Index Register Setting; Label Initial Value Reflection Setting - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

Index Register Setting

Check that seven points or more are set to the index register (Z). (The default setting is 20 points.)
[CPU Parameter]  [Memory/Device Setting]  [Index Register Setting]
Precautions
The range displayed in the option of the engineering tool (Z0 to Z6) is used for internal processing.
Therefore, do not use Z0 to Z6 of the index register in the program where the process control extension is enabled, and
functions and function blocks used in that program.

Label Initial Value Reflection Setting

Check that "Disable" is set to "Label Initial Value Reflection Setting at STOP to RUN" of "Label Initial Value Reflection Setting".
(The default setting is "Disable".)
[CPU Parameter]  [File Setting]  [Label Initial Value Reflection Setting]
2 PROCEDURE BEFORE USING PROCESS CONTROL FUNCTION BLOCK
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2.2 Setting CPU Parameters