Cycle and Response Times
7-9
ET 200S Interface Module IM 151/CPU
A5E00058783-01
7.3 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/CPU.
It generally applies that the interrupt response time is increased by the program
scanning time of the interrupt OBs that have not yet been processed.
Interrupt Response Times
Table 7-6 Interrupt Response Times of the IM 151/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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