6. Function blocks
6.2 Interrupt function blocks
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.
While the interrupt program is being processed, any other
incoming interrupts at the function block inputs of the same
instance will not be detected.
6.2.1.2 Operating principle
A reference value is set at function block input SV. Depending on the operating
mode, the function block will be assigned one or two of device inputs I1 through I8 in
the corresponding parameters (at least one of them will be set as a counter input in
the parameters). If the counter input reaches the reference value, the interrupt will
be triggered. The system will switch from the main program to the interrupt program
and the latter will be processed.
Interaction between main program and interrupt program
The states of function block inputs IC_I1 through IC_04 are passed to the interrupt
program, where they can be processed further as I01 through I04.
Function block outputs IC_Q1 through IC_Q4 can be set from the interrupt program.
The corresponding interrupt program outputs are Q01 through Q04.
main program
interrupt program
Fig. 256: Input and output states being passed between the main program and interrupt program
If an output is defined as a physical output on base device in the parameters for the
interrupt program, the output will be assigned an identifier of QP01 – QP04 and will
act directly on device output Q1 – Q4.
easyE402/24 MN050009ENEaton.com
563
To Next Page
Loading...
Need help?
General