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6-6
6-3 Special Remote I/O Errors
H Special Remote I/O Errors
If each function is not set properly using the special remote I/O, the MSB of the function code will be
changed to 1 and one of the following error codes will be returned. Check the meaning of the error mes-
sage, and either correct the message or adjust the timing of the message.
Error Code Meaning
--- Normal operation response.
When sending data, the code will be returned with the function code and register number
followed by the amount of data being written or read data.
01 Function code error: A function code that is not supported has been received.
02 Invalid register number: A register number that is not registered has been received.
21 Data setting error: The data is outside the specified range or does not comply with the
constant restrictions.
22 Write mode error: Attempted write during operation, during UV, or while there was a CPU
Unit error, or attempted write to a read-only register.
24 Attempted write during constant processing (busy status).
Note The MSB of the function code will be returned as 1 when there is a communications failure.
H Enter Command
When entering data in the parameter constant (register No. 0100 or higher), be sure to send an enter
command. If the enter command is not transmitted after writing data, the following situation will occur.
• Written data will not be enabled.
Written data will be enabled only after an enter command is sent.
• Inverter will not start.
The Inverter will determine the state as being under programming until it receives an enter command
and will ignore the start or run command.
After sending an enter command, input the start or run command again.
Communications Errors Chapter 6