YASKAWA GA800 Technical Reference page 348

6.3 MEMOBUS/Modbus Communications
Error Code
Name
(Hex.)
22 Write Mode Error
DC Bus Undervoltage Write
23
Error
Error Writing Data During
24
Parameter Processing
Writing into EEPROM
25
Disabled
■
No Response from Slave
The slave ignores the command message from the master and will not send a response message in these conditions:
• When a communications error (overrun, framing, parity, CRC-16) is detected in the command message.
• When the slave address in the command message and the slave address for the drive side do not agree (Use H5-01
[Drive Node Address] to set the slave address of the drive)
• When the time interval between the data of which the message is composed is longer than 24 bits
• When the data length for the command message is not accurate
Note:
• If the keypad shows CALL [Serial Comm Transmission Error], refer to "Troubleshooting" to remove the cause of the error, and try to do
communications again. If the keypad does not show CALL, check U1-19 [MEMOBUS/Modbus Error Code] for the error and error type.
• If you execute the write function code when the slave address in the command message is 00 (Hex.), all of the slaves will execute the write
command, but they will not send response messages to the master.
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• Tried to write a disabled parameter during run.
• When there was a CPF06 [Control Circuit Error], the master tried to write a parameter other than one of these:
– A1-00 [Language Selection]
– A1-01 [Access Level Selection]
– A1-02 [Control Method Selection]
– A1-03 [Initialize Parameters]
– A1-04 [Password]
– A1-05 [Password Setting]
– E1-03 [V/f Pattern Selection]
– o2-04 [Drive Model (KVA) Selection]
• Writes the read-only data.
During Uv [DC Bus Undervoltage], a Uv write disabled parameter was written.
Tried to write a parameter from the master during parameter processing on the drive side.
Writing into EEPROM write is disabled, but EEPROM write was executed from MEMOBUS/Modbus communications. When this
error occurs, the keypad shows a message and the drive continues operation.
Cause
YASKAWA SIEPC71061737D GA800 Drive Technical Reference