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Generic Retain Data Manager
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codefailed Project Members: Ingoaliazzz (admin)i-campbell Provides your code with a Generic Retain Data Manager. This code is especially useful on any machine that does not support FLASH or Battery backed up RAM. It enables you to use CODESYS VAR RETAIN via a save-file on a machine that normally does not support this via hardware. Usecase can be any SBC or PC without SRAM support (i.e. a bare metal Raspberry Pi) Just provide a path and a file name ( E.g.: '/Retain/Data') Your application's RETAIN declared data will be saved to this file on disk. Works by calculation a CRC32 value from the RETAIN data. If the RETAIN data changes, the CRC32 changes. Whenever the CRC32 changes, the manager is triggered to save the data to the specified file. Forced save A save can be "forced" from the application (e.g. from an FB_Exit or some UPS trigger for a graceful last-resort save). Cooldown period A cooling down period between consecutive saves can be set (default 5s). Even if data is changed during the cooling down period, the data only gets saved after each cooling down period. Any intermediate value changes are ignored. RETAIN data behavior after a startup etc The usual behaviour of retain data applies, see https://help.codesys.com/webapp/_cds_preserve_data_with_retain_variables;product=codesys;version=3.5.15.0#behavior Disclaimer I found this piece of code on the Internet. Kudos go to the original poster. It's very useful so I decided to box it and share it without any liability. Any copyright infringements are not intended.
Last updated: 2020-05-21
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