3.9 Definition of the standby modes
Introduction
The availability of a system can be increased by additional components in the system (standby
components). The operating mode of these components distinguishes them from the
components that are active in process mode.
Standby operating mode
Operating mode Definition
Hot standby Hot standby means the parallel redundant processing of signals in redundant
components. This allows a bumpless switchover of the entire system to the
standby components.
Warm standby Warm standby means the fast continuation of the aborted function by standby
components at a program continuation point.
Cold standby Cold standby means that there is a component of the system available that can
be activated if a fault occurs. Following a restart, the newly activated component
takes over the function of the previously failed component.
Basics of high availability
3.9 Definition of the standby modes
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 31
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