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I/O Variables mapped from an I/O device do not change value.
values are greyed
Since SP17, some clearer hints are given:
By default, a variable is shown with the actual value only if the variab= le is used in a task.
Your options are either:
Note
The "Always update variables" setting is on the "<Name> I/O Mappin= g" tab for most devices.
For the PLC Controller devices, it is on the "PLC Settings" tab.