Reading inputs data and writing output data from/to bus

PLCnext Engineer
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Hello colleagues, please, can you explanate me on added picture, what exactly means ‘Update Task cyclic 10’ and ‘Trigger Task Cyclic 10’? In my case I need be sure, that before the start of the task are readed the input data from the bus and after the end of the task are writen the output data to the bus. Is it the right setting or not? UpdateTaskTriggerTask Thanks, Roman

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Hi Roman, In your case - where you are interested in the timing of the I/O updates - the important setting is the “Trigger task”. The I/O will be exchanged at the start/end of the task that you select there. The other setting - the “Update Task” - does not relate directly to I/O, but instead to the global variables that start with AXIO (you can get this hint by hovering over the information symbol). 2020 07 15 16 01 16 These AXIO variables (below) are diagnostics variables, so it is probably OK in most cases to update these variables at a slower rate, perhaps at the default 50ms: 2020 07 15 16 07 28 Incidentally, there are similar settings:

                                             * in the controller Settings window, where you can select how frequently **ESM** variables are updated in the global data table.
                                             * in the Profinet Settings window, where you can select how frequently **PNIO** and **PND_S** variables are updated in the global data table.
                                             * in the HMI Settings window, where you can select how frequently **HMI** variables are updated in the global data table.

Hope this helps. ~ Martin.

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Great, thanks! Roman