Siemens CM 1542-5 Manual page 30

Interrupts, diagnostics messages, error and system alarms
6.5 Device-specific diagnostics in DP-V1
Byte 1: Variant "Status type"
Table 6- 7
Bit no.
7
6...0
Byte 2: Slot number
Slot number (1...n) of the slave module
0 is the placeholder for the entire device.
Byte 3: Variant "Interrupt specifier"
Table 6- 8
Bit no.
7...3
2
1...0
30
Structure of byte 1 of the device-specific diagnostics (variant "status type")
Value Meaning
1 Status information
Status_Type
0 - reserved -
1 Status information
2 Modul_Status (see also bytes 4...62)
3...31 - reserved -
32...126 Vendor-specific
127 - reserved -
Structure of byte 3 of the device-specific diagnostics (variant "interrupt specifier")
Seq_No Unique identifier of an interrupt alarm
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.
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 an interrupt and indicates that it has further
errors.
Meaning
Meaning
Manual, 11/2014, C79000-G8976-C290-02
CM 1542-5