Interrupts, diagnostics messages, error and system alarms
6.5 Device-specific diagnostics in DP-V1
CM 1542-5
Manual, 11/2014, C79000-G8976-C290-02
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6.5
Device-specific diagnostics in DP-V1
There are two variants of device-specific diagnostics with DP-V1 slaves:
●
Interrupt type
●
Status type
The two variants differ from each other in the coding of byte 1, bit 7 of the device-specific
diagnostics data. The difference is component-specific.
Byte 0: Header
The two most significant bits have the value 00. This identifies the "module-specific
diagnostics data" field (see bytes 4... 62) as a whole.
The remaining six bits indicate the length of the data field including byte 0.
Byte 1: Variant "Interrupt type"
Table 6- 6
Structure of byte 1 of the device-specific diagnostics (variant "interrupt type")
Bit no.
Meaning
7
Value
Meaning
0
Interrupt
6...0
Alarm_Type
0
- reserved -
1
Diagnostics interrupt
2
Hardware interrupt
3
Pull interrupt
4
Plug interrupt
5
Status interrupt
6
Update interrupt
7...31
- reserved -
32...126
Vendor-specific
127
- reserved -
If status interrupts are received in quick succession, older status interrupts may be
overwritten by newer interrupts.
