Siemens S7-1200 PROFIBUS - Page 37

Diagnostics and upkeep
5.1 Diagnostics
SIMATIC CM 1242-5
Operating Instructions, 01/2023, C79000-G8976-C245-06
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Byte 3: Variant "Interrupt specifier"
Table 5- 8 Structure of byte 3 of the device-specific diagnostics (variant "interrupt specifier")
Bit no.
Meaning
7...3
Seq_No
Unique identifier of an interrupt alarm
2 Add_Ack If this bit is set, the DP-V1 master is indicating that this interrupt
expects an acknowledgement in the form of a WRITE job.
1...0
Alarm_Specifier
0
No further distinction
1 Interrupt appears, slot disrupted
The slot generates an interrupt due to an error.
2 Interrupt disappears, slot OK
The slot generates the interrupt and indicates that it has no further
errors
3 Interrupt disappears, slot still disrupted
The slot generates the interrupt and indicates that it has further
errors
Byte 3: Variant "Status specifier"
Table 5- 9 Structure of byte 3 of the device-specific diagnostics (variant "status specifier")
Bit no.
Meaning
7...2
- reserved -
1...0
Status_Specifier
0
No further distinction
1
Status appears
2
Status disappears
3
- reserved -
Bytes 4...62: Module-specific diagnostics: General coding
This byte contains data with module-specific information that is described in the relevant
module documentation. The relevant module is identified by the slot (byte 2).
Bytes 4...62: Module-specific diagnostics with "status type" and "module status"
With the variant "status type" of the device-specific diagnostics of DP-V1 slaves (see byte 1,
bit 7) and the setting "Modul_Status" (see byte 1, bits 0...6), there are two status bits here for
each slot (= module). Bits not required are set to 0.