Failure And Replacement Of Components In Central Racks And Expansion Racks - Siemens SIMATIC S7-400H Manual

Failure and Replacement of Components During Operation
9.1 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
9-2
S7-400H Programmable Controller Fault-Tolerant Systems
A5E00068197-04