Start sequence

As regards the start sequence of code 1131, the following is guaranteed:BOOT (in the cases envisaged)INITPeriodical and cyclic tasksThe following is guaranteed for periodical and cyclic tasks:FASTNORMALSLOWThe start sequence of periodical and cyclic tasks is not influenced by the periods configured: the first running of each task takes place immediately and is therefore determined by priority only.The BACKGROUND task on the other hand has an undefined placement: being at the lowest level of priority of the system, its running, including the first time, is strongly conditioned by the availability of UPC time granted by all the tasks (PLC and others) in the system. In practice, in particularly favourable conditions, it could occur before FAST; while in unfavourable conditions it could start last and even with a certain delay compared to the other tasks.Attention: the I/O management of the HW devices configured, whether installed on local bus or acquired through a fieldbus, is activated after running the INIT task when starting the user application program.Attention: the availability of the I/O of the HW devices configured, whether they are installed on local bus or acquired via a fieldbus, is not guaranteed the first time the periodical and cyclic tasks are run. The user program has to check through the interfaces prepared that this condition occurs according to the needs of the application (launch with partial availability of the I/O).