Siemens Simatic S7-300 Specifications Page 64
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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
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Always take into consideration that the cycle time of a user program is extended
by:
• Time-controlled interrupt handling
• Process interrupt handling (also refer to Chapter ,QWHUUXSWUHVSRQVHWLPH)
• Diagnostics and Error Handling
• Communication with programming devices (PGs), operator panels (OPs) and
via connected CPs (e.g. Ethernet, PROFIBUS-DP)
• Testing and commissioning routines, e.g. status/controlling of variables or block
status functions.
• Transfer and deletion of blocks, compressing user program memory
• Writing/reading the MMC, using SFC 82 to 84 in the user program
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The cycle time is made up of following influencing factors.
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The table below shows the time a CPU requires to update the process image
(process image transfer time). The times specified might be prolonged by interrupts
or by communication of the CPU.
The process image transfer time is calculated as follows:
Table 5-2 Formula for calculating the process image (PI) transfer time
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Base load K + Number of bytes in the PI in rack 0 x (A)
+ Number of bytes in the PI in rack 1 to 3 x (B)
+ Number of bytes in the PI via DP x (D)
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- Time slices (per 1 ms) 63
- Time slice (1 ms) 63
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