When GX IEC Developer compiles the project, it automatically inserts, program branching
instructions, into the program, in line with event driven tasks.
A Task can have more than one POU assigned to it, typically, a task where Event = True, would
contain all POU’s which needed to operate every scan of the PLC. A POU of a particular name
cannot be assigned to more than one task in any one project.
NOTE
Any POU’s not assigned to Tasks, ARE NOT SENT TO THE PLC during program transfer.
Don’t forget – this applies to the default download. Tasks can be prioritised, either on a time
or interrupt basis.
The Task Pool contains all the assigned tasks in the project.
The Task Pool allows the user to efficiently manage the PLC scan, ensuring that only the rou
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tines that require scanning are executed. It also provides an easy method of allocating specific
routines to events and timed or priority interrupts.
Software Structure and Definition of Terms Programming
3-8 MITSUBISHI ELECTRIC
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