PlcValue and derivates like PlcInt16, PlcInt32, PlcBoolean or PlcBooleanArray raise the Changed event to notify value changes. This event is raised whenever the Value property has been changed.
This event is raised under the following conditions:
This event isn't raised under the following conditions:
If it is necessary to be informed about every change to the process image in the PLC, it is possible to carry out an initial read operation of the PlcValue instances. If the EventHandler is then registered to the Changed event and relevant changes (e.g. through polling) are read regularly, the EventHandler is also executed with every change.