5 Programming  HIMax System 
HI 801 001 E Rev. 4.01  Page 56 of 122 
To make one of the system variables Force Deactivation, Read-only in Run or Reload 
Deactivation operable with the key switch: 
1.  Assign a global variable to a system variable. 
2.  Assign the same global variable to a digital input. 
3.   Connect a key switch to the digital input. 
The position of the key switch defines the the system variable value. 
One key switch can be used to control several system variables.