6.2 Plant changes in runtime
Plant changes in runtime
In addition to the options for replacing failed components in runtime as described in the section
titled "Failure and replacement of components during operation", the CPU (41x-xH) also
supports a system modification without interrupting the running program.
Requirements
● The relevant hardware components are suitable for insertion and removal under voltage.
● The H system with CPU is available.
Use cases for plant changes
A plant change in which the hardware of the plant is changes occurs in the following cases:
● Hardware components of a high availability system are removed.
● Hardware components of a high availability system are added.
● Hardware components of a high availability system are replaced by non-identical
components.
Plant modification always requires a software modification. Configuration changes are made
in HW Config and downloaded to the CPU. The modified hardware is physically replaced,
removed or added.
Similar to the events that occur when components are replaced, when the system is modified
in runtime, the functions of the modified components are taken over by the corresponding
redundant components. The running program is not interrupted.
Which components can be changed?
changes Possible modifications
Changes in the CPU
● Editing CPU Parameters
● Changes to the memory components of the CPU
Adding for removing mod‐
ules in central racks
● Communication modules
● Interface modules (for example, IM 460, IM 461), in de-energized
state only
Replacing components and plant changes
6.2 Plant changes in runtime
High Availability Process Control Systems (V9.0)
196 Function Manual, 05/2017, A5E39221836-AA
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