The best way for me to add something to .dat is: 1. Deploy only HMI (not yet change to PLC). 2. already existing values come from PLC to HMI, new values are empty in HMI. 3. Save new .dat from HMI. 4. PLC recognizes the problem of not matching values in .dat. 5. change PLC. 6. compare old and new .dat about correct values.
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