626 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 19 ASCII Conversion Instructions (STOD, STOR, DTOS, RTOS, UPPER, LOWER)
Execution:
Example: After reading the weight from a scale (weight_read.EM is set) the STOR
instruction converts the numeric characters in weight_ascii to a REAL value.
You may see a slight difference between the fractional parts of the Source and
Destination.
Relay Ladder
Structured Text
IF weight_read.EM THEN
STOR(weight_ascii,weight);
weight_read.EM := 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 S:C is set.
Destination is cleared.
The instruction converts the Source.
If the result is zero, then S:Z is set
Postscan The rung-condition-out is set to false. No action taken.
weight_read.EM
String to Real
Source weight_ascii
'428.259'
Dest weight
428.259
STOR
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