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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
5-16 A5E00105475-03
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The (longest) response time is the sum of:
• 2 x process image transfer time for the inputs +
• 2 x process image transfer time for the outputs +
• 2 x operating system processing time +
• 2 x program processing time +
• 4 x the runtime of DP Slave message frames (includes processing in the DP
Master) +
• I/O delay
The result is equivalent to twice the cycle time + input and output delay + twice the
bus runtime.
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Calculating method for calculating the cycle/response time.
Reducing the response time with direct I/O access
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You can reach faster response times with direct access to the I/O in your user
program, for example with
• L PIB or
• T PQW
you can partially avoid the response times described above.
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You can also achieve fast response times by using process interrupts. Refer to the
following chapters.
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