C.11 Communication Errors - YASKAWA U1000 Series Technical Manual

C.11 Communication Errors

◆ MEMOBUS/Modbus Error Codes
A list of MEMOBUS/Modbus errors appears in
When an error occurs, remove whatever caused the error and restart communications.
Error Code
Function Code Error
01H
Attempted to set a function code from a PLC other than 03H, 08H, and 10H.
Register Number Error
02H
• A register number specified in the command message does not exist.
• Attempted to send a broadcast message using other register numbers than 0001H or 0002H.
Bit Count Error
• Read data or write data is greater than 16 bits. Invalid command message quantity.
03H
• In a write message, the "Number of Data Items" contained within the message does not equal twice the amount of data words (i.e., the total of Data 1+ Data
2, etc.).
Data Setting Error
21H
• Control data or parameter write data is outside the allowable setting range.
• Attempted to write a contradictory parameter setting.
Write Mode Error
• During run, the user attempted to write a parameter that cannot be written to during run.
22H
• During a control circuit error (CPF06), the master attempted to write to a parameter other than A1-00 to A1-05, E1-03, or o2-04.
• Attempted to write to read-only data.
Control Circuit Undervoltage Write Error
23H
During an undervoltage situation, the master attempted to write to parameters that cannot be written to during undervoltage.
Write Error During Parameter Process
24H
Master attempted writing to the drive while the unit was processing parameter data.
Writing into EEPROM Disabled
25H
An attempt was made to write data into EEPROM by MEMOBUS/Modbus communications when writing EEPROM is not possible. (If this error code occurs,
an error message is displayed and the drive continues operation.)
◆ Slave Not Responding
In the following situations, the slave drive will ignore the command message sent from the master, and not send a
response message:
• When a communications error (overrun, framing, parity, or CRC-16) is detected in the command message.
• When the slave address in the command message and the slave address in the unit do not match (remember to set the
slave address for the drive using H5-01).
• When the gap between two blocks (8 bit) of a message exceeds 24 bits.
• When the command message data length is invalid.
Note: If the slave address specified in the command message is 00H, all slaves execute the write function, but do not return response
messages to the master.
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Table C.8.
Table C.8 MEMOBUS/Modbus Error Codes
C.11 Communication Errors
Error Name
Cause
C
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