Siemens SIMATIC S7-400H Manual page 206

Failure and Replacement of Components During Operation
10.1 Failure and Replacement of Components in Central
Racks and Expansion Racks
Which components can be replaced?
The following components can be replaced during operation:
• central processing units – for example, CPU 417-4H
• power supply modules – for example, PS 405 and PS 407
• signal and function modules
• communication processors
• synchronization submodules and fiber-optic cables
• interface modules – for example, IM 460 and IM 461
10-2
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07