Siemens SIMATIC ET 200SP Manuel - Page 30

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Interrupts, diagnostics, error, and system messages

5.2 Interrupts

5.2.2

Triggering a hardware interrupt

If there is a process interrupt, the CPU interrupts user program execution and processes the

process interrupt block OB 40. The result that triggered the interrupt is added to the start

information of the hardware interrupt block.

Note

Diagnostics "Hardware interrupt lost" (from I/O module)

Avoid creating hardware interrupts cyclically.

If the hardware interrupt load is too high, hardware interrupts can get lost depending on the

number of I/O modules and the communication load.

5.2.3

If there is a swapping interrupt, the CPU interrupts user program execution and processes

the process interrupt block OB 83. The result that triggered the interrupt is added to the start

information of OB 83.

IM 155-6 PN ST interface module (6ES7155-6AU00-0BN0)

Manual, 12/2014, A5E03576904-AC