|
Error codes (hex) |
Name |
Meaning |
|---|---|---|
|
01 |
Illegal Function |
Use of a function code that is not supported |
|
02 |
Illegal Data Address |
Use of an invalid storage address or attempt to write to a read-only address |
|
03 |
Illegal Data Value |
Use of illegal data values, e.g. a non-permitted number of registers |
|
04 |
Slave Device Failure |
Unrecoverable failure |
|
05 |
Acknowledge |
The server needs a long time for processing the request. It sends an acknowledge in order to prevent a timeout of the client. |
|
06 |
Slave Device Busy |
Currently, the device cannot process Modbus commands |
|
0A |
Gateway Path Unavailable |
Gateway is overloaded or configured incorrectly |
|
0B |
Gateway Target Device Failed to Respond |
Error message of the gateway: No answer from the addressed device |