This binding for openHAB has ability to connect Simatic PLC over Ethernet with isoTCP. So it should be possible to connect to the Simatic PLC S7-300, S7-400, S7-1200 and S7-1500 series.
Binding uses libnodave library to provide connection (https://sourceforge.net/projects/libnodave/).
More about this can be found on wiki page: https:/docbender/openHAB-Simatic/wiki
Compiled binding is inserted into release branch: https:/docbender/openHAB-Simatic/releases
Binding is working with openHAB 1.8.