For PLC configurations that reach the performance limits of the selected CPU type, specific settings and parameters can be adjusted to optimize the performance. By applying these, the system load can typically be reduced.
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In the “PLC settings” tab, set the “Always update” variable setting to “Disabled”. ⮫ “Tab: PLC Settings ”
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Pay particular attention to the following:
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Increasing the “Update cycle time” in SM560.
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I/O update task (including cycle time).
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Task cycle time.
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Use the appropriate communication schema.
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Minimize the use of retain variables and access to retain variables.
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Verify that the tag update rate matches the application requirements. For example, temperature values should be updated every few seconds or minutes rather than every few milliseconds.