Individual Functions
6-71
Message Format
In MEMOBUS communications, the master sends commands to the slave, and the slave responds. The mes-
sage format is configured for both sending and receiving as shown below, and the length of data packets
depends on the command (function) content.
The space between messages must meet the following conditions:
Fig 6.45 Message Spacing
Slave Address
Set the Inverter address from 0 to 32. If you set 0, commands from the master will be received by all slaves.
(Refer to “Broadcast Data” on the following pages.)
Function Code
The function code specifies commands. The three function codes shown in the table below are available.
Data
Configure consecutive data by combining the memory register address (test code for a loopback address) and
the data the register contains. The data length changes depending on the command details.
Slave address
Function code
Data
Error check
Function Code
(Hexadecimal)
Function
Command Message Response Message
Min.
(Bytes)
Max.
(Bytes)
Min.
(Bytes)
Max.
(Bytes)
03H Read memory register contents 8 8 7 37
08H Loopback test 8 8 8 8
10H Write multiple memory registers 11 41 8 8
PLC to Inverter
Inverter to PLC
PLC to Inverter
Command message
Response message
Command message
Time (Seconds)
24 bits long
5 ms min.
H5-06
setting
24 bits long
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