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SI 7 can be manipulated either through the ladder, or you can enter into "info mode" and change it.  To enter info mode, press and hold the 'i' button for 5 seconds.  When prompted for a password, the default password is '1111'.  Enter into "Data Types", then using the 1 and 6 keys, navigate to "System Ints" and hit enter.  Choose the address (address 7) and here you can manipulate the value.


Let us know if this helps. 

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