Variable Data type DescriptionOB81_EV_CLASS BYTE Event class and identifiers:39h: incoming eventOB81_FLT_ID BYTE Error code:22h: Back-up voltage missingOB81_PRIORITY BYTE Priority class:28 (mode STARTUP)OB81_OB_NUMBR BYTE OB-NR. (81)OB81_RESERVED_1 BYTE reservedOB81_RESERVED_2 BYTE reservedOB81_RACK_CPU WORD Bit 2 ... 0: 000 (Rack number)Bit 3: 1 (master CPU)Bit 7 ... 4: 1111 (fix)OB81_RESERVED_3 BYTE reservedOB81_RESERVED_4 BYTE reservedOB81_RESERVED_5 BYTE reservedOB81_RESERVED_6 BYTE reservedOB81_DATE_TIME DATE_AND_TIME Date and time of day when the OB was calledInformation to access the local data can be found at the description of the OB 1.6.9.3 OB 82 - I/O_FLT1 - Diagnostic Interruptn The system diagnostic is the detection, evaluation and reporting of messages whichoccur within a PLC system. Examples of errors for these messages could be errors inthe user program, module failures or wire breaks on signalling modules.n If a module with diagnostic capability for which you have enabled the diagnostic inter-rupt detects an error, it outputs a request for a diagnostic interrupt to the CPU onincome and outgoing event. The operating system then calls OB 82.n The local variables of OB 82 contain the logical base address as well as four bytes ofdiagnostic data of the faulty module.n If OB 82 has not been programmed, the CPU changes to the STOP mode. You candelay the diagnostic interrupt OB with SFC 41 DIS_AIRT or disable the delay withSFC 42 EN_AIRT.All diagnostic events reported to the CPU operating system are entered in the diagnosticbuffer in the order in which they occurred, and with date and time stamp. This is a buf-fered memory area on the CPU that retains its contents even in the event of an overallreset.n This diagnostic buffer is a ring buffer and offers at the CPUs of VIPA space for 100entries.n When the diagnostic buffer is full, the oldest entry is overwritten by the newest.n If you are online with the CPU, you can read out the diagnostic buffer by means of thePLC functions of the Siemens SIMATIC Manager. Besides of the standard entries inthe diagnostics buffer, the VIPA CPUs support some additional specific entries asevent-IDs. More information may be found in the manual of the CPU at "Deploymentof the CPU ..." at "Diagnostic entries".DescriptionDiagnostic in ring bufferVIPA SPEED7 Organization BlocksAsynchronous error Interrupts > OB 82 - I/O_FLT1 - Diagnostic InterruptHB00 | OPL_SP7 | Operation list | en | 18-30 87
