YASKAWA Varispeed E7 Instruction Manual And Parameter Description page 208

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.
Slave address
Function code
Data
Error check
The space between messages must meet the following conditions:
PLC to Inverter
Command message
24 bits long
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.
Function Code
(Hexadecimal)
03H Read memory register contents
08H Loopback test
10H Write multiple memory registers
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.
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Inverter to PLC
Response message
H5-06
24 bits long
setting
Fig 6.45 Message Spacing
Command Message
Function
(Bytes)
Individual Functions
PLC to Inverter
Command message
Time (Seconds)
5 ms min.
Response Message
Min. Max. Min.
(Bytes) (Bytes)
8 8 7
8 8 8
11 41 8
Max.
(Bytes)
37
8
8
71
6-