Name: Siemens SIMATIC S7-300 Module data
Brand: Siemens
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Cycle and reaction times

5.2 Cycle time

CPU 31xC and CPU 31x, Technical data

Manual, Edition 08/2004, A5E00105475-05

5-3

Sequence of cyclic program processing

The table and figure below show the phases in cyclic program processing.

Table 5-1 Cyclic program processing

Step Sequence

1 The operating system initiates cycle time monitoring.

2 The CPU copies the values of the process image of outputs to the output modules.

3 The CPU reads the status at the inputs of the input modules and then updates the

process image of inputs.

4 The CPU processes the user program in time shares and executes program instructions.

5 At the end of a cycle, the operating system executes queued tasks, for example, loading

and deleting blocks.

6 The CPU then returns to the start of the cycle, and restarts cycle time monitoring.

Cycle time

Time slices (1 ms each)

Time slice (1 ms)

In contrast to S7-400 CPUs, the S7-300 CPUs data only allow data access from an OP / TP

(monitor and modify functions) at the scan cycle check point (Data consistency, see the

Technical Data). Processing of the user program is not interrupted by the monitor and modify

functions.

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