Allen-Bradley LOGIX 5000

Select_Limit Instructions
Chapter 4
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018 361
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.
Example
This HLL instruction limits In between two values and sets HighAlarm or
LowAlarm, if needed when In is outside the limits. The instruction sets Out =
limited value of In.
Function Block
Structu
red Text
HLL_01.In := value;
HLL_01.HighLimit := high_limit;
HLL_01.LowLimit := low_limit;
HLL(HLL_01);
limited_value := HLL_01.Out;
high_alarm := HLL_01.HighAlarm;
low_alarm := HLL_01.LowAlarm;
See also
Common Attributes on page 537
Structured Text Syntax on page 508