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6 Diagnostics and Interrrupts of the CP 343-2

105

CP 343−2 / CP 343−2 P AS−Interface Master

Release 08/2008

C79000−G8976−C149−04

S All changes to the AS-i slave configuration in the protected mode

S AS-i Power Fail in the protected mode

CP-internal interrupt events:

S EEPROM Error

Note

CP-internal interrupt events are always events entering the state. After a

CP-internal interrupt event occurs, the group error bit remains = TRUE. This is

only reset again after a restart on the S7-300.

6.3 Sequence of Diagnostic Interrupt Processing

If the CP 343-2 detects an interrupt event, it triggers a diagnostic interrupt. The

PLC CPU finds the source of the interrupt and reads data record 0 from the CP. It

then interrupts the cyclic user program and behaves as follows:

S If OB82 is not programmed, the PLC CPU changes to STOP as the default

reaction.

S If organization block OB82 his programmed, this is started. DS 0 is available in

the local data bytes 8 to 11 in the local data area of OB82. It is possible (but not

necessary) to read DS 1 that contains the delta list in OB82 using an SFC call

(SFC 51 “RDSYSST” or SFC 59 ”RD_REC”). When OB has been executed, the

PLC CPU acknowledges the diagnostic interrupt on the CP 342-2.

If interrupt events occur in a status in which they cannot be signaled by triggering a

diagnostic interrupt (for example, when the PLC is in the STOP mode or when an

older diagnostic interrupt is not yet been acknowledged), the CP 343-2 behaves as

follows:

S As soon as it becomes possible to trigger a diagnostic interrupt again, and if the

total CP configuration (in other words, AS-i slave configuration and CP-internal,

interrupt-relevant state) at this point in time is not the same as the configuration

signaled earlier with the diagnostic interrupt, a diagnostic interrupt with the

current configuration information is triggered.

S When it becomes possible again to trigger a diagnostic interrupt and if the total

CP configuration is the same as signaled earlier with the diagnostic interrupt, no

diagnostic interrupt is triggered. This means that brief slave failures (for

example, a bad contact) can go unnoticed.

CP-external interrupt events:

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Siemens CM343 Series Manual de servicio Pagina 105