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Cycle and Response Times

9-8

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

9.3 Interrupt response time

Interrupt response time – a definition

The interrupt response time is the time from the first occurrence of an interrupt

signal to the call of the first instruction in the interrupt OB of the IM 151-7 CPU.

The following generally applies: Interrupts of higher priority have precedence. This

means that the program processing time of the higher-priority interrupt OB and of

the not yet processed interrupt OBs of the same priority which occurred previously

(queue) is added to the interrupt response time.

Interrupt response times

Table 9-5 Interrupt response times of the IM 151-7 CPU (without communication)

Interrupt response times (without communication)

for...

Duration

Process interrupt, diagnostic interrupt Less than 20 ms

Process interrupt handling

Process interrupt handling begins when the process interrupt OB 40 is called.

Higher-priority interrupts cause the process interrupt handling routine to be

interrupted. Direct accesses to the I/Os are made at the execution time of the

instruction. After process interrupt handling has been completed, either cyclic

program scanning is continued or additional interrupt OBs of the same priority or a

lower priority are called and processed.

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