6. REDUNDANCY WITH NX3030 CPU
Program associated with MainTask (MainPrg): It must be, obligatory, in ST language, as MasterTool disables the other
options
Programs associated with redundancy Main Tasks
Figure 182: Specific Programs Language
ATTENTION
The ActivePrg and NonSkippedPrg POUs are created automatically, empty, in language se-
lected on the previous questions. Other POUs which are created manually by the user can
be used in any available language, except in redundant POUs which can’t be written in SFC
language as it uses the IEC timer as background. For further information see Limitations on
a Redundant PLC Programming.
ATTENTION
The MainPrg POU will always be automatically generated in ST language, and cannot be
changed by the user. This POU calls the ActivePrg (only in the Active PLC) and Non-
SkippedPrg (in both PLCs) POUs.
After receiving the answers for the previous questions, the Wizard generates the main project, defining a half-cluster with
the following initial hardware configuration:
Selected rack
Power supply NX8000 (positions 0 and 1)
NX3030 CPU (positions 2 and 3)
NX4010 modules (positions 4 and 5) and Panel PX2612 if selected.
After the NX4010 module, NX5001 are inserted to implement PROFIBUS network with the features previously inserted
by the user
After the NX5001 modules, NX5000 are inserted to implement Ethernet network with the features previously inserted
by the user
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