Modbus slave error answer
When the user sends the slave either a request or information that the coupler does not understand, the slave responds with an error report. This answer contains the function and the error code. 0x80 is added to the value returned by the function.
|
Code |
Name |
Meaning |
|---|---|---|
|
1 |
ILLEGAL FUNCTION |
Modbus function not implemented |
|
2 |
ILLEGAL DATA ADDRESS |
Invalid address or length |
|
3 |
ILLEGAL DATA VALUE |
Invalid parameter |
|
4 |
SLAVE DEVICE ERROR |
Watchdog or K-Bus error |
|
6 |
SLAVE DEVICE BUSY |
Output data is already been received from another IP device |