Siemens Simatic S7-300 Manuel - Sayfa 13

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Siemens Simatic S7-300 Manuel
Hardware interrupt lost
In an interrupt has been buffered for a channel and another interrupt occurs on that
channel before it has been processed by the CPU, a diagnostic interrupt "hardware
interrupt lost" is triggered.
More interrupts on this channel are not acquired until processing of the interrupt
buffered on this channel has been executed.
Interrupt-triggering channels
The start information of OB 40 in the OB40_POINT_ADDR variable indicates
which channel triggered the hardware interrupt. Figure 4 shows the assignment to
the bits of the local data double word 8.
Byte
6/7
As of
8
LB 8
31 30 29 28 27 26
1
Edge change: channel 7
Figure 4
Start information of OB 40: which event triggered the hardware interrupt
Product Information on the Manual S7-300 Module Specifications, Edition 11/2002
A5E00213444-02
Variable
OB40_MDL_ADDR
OB40_POINT_ADDR
LB 9
25 24
23 22 21 20 19 18
1
1
1
1
Edge change: channel 15
Edge change: channel 0
Edge change: channel 1
Edge change: channel 2
Data type
WORD
B#16#0
DWORD
See
Figure 4
LB 10
17 16
1
1
1
Reserved
Edge change: channel 8
Edge change: channel 9
Edge change: channel 10
Description
Address of the
interrupt-triggering module
Indication of the
interrupt-triggering inputs
LB 11
1
Bit no.
0
LD 8
13