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Chapter 4 Programming The operands utilized by the redundancy control modules P-2006_1.000 and P-2006_2.000 cannot be configured as redundant. In redundant systems, at least one operand must be configured as redundant. Example of Definition of Redundant Operands As an example, we will take an application program comprising the E-.001 module containing the following logics. • 4-48 The operands E0000.0, E0000.1 and E0000.2 do not need to be configured as redundant because they are input points.