Replacing components and plant changes
6
6.1 Failure and replacement of components
6.1.1 Replacement of SIMATIC components in runtime
Continuous operation
A crucial factor for continuous operation of high availability process control systems is the
replacement of faulty or failed components in runtime. Replacement of defective components
is only possible if high availability components are used. The redundant components continue
to operate and supply the function until the replacement is made. The system is no longer high
availability in this condition.
Which components can be replaced in central controllers?
The following components in a redundantly configured automation system can be replaced in
runtime:
● Central processing units (e.g., CPU 410-5H)
● Power supply modules (e.g., PS 405, PS 407)
● Communication modules
● Synchronization modules and fiber-optic cables
● Interface modules (e.g., IM 460, IM 461)
Which components of the distributed I/O can be replaced?
The following components in a redundantly configured distributed I/O system can be replaced
in runtime:
● DP master (CPU or CP in the AS)
● DP slaves (for example, ET 200M, ET 200iSP)
● IO controller (for example, CPU in AS)
● IO devices (for example, ET 200M, ET 200SP HA)
● Redundant interface modules (for example, IM 153-2; IM 152-1; IM 155-6 HA)
● Bus links (for example DP/PA-Link; FF Link, Compact FF Link).
● Input/output modules
● Fieldbus cables (PROFIBUS DP, PROFIBUS PA, PROFINET, FOUNDATION Fieldbus)
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 189
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