Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 617
ASCII String Instructions (CONCAT, DELETE, FIND, INSERT, MID) Chapter 18
Execution:
Example: When temp_high is set, the INSERT instruction adds the characters in string_2 to
position 2 within string_1 and places the result in string_3:
Relay Ladder
Structured Text
IF temp_high THEN
INSERT(string_1,string_2,2,string_3);
temp_high := 0;
END_IF;
Condition Relay Ladder Action Structured Text Action
Prescan The rung-condition-out is set to false. No action taken.
Rung-condition-in is false The rung-condition-out is set to false. N/A
Rung-condition-in is true The instruction executes.
The rung-condition-out is set to true.
N/A
EnableIn is set N/A EnableIn is always set.
The instruction executes.
Instruction execution The instruction inserts the specified characters.
Postscan The rung-condition-out is set to false. No action taken.
temp_high
Insert String
Source A string_1
'AD'
Source B string_2
'BC'
Start 2
Dest string_3
'ABCD'
INSERT
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