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Communication Error Codes
The following table shows MEMOBUS communications error codes.
Slave Not Responding
In the following cases, the slave ignores the write function.
• When a communications error (overrun, framing, parity, or CRC-16) is detected in the command message.
• When the gap between two blocks (8 bit) of a message exceeds 24 bits.
• When the command message data length is invalid.
Error Code Contents
01H
Function code error
A function code other than 03H, 08H, or 10H has been set by the PLC.
02H
Invalid register number error
• The specified register address does not exist.
• With broadcast sending, a start address other than 0001H, or 0002H has been set.
03H
Invalid quantity error
• The number of data packets (register content) being read or written is outside the range of 1 to 16.
• In write mode, the number of data bytes in the message is not No. of packets x 2.
21H
Data setting error
• A simple upper limit or lower limit error has occurred in the control data or when writing parameters.
• When writing parameters, the parameter setting is invalid.
22H
Write mode error
• Attempting to write parameters to the inverter during operation.
• Attempting to write via ENTER commands during operation.
• Attempting to write parameters other than A1-00 to A1-05, E1-03, or 02-04 when warning alarm CPF03 (defec-
tive EEPROM) has occurred.
• Attempting to write read-only data.
23H
Writing during DC bus undervoltage (UV) error
• Writing parameters to the inverter during UV (DC bus undervoltage) alarm.
• Writing via ENTER commands during UV (DC bus undervoltage) alarm.
24H
Writing error during parameters processing
Attempting to write parameters while processing parameters in the Inverter.
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