"PLC VAT demo" is a table for monitoring and modifying data value of PLC siemens just like "Variable Table"/VAT in step 7 simatic manager programming software. This tool is use when you want monitor or modify variable data value of remote PLC through WiFi. It is more practical using this table tool than create HMI or scada apps when you want monitor a lot of variable data. This is only for demo, so there are some limitation. You can buy the full version by the name of "PLC VAT" on google play store.
http://play.google.com/store/apps/details?id=com.teknonat.teknik.vat

limit for demo: