The CODESYS internal PLC is featuring a predefined amount of memory available for code, data and other resources.
Memory size can be read on CODESYS v2 workbench, opening "Resources" tab and then double click on the "Target Settings" icon into.
Memory layout is:
Memory layout for CODESYS v3 internal PLC is:
CODESYS v2 and v3 internal PLC
eTOP Series HMI