Online Replacement of Unit Section 5 Maintenance
198 3BSE036351-510 A
Online Replacement of Unit
Replacement online entails adding or removing units in a controller without
disturbing the execution of the running application program. Units are connected to
the CEX-Bus and the electrical ModuleBus (S800 I/O).
CEX-Bus
Communication interfaces (CI8xx)
Can be removed or replaced online.
Restrictions apply, refer to the
installation section for each interface
and to Appendix A, Hardware Units.
Baseplates for CI8xx (TP8xx) Must not be replaced online.
ModuleBus
S800 I/O units
Can be removed or replaced online.
Module Terminal Units (MTUs) Must not be replaced online
Redundant CPUs
Processor unit
Can be removed or replaced online
(see the next following pages)
RCU Link Cables Can be removed or replaced online.
However, the following restriction
applies; you cannot replace the RCU
link cable online in a previous than 4.1
software version. For more
information, see the instructions given
in Exchanging a Defect RCU Link
Cables Online on page 202.
It is not allowed to manipulate CEX bus baseplates in a powered and running
system. Before changing or removing a baseplate, all CEX modules on that
segment must be removed.
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