Types Of Hardware Migration - Fallback Strategies - Siemens SIMATIC S7-300 Manual For Migrating

4 Hardware Migration
4.1.3 Types of hardware migration – fallback strategies
For a hardware migration the implementation strategy has to be selected first.
Resources, time and financial aspects as well as risks have to be evaluated very
carefully.
Table 4-1
Type
Hot Migration Parallel installation of the old
and new system
Sensors provide signals for
both systems
Actuators are controlled by the
legacy system
Outputs of the new system
are compared with those of
The controller remains
in the legacy system until the
Warm migration Parallel installation of the old
and new system
Sensors provide signals for
both systems
During downtimes sensors and
actuator signals are applied to
the new system
Dismantling the old system is
carried out after successful
restart
Cold migration Dismantling the old system is
carried out during standstill
Installation of the new system
Restart of the new system
Migration S7-300/S7-400 nach S7-1500
Entry ID: 109478811, V1.1,
Description
the legacy system
new system has been tested
05/2017
Advantages Disadvantages
Minimized risk Highest costs
Shortest
downtime
Average costs
Average risk
Average downtime
Minimized costs Highest risk
Longest downtime
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