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Hello Monika
The programming of PLC is very simple if u have sufficient knowledge of relays and logic gates.The programming style which i learnt was Ladder logic diagrams(LLD) and the u can get the trial software named logixpro on net ,just download it..The LLDs are simple to built ,you just have to know what you want the output from PLC..If you have any problem regarding that feel free to contact me
yes there is an internal flash in R305 module that can store upto 256 fingerprints (Have you not read the manual).I am also working on the project of making attenndance management system using this same module.I am stuck at its coding part..If you have any information then please share with me .It would be appreciated