4P642495-1A
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2022.02
Page
17
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52
Step by step explanation of the required copy of the BMS.
Below is an example for On/Off operation.
Note: The interval setting to the same register is over 0.5s.
[Legend]
[On/Off operation sequence example]
1. The BMS receives the Off status of units (1) and copies the input status to Holding registers (2).
2. The BMS sends an On command to the unit.
3. The BMS gets the status of the input register (1) and copies the received status to the holding registers (2).
Modbus
User
interface
Status
Setting status
BMS
Received status
Holding register
present value
Modbus Interface DIII
Input Register
Holding register The
last value
Status
Unit
DIII
(2) Off
(1) Off
User
interface
Off
Off
BMS
Off
Off
Modbus Interface DIII
Off
Off
Unit
Off
On
User
interface
On
On
BMS
-
On
Modbus Interface DIII
On
On
Unit
Off
On
The value of the holding register is changed. So the Modbus Interface DIII
sends the command to the units.
On
(2) On
(1) On
User
interface
On
On
BMS
On
On
Modbus Interface DIII
On
On
Unit
On
