Hello ienecode, thank you for your comprehensive report.
In the screenshot log you could see config.rsc write failed.This is due to incorrect PlaceholderFilePath configured in /etc/CODESYSControl_User.cfg
The following reference is from release notes from RevolutionPiBridgeV1.4.1.99 beta:
In the Revolution Pi Library for CODESYS, file write access under the following folder, /etc/revpi/, is required to create a config.rsc file based on devices configured in the CODESYS application project. The CODESYS project using the KUNBUS RevolutionPiBridge IO library creates a configuration file /etc/revpi/config.rsc, which is basically the PiCtory file /var/www/revpi/pictory/projects/_config.rsc.
Customers using Revolution Pi CODESYS devices will therefore have to manually configure appropriate PlaceholderFilePath in /etc/CODESYSControl_User.cfg as mentioned below:
For CODESYS Control for Raspberry Pi MC SL - 4.8.0.0
Code: Select all
[SysFile]
PlaceholderFilePath.1=/etc/revpi, $configrsc$
For CODESYS Control for Raspberry Pi MC SL - 4.10.0.0
Code: Select all
[SysFile]
PlaceholderFilePath.2=/etc/revpi, $configrsc$
Note: When using CODESYS Control for Raspberry Pi MC SL - 4.10.0.0 you may be required
to increase the PlaceholderFilePath from default 1 to 2.This may be due to the CODESYS Control occupying this path internally.
CODESYS Forge - CODESYS Forge / Talk / Engineering 
: After un upgrade of "CODESYS Control for Raspberry Pi MC SL" from v4.7 to v4.9 SysFileOpen function stopped working
Restart CODESYS Control to load the new changes from /etc/CODESYSControl_User.cfg.
Alternatively, you could reboot the device, and the changes will be automatically loaded from the user configuration file at the start of CODESYS Control.
Code: Select all
sudo service codesyscontrol restart
: After un upgrade of "CODESYS Control for Raspberry Pi MC SL" from v4.7 to v4.9 SysFileOpen function stopped working 
