Diagnosis Data¶
The diagnosis data section contains one diagnostic message with the following structure (according to AC500 diagnosis):
| Byte Number | Description | Possible Values |
|---|---|---|
| 1 | Diagnosis Byte, slot number | 31 = CI52x-MODTCP (e. g. error at integrated 8 DI / 8 DO) |
| 1 = 1:sup:st connected S500 I/O Module | ||
| … | ||
| 10 = 10:sup:th connected S500 I/O Module | ||
| 2 | Diagnosis Byte, module number | According to the I/O bus specification passed on by modules to the fieldbus master |
| 3 | Diagnosis Byte, channel | According to the I/O bus specification passed on by modules to the fieldbus master |
| 4 | Diagnosis Byte, error code | According to the I/O bus specification Bit 7 and Bit 6, coded error class 0 = E1 1 = E2 2 = E3 3 = E4 Bit 0 to Bit 5, coded error description |
| 5 | Diagnosis Byte, flags | According to the I/O bus specification Bit 7: 1 = coming error Bit 6: 1 = leaving error |
| 6 | Reserved | 0 |
If a diagnosis message is read out, the next one will be automatically filled in.
If no more diagnosis messages are available the buffer will be reset to zero.
This ensures that each diagnosis message can be delivered to the MODBUS TCP client/slave and no diagnosis will be lost.