Eaton easyE4 Manual page 529

6.2.3 IT - Time-controlled interrupt function block
6.2.3.1 General
6.2.3.2 Operating principle
Only possible with easySoft 7.
easyE4 base devices provide 8 time-controlled interrupt function
blocks, IT01 through IT08. This does not apply to the EDP pro-
gramming language.
easyE4 makes it possible to quickly respond to various events. This
makes it possible, for instance, to switch outputs on or off outside of
the main program's routine. Only bit operators are allowed within an
interrupt program.
Time-controlled interrupt function blocks can be used in on-delayed
mode or interval mode.
Execution time for an interrupt
The time between the moment the event is detected and the moment
there is a response at a device output is < 1 ms. Accordingly, QP -
Physical output on base device must be set in the interrupt program.
If multiple interrupts are executed simultaneously, the times add up.
In total, no more than 8 interrupt sources are allowed to
be processed in a single program. The valid interrupt
sources are the IC, IE, IT interrupt function blocks and
the CF, CH, and CI high-speed counters that are directly
connected to the device inputs.
If there are multiple interrupt requests present sim-
ultaneously, the first detected interrupt program will be
executed, after which the remaining ones will be
executed based on the corresponding order.
A reference value is set at function block input PD. As soon as function block input EN
is set to 1, the time measurement starts. Depending on the operating mode being used,
the system will jump to the interrupt program once or repeatedly as soon as the spe-
cified time at function block input PD is reached.
Interaction between main program and interrupt program
The states of function block inputs IT_I1 through IC_04 are passed to the interrupt pro-
gram, where they can be processed further as I01 through I04.
Function block outputs IT_Q1 through IC_Q4 can be set from the interrupt program. The
corresponding interrupt program outputs are Q01 through Q04.
Main program
easyE4 10/19 MN050009 EN www.eaton.com
Interrupt program
6. Function blocks
6.2 interrupt function blocks
525