*1 Use stated version or newer with the version settings as described in the chart.
*2 Modbus RTU slave is not available.
*3 Modbus Server is not available.
*4 Version of configured slave (located under the Master in the project tree)
*5 Hotfix version due to iX download issue.
Persistent function (X2 control/extreme, BoX2 pro SC/BoX2
extreme SC)
The PLC functionality have support for storing non-volatile variables.
Those variabels can be stored dynamically in two different modes:
Power-fail mode (Default setting):
If the voltage drops below a hardware given threshold (that is, during a power loss or power dip),
the system instantly copies all persistent data defined in the PLC application from RAM into the
battery backed SRAM. They are verified and restored when the device is restarted.
Cyclic mode:
the PLC is instructed to store all retain and persistent data directly into SRAM synchronously
with every PLC cycle. This means all device types can use the whole available memory, which is
128 kiB. However, writing to the SRAM might increase the configured PLC cycle depending on
the size of used retain and persistent data, because a SRAM is naturally slower then a RAM.
This possible increase is dependent of the application and to find out about the possible increase
one would need to monitor the configured task(s) of the project.
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