Java app connection to Siemens PLC (read/write)

[misa1515]

Hello,
how can be possible to implement in Java application connection to Siemens PLC (read and write from/to DBs)?
1. S7-1500 (with or without CP modul),
- is required to use only non optimized DB, or can be used both optiminized and non optimized DBs?
2. S7-1200,
3. S7-300 (with integrated RJ45 connector or with CP modul),
4. Logo! (with integrated network port).

Thank you in advance.

[xflash]

snap7

http://snap7.sourceforge.net/

But not for optimized data blocks.

You could also try OPC UA.

[misa1515]

Thank you.
How can be used OPC UA, please?