VIPA 313-6CF03, Manual, Page: 118 / 152

Chapter 5 Deployment I/O periphery
Manual VIPA System 300S SPEED7
5-32 HB140E - CPU SC - RE_313-6CF03 - Rev. 07/45
Via the parameterization (record set 7Fh) you may activate a global
diagnostic interrupt for the analog and digital part.
A diagnostic interrupt occurs when during a hardware interrupt execution in
OB 40 another hardware interrupt is thrown for the same event. The
initialization of a diagnostic interrupt interrupts the recent hardware interrupt
execution in OB 40 and branches in OB 82 to diagnostic interrupt
processing
incoming
. If during the diagnostic interrupt processing other events
are occurring at other channels that may also cause a process res.
diagnostic interrupt, these are interim stored.
After the end of the diagnostic interrupt
processing at first all interim-stored
diagnostic interrupts are processed in the sequence of their occurrence
and then all hardware interrupts.
If a channel where currently a diagnostic interrupt
incoming
is processed res.
interim stored initializes further hardware interrupts, these get lost. When a
hardware interrupt for which a diagnostic interrupt
incoming
has been released
is ready, the diagnostic interrupt processing is called again as diagnostic
interrupt
going
.
All events of a channel between diagnostic interrupt
incoming
and diagnostic
interrupt
going
are not stored and get lost. Within this time window (1
st
diagnostic interrupt
incoming
until last diagnostic interrupt
going
) the SF-LED of
the CPU is on. Additionally for every diagnostic interrupt
incoming/going
an entry
in the diagnostic buffer of the CPU occurs.
Process alarm:
OB40:
without Diagnostic alarm:
OB40:
OB82:
OB40_8
OB82_8 OB82_3 OB82_8 OB82_3
Fast memory buffer Proz (FIFO):
OB40_3 OB40_6 OB40_14
3 3
6
3
6
14
6
14
14
Fast memory buffer (FIFO): 3 6 14
OB40_8 OB40_3 OB40_6 OB40_14
with Diagnostic alarm:
lost lost
3
Fast memory buffer Diag (FIFO):
3 8
14
incoming outgoing outgoing
8
Input channel: 8 3 8 3 6
14
3
8
8
8 3 6
14
OB40_3
lost
incoming
8
3 8 3
3
3 6 6
Diagnostic
interrupt
Example