Eaton easyE4 Manual page 535

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Device inputs

Automatically assigns the user interrupts 1 to 8 that are still available (only for instances

of I01 – I08 that are not in use by other function blocks)

The time between the moment the triggering signal is detected and the moment there is

a response at an output is < 1 ms. If multiple interrupts are executed simultaneously,

the times add up.

Measuring the interrupt load

The runtime for each interrupt source is measured in µs. All measured times are added

over a period of 100 ms. After each 100 ms, the total of all times is evaluated and the

time measurement is cleared. If the interrupts used up more than 50% of the computing

time, the application will be stopped.

The <System_CPU_overload> diagnostic message will be generated and ID19 will be

For more information on how diagnostic messages can be called and processed,

please refer to

Available fixes for high interrupt loads

If the interrupt load becomes too heavy, the following steps can be taken to reduce it:

Reduce the number of function blocks

Keep the interrupt routine as short as possible

Reduce frequencies when using counters

Example of a time-controlled interrupt function block in easySoft 7

Output Q4 needs to be reset after a specific time. This time should be independent from

the main program's cycle time so that the switch-off point in time is always the same.

easyE4 10/19 MN050009 EN www.eaton.com

6. Function blocks

6.2 interrupt function blocks

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