Siemens SIMATIC S7-1500 Manual page 13

Reference
For more information about "Displays" refer to the S7-1500 Automation System
(http://support.automation.siemens.com/WW/view/en/59191792) System Manual,
CPU display chapter. Removing and replacing the front cover is described in the section
on handling the front cover.
Locking the front cover
You can lock the front cover to protect your CPU against unauthorized access.
You can attach a security seal or a padlock with a diameter of 3 mm to the front cover.
Figure 2-3
CPU 1511-1 PN (6ES7511-1AK00-0AB0)
Manual, 01/2013, A5E31264526-AA
Locking latch on the CPU
Product overview
2.2 Operating and display elements
13