PersistentVars

[Akizildas]

Hi.I use codesys and PL700 PLC. When I cut the power Retain variable go to zero. I declarate variable for example:

VAR_GLOBAL PERSISTENT RETAIN
scaAkuSP :INT;
END_VAR

VAR_GLOBAL RETAIN
scaAkuSP:int;
END_VAR

How can i do it.

[Pixsys tecnico 1]

Hi,
please go to "[PL700] CODESYS programming examples" section and take a look to the example number 7.
https://forum.pixsys.net/viewtopic.php?f=25&t=2642

To manage retain variables, you need to use the Persistent Manager service.

[Akizildas]

How long can the plc keep its variable value in memory when it is not powered?

[Pixsys tecnico 1]

Hi,
memory file is stored in a EMMC flash memory type so the duration is almost infinite.