Allen-Bradley LOGIX 5000 User Manual

Chapter 5
Statistical Instructions
390 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
See Structured Text Syntax for more information on the syntax of expressions
within structured text.
Description
The MAXC instruction executes this algorithm:
Condition Action
Reset is set LastMaximum = Reset value
Out = LastMaximum
Reset is cleared If In > LastMaximum then update LastMaximum.
Out = LastMaximum.
Affects Math Status Flags
No
Major/Minor Faults
None specific to this instruction. See Common Attributes for operand-related
faults.
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.

Allen-Bradley LOGIX 5000 Specifications

General

Brand	Allen-Bradley
Model	LOGIX 5000
Category	Controller
Language	English