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S7-1200-1500-Notes.md

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+This is taken directly from Snap7 documentation: http://snap7.sourceforge.net/
+
+## S7 1200/1500 Notes
+
+An external equipment can access to S71200/1500 CPU using the S7 “base” protocol, only working as an HMI, i.e. only basic data transfer are allowed.
+All other PG operations (control/directory/etc..) must follow the extended protocol, not (yet) covered by Snap7.
+Particularly to access a DB in S71500 some additional setting plc-side are needed.
+
+1.    Only global DBs can be accessed.
+2.    The optimized block access must be turned off.
+3.    The access level must be “full” and the “connection mechanism” must allow GET/PUT.
+
+Let’s see these settings in TIA Portal V12
+DB property
+Select the DB in the left pane under “Program blocks” and press Alt-Enter (or in the contextual menu select “Properties…”)
+Uncheck Optimized block access, by default it’s checked.
+ ![protection](https://github.com/killnine/s7netplus/blob/master/Documentation/protection.png)
+
+## Protection
+
+Select the CPU project in the left pane and press Alt-Enter (or in the contextual menu select “Properties…”)
+In the item Protection, select “Full access” and Check “Permit access with PUT/GET ….” as in figure.
+  
+![protection2](https://github.com/killnine/s7netplus/blob/master/Documentation/protection%202.png)

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-a