Different Cycle Times - Siemens CPU 31 Series Technical Data Manual

Extension of the cycle time due to error
Table 5-8
Type of error
312C
313C
313C2
314C-2
312
314
315
317
319
The interrupt OB processing time must be added to this extended time. The times required
for multiple nested interrupt/error OBs are added accordingly.
5.2.3

Different cycle times

Overview
The cycle time (T
cycle times T
interrupted by a time-of-day interrupt OB (here: OB 10).
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
Cycle time extension as a result of errors
Programming errors
600 μs
400 μs
400 μs
400 μs
600 μs
400 μs
400 μs
100 μs
19 μs
) length is not the same in every cycle. The figure below shows different
cyc
and T . T is longer than T
cyc1 cyc2 cyc2
Cycle and reaction times
I/O access errors
600 μs
400 μs
400 μs
400 μs
600 μs
400 μs
400 μs
100 μs
23 μs
, because the cyclically executed OB1 is
cyc1
5.2 Cycle time
5-7