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Dear Automation Experts
is there any limitation using TIA portal for programming S7- 300 & 400 PLC
thanks for your answer
You're only limited by your imagination and knowledge...
https://support.industry.siemens.com/cs/document/106656707/the-tia-portal-tutorial-center-(videos)?dti=0&lc=en-WW
There is no other way to program those PLCs.