YASKAWA GA800 Series, Technical Reference

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Network
Communications
6
6.3 MEMOBUS/Modbus Communications
YASKAWA SIEPC71061737B GA800 Drive Technical Reference 279
Figure 6.11 Message Example When Writing to Multiple Holding Registers
Note:
The number of bytes set in the command message set the data quantity × 2 during the command message. The response message uses the
same formula.
■
Reading from More than One Holding Register/Reading the Indicated Register
The drive uses function code 5A (Hex.) to write to more than one register, then it reads the contents of four holding
registers at the same time.
The function for writing to more than one register is the same as the function for function code 10 (Hex.). You can
write to a maximum of 16 holding registers.
The four holding registers to be read from are specified in H5-25 to H5-28 [Function 5A Register x Selection] .
Table 6.6 shows example messages when you write to more than one holding register or when you read more than one
command register. Table 6.6 uses this register data for the examples:
•
The drive for slave 1 is set for Forward run with a frequency reference of 60.00 Hz.
•
The setting in H5-25 to H5-28 and the data in the specified holding registers are as follows.
–
H5-25 = 0044H: U1-05 [Motor Speed] = 60.00 Hz (6000 = 1770H)
–
H5-26 = 0045H: U1-06 [Output Voltage Ref] = 200.0 V (2000 = 07D0H)
– H5-27 = 0042H: U1-03 [Output Current] = 50% of drive rated current (100% = 8192, 50% = 4096 = 1000H)
–
H5-28 = 0049H: U1-10 [Input Terminal Status] = 00H
When you rewrite the parameter value with the write command through the H5-11 [Comm ENTER Command Mode]
setting, you must use the Enter command to save and enable the contents of the changes. Refer to H5-11: Comm
ENTER Command Mode on page 889 and Enter Command on page 282 for more information.
Table 6.6 Message Example When Reading from More than One Holding Register/Reading the Indicated Register
Byte
Command Message Response Message (when normal) Response Message (when there is a fault)
Setting Data
(Hex.)
Setting Data
(Hex.)
Setting Data
(Hex.)
0 Slave address 01 Slave address
01 Slave address 01
1 Function Code 5A Function Code
5A
Function Code DA