Siemens SIMATIC Panel PC IL 77 Operating Instructions Manual page 73

Opening the device
Accessing expansion modules
1 Remove the four screws (1).
Remove the 2 screws (2).
2 Lift the lid up and remove it.
Panel PC IL 77
Operating Instructions, Edition 10/2004, A5E00339979-01
Maintenance and servicing
10.2 Installing and removing hardware components
10-3