YASKAWA PROFIBUS-DP SI-P3 Technical Manual page 30

7 Conventional Formats

MEMOBUS/Modbus Message Area
In the MEMOBUS/Modbus message area, MEMOBUS/Modbus messages are transferred to the option, and the
parameters in the drive can be set, read, and monitored. Up to four data items can be written or read at one time.
The option edits the MEMOBUS/Modbus message internally and transfers the message to the drive after receiving the
message; more time is required to return the message. Use the handshaking register to synchronize sending or receiving
of the data between the PROFIBUS-DP master and the option.
Execute an Enter command to validate the written data and write a parameter to the drive. When F6-32 = 4, this parameter
is validated by writing the parameter to the drive and automatically executing the Enter command at the same time. Refer
to the MEMOBUS/Modbus Communications chapter of the drive Technical Manual for details on the Enter command and
for a list of monitor data using the MEMOBUS/Modbus message area.

Configuration of MEMOBUS/Modbus Command Message
Table 15 shows the configuration of MEMOBUS/Modbus command messages when the Extended Data 1 is selected.
Byte
16 Function code
17
Starting Resistor No.
18
19 Number of Data Items
20
Data 1
<1>
21
22
Data 2
<1>
23
24
Data 3
<1>
25
26
Data 4
<1>
27
28 to 30 Reserved
31 Handshaking Register
<1> Setting is needed only for the write command. Select 00H for the read command.

Configuration of MEMOBUS/Modbus Response Messages
Table 16 shows the configuration of MEMOBUS/Modbus response messages when the Extended Data 1 is selected.
Byte
16 Function code
17
Starting resistor No.
18
19 Number of data items
20
Data 1
<1>
21
22
Data 2
<1>
23
30
Table 15 MEMOBUS/Modbus Command Message
Name
MEMOBUS/Modbus command code:
03H: Read command (reading Drive internal data)
08H: Loop back
10H: Write command (writing data into the drive)
Other codes: Not supported.
Starting resistor No.
Sets the number of bytes to read or write (only 2, 4, 6, or 8 allowed)
Data word 1
Data word 2
Data word 3
Data word 4
Reserved
Refer to Handshaking Register on page 32
Table 16 MEMOBUS/Modbus Response Messages
Name
MEMOBUS/Modbus response codes
00H: Waiting for response from drive
03H: Response to read operation
10H: Response to write operation
83H: Read command error
90H: Write command error
Other codes: Not supported.
Starting resistor No.
Write: Set double number of written data items
Read: Set double number of read data items
Data word 1
Data word 2
YASKAWA ELECTRIC SIEP C730600 82D YASKAWA AC Drive Option SI-P3 Technical Manual
Refer to Handshaking Register on page 32
Function
Function
for details.
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
for details.
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte