Description 
  1.7 Safety  notes 
D4x5 
Manual, 03/2007 Edition 
23 
1.7  Safety notes 
Note the following safety information when working with the control unit and its components. 
 
 
Caution 
An option board may only be inserted and removed when the control unit and option board 
are disconnected from the power supply. 
 
 
 
Notice 
The 80 mm clearances above and below the components must be observed. The unit 
protects itself from overheating by shutting down. 
 
 
 
Caution 
The Compact Flash card may only be inserted or removed when the control unit is 
disconnected from the power supply.