Allen-Bradley LOGIX 5000 Reference Manual page 394

Chapter 5 Statistical Instructions
394
Execution
Function Block
Condition/State Action Taken
Prescan EnableIn and EnableOut bits are cleared to false.
Tag.EnableIn is false EnableIn and EnableOut bits are cleared to false.
Tag.EnableIn is true EnableIn and EnableOut bits are set to true.
The instruction executes.
Instruction first run N/A
Instruction first scan Set request to initialize the Maximum value with the current input.
Postscan EnableIn and EnableOut bits are cleared to false.
Structured Text
Condition/State Action Taken
Prescan See Prescan in the Function Block table.
Normal Execution See Tag.EnableIn is true in the Function Block table.
Postscan See Postscan in the Function Block table.
Examples
If Reset is set, the instruction set Out=ResetValue. If Reset is cleared, the
instruction set Out=In when In < LastMinimum. Otherwise, the instruction sets
Out= LastMinimum.
Function Block
Structured Text
MINCTag.In := input_value;
MINCTag.Reset := reset_input;
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018