Allen-Bradley LOGIX 5000 Reference Manual page 118

Chapter 1 Process Control Instructions
Control at Start of
First Scan
Operator Control
Program Control
Control at
Start of First
Scan
Operator
Control
Program
Control
118
Structured Text
Condition/State
Prescan
Normal Execution
Postscan
Initial Mode Applied on Instruction First Scan
The following table shows the ending control based on the program request
inputs.
ProgOperReq ProgProgReq
false true
na false
true Na
na Na
false false
false true
na Na
false false
The following table shows the ending control based on the Manual, Auto, and
Hold mode requests.
Oper Oper Prog
Auto Man Auto
Req Req Req
na na na
na na na
na na na
na na false
na na na
na na true
na na na
na na na
na na na
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Action Taken
See Prescan in the Function Block table.
See Tag.EnableIn is true in the Function Block table.
See Postscan in the Function Block table.
ProgValueReset
false
na
false
true
false
false
true
false
Prog Prog Man
Man Hold Hold
Req Req AftInit
na na false
na na na
na na true
false false false
na na false
false false false
true false false
na true false
na na true
FirstRun Control at End of First
Scan
na Program Control
na Operator Control
false Operator Control
true Operator Control
true Operator Control
na Program Control
false Program Control
false Program Control
Prog First Control at End
Value Run of First Scan
Reset
na false Operator Current
mode
na Operator Manual
mode
na na
na false Program Current
mode
true false
false na Program Auto
mode
false na Program Manual
mode
false na Program Hold
mode
na na