Siemens SIMATIC S7-300 Reference Manual page 117

Programmable logic controllers module data

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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 channel triggered by the hardware interrupt is entered in the start information

of the OB 40 in the OB40_POINT_ADDR variable. Figure 3-9 shows the

assignment of the bits to the local data double word 8.

31 30 29 28 27 26

Edge change: Channel 7

Start Information of OB 40: Which Event Has Triggered the Hardware Interrupt at the Limit

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

OB40_MDL_ADDR

OB40_POINT_ADDR

23 22 21 20 19 18

Edge change: Channel 15

Edge change: Channel 0

Edge change: Channel 1

Edge change channel 2

Edge change: Channel 8

Edge change: Channel 9

Edge change channel 10

Digital Modules

Address of the interrupt

triggering module

Display of the interrupt

triggering inputs

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