628 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 19 ASCII Conversion Instructions (STOD, STOR, DTOS, RTOS, UPPER, LOWER)
Execution:
Example: When temp_high is set, the DTOS instruction converts the value in msg_num to
a string of ASCII characters and places the result in msg_num_ascii. Subsequent
rungs insert or concatenate msg_num_ascii with other strings to produce a
complete message for a display terminal.
Relay Ladder
Structured Text
IF temp_high THEN
DTOS(msg_num,msg_num_ascii);
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 converts the source.
Postscan The rung-condition-out is set to false. No action taken.
temp_high
DINT to String
Source msg_num
23
Dest msg_num_ascii
'23'
DTOS
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