S7 1200/1500 notes

To access the DB in S71200/1500, some additional settings in 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.

Set the previous in TIA Portal (shown version V12)

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 is checked).

How to

Select the CPU project in the left panel 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 pictured.