Managing FortiGate chassis devices
Select FortiManager systems can work with the Shelf Manager to manage FortiGate 5050, 5060, 5140, and 5140B chassis. The Shelf Manager runs on the Shelf Management Mezzanine hardware platform included with the FortiGate 5050, 5060, 5140, and 5140B chassis. You can install up to five FortiGate 5000 series blades in the five slots of the FortiGate 5050 ATCA chassis and up to 14 FortiGate 5000 series blades in the 14 slots of the FortiGate 5140 ATCA chassis. For more information on FortiGate 5000 series including Chassis and Shelf manager, see the Fortinet Document Library.
Chassis management

You need to enable chassis management before you can work with the Shelf Manager through the FortiManager system.
To enable chassis management:
1. In the System Settings tab, go to System Settings > Advanced > Advanced Settings . See Advanced settings for more information.
2. Under Advanced Settings , select Chassis Management .
3. Set the Chassis Update Interval ; the value can be from 4 to 1440 minutes.