCOM communication
▼
1 Common settings for inverters that perform EzCOM communication
(1) Set RS-485 communication settings ([C071], [C074], [C075]) of the inverters to the same
setting.
(2) Set [C076] to [C078] by referring to the following timing diagram and notes.
2 Setting of administrator inverter (Node address 1)
(3) To perform EzCOM communication, install an inverter with "RS485 communication node
address [C072]" is set to (1) and "RS485 communication mode selection [C096]" is set to
"EzCOM Administrator (03)". This inverter becomes "Administrator inverter".
(4) Set the first and last node addresses of the inverters to operate as "master inverters" to
"EzCOM start node number [C098]" and "EzCOM end node number [C099]", respectively.
Also, set it so that it becomes [C098] ≦ [C099].
(In the time chart below, [C098] = 1 and [C099] = 4.)
(5) EzCOM communication start timing can be selected in "EzCOM start method selection
[C100]". When "Always communication (01)" is set, "Administrator inverter" starts EzCOM
communication at the same time as the power is turned on. When the power-on of other
inverters is delayed, communication time-out occurs in the "Administrator inverter", so the
start timing of other inverters should be set first so that it does not do so. When the
"[ECOM] terminal (00)" is set, EzCOM communication starts when the "EzCOM start [ECOM]
(81)" input terminal is turned ON.
3 Setting of master and slave inverters
(6) For the inverter to become "Master inverter", it is necessary to set a continuous node
address out of 1 to 8. Set the node address set from [C098] to [C099] of "Administrator
inverter" to "RS485 communication node address [C072]" of the inverters to be "Master
inverter" in order. The node address of the inverter that does not become the "Master
inverter" should be a node address other than the values set from [C098] to [C099] of
"Administrator inverter".
(7) Set "EzCOM (02)" in "RS485 communication mode selection [C096]" for all inverters
participating in EzCOM communication except "Administrator inverter".
(8) Set the data ([P140] to [P155]) to be written from the master inverter to the slave inverter to
each of "Master inverter".
■ Example of EzCOM communication timing diagram
・Configure EzCOM communication with four stations,
node addresses 1 to 4.
・Node addresses 1 to 3 become master inverter.
・Node address 4 is slave only and does not become master inverter.
Inverter 1
Send
Node
Receive
address 1
(Administrator)
Send
Inverter 2
Node
Receive
address 2
Send
Inverter 3
Node
Receive
address 3
Inverter 4 Send
Node
Receive
address 4
M
S
t1
t3 t2
M
S
tM2
t3
S S
S S
11-4-3
RS485 Communication
M Master data write
communication
Master switching command
Received data in write communication
S
slave
M
S
S S
t3 t3
M
S
S S
t1: Silent interval + "RS485 communication wait time [C078]"
t2: Silent interval + "RS485 communication wait time [C078]"
t3: "RS485 communication timeout [C077]"
Node Register Data
address
02 XXXX XXXX
02 XXXX XXXX
03 XXXX XXXX
03 XXXX XXXX
04 XXXX XXXX
Up to 5 data writes
can be specified.