C.8 Message Examples
456 YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
◆ Writing to Multiple Registers
Function code 10H allows the user to write multiple drive MEMOBUS/Modbus registers with one message. This process
works similar to reading registers, in that the address of the first register to be written and the data quantity are set in the
command message. The data to be written must be consecutive so that the register addresses are in order, starting from the
specified address in the command message. The data order must be high byte then lower byte.
The following table shows an example of a message where a forward (Up) operation has been set with a speed reference
of 100.00% for the slave 1 drive.
If parameter values are changed using the Write command, an Enter command may be necessary to activate or save the
data depending on the setting of H5-11. Refer to H5-11: Communications Enter Function Selection on page 450 and
Refer to Enter Command on page 468 for detailed descriptions.
Note: Double the number of the data quantity for the number of bytes in the command message.
◆ Torque Compensation Through MEMOBUS/Modbus Communications
Perform the steps below to utilize Torque Compensation Through MEMOBUS/Modbus Communications.
■
Torque Compensation Set-up via MEMOBUS/Modbus
1. Set H3-02 or H3-10 to 14 (Torque Compensation).
2. Set bit 3 (Torque Compensation Input) in the 000FH MEMOBUS/Modbus register to 1.
3. Before entering a run command, set the 0005H MEMOBUS/Modbus register (Torque Compensation, signed) to
an appropriate value.
Note: Settings for the 0005H register can be made before entering a run command.
■ Troubleshooting Torque Compensation Set-up via MEMOBUS/Modbus
1. If an error message occurs when sending the torque compensation value, check to see if RTS control has been
enabled or not (H5-07).
2. Verify that bit 3 in the 000FH MEMOBUS/Modbus register is set to 1 and that the function selection for terminal Al
or A2 (H3-02 or H3-10) is set 14 to enable/select torque compensation.
Command Message Response Message (normal) Response Message (fault)
Slave Address 01H Slave Address 01H Slave Address 01H
Function Code 10H Function Code 10H Function Code 90H
Starting No.
Upper 00H
Starting No.
Upper 00H Error Code 02H
Lower 01H Lower 01H
CRC-16
Upper CDH
Data Quantity
Upper 00H
Data Quantity
Upper 00H Lower C1H
Lower 02H Lower 02H
Number of Bytes 04H
CRC-16
Upper 10H
Starting Data
Upper 00H Lower 08H
Lower 01H
Next Data
Upper 27H
Lower 10H
CRC-16
Upper 79H
Lower 9FH
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