Automatic control function programming manual ladder language

Operation
This function is used to receive the string entered at the end of an operator dialogue.
The system ends the string with a ZERO byte.
If the dialogue is still in progress (line feed key not pressed), the code 0 is returned. It is therefore necessary to call
scans() cyclically until the end of the dialogue.
Return code
If OK
0: Dialogue in progress.
n > 0: Number of characters transferred into &dest (the dialogue is finished).
Error
-1: Not in transparent mode, the calling task is not a %TF task.
-2: No dialogue in progress.
Programming error causing a CPU fault
Access to a prohibited address:
- &dest parameter error,
- end of acquisition field outside authorised error.
8.2.9 Read and Convert a Decimal Number scand
Syntax
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scand(&lvariable)
&lvariable: Address of an .L variable (e.g. %V100.L) where the ASCII -> signed integer
conversion of the string entered from the keyboard will be loaded.
Reads and converts a decimal value entered from the keyboard. This function must be called after a scano() or scanu()
dialogue opening function.
The conversion stops on the first non-decimal character. If no decimal characters are detected, %lvariable is loaded
with 0.
Operation
This function is used to receive the value of a decimal number at the end of an operator dialogue.
If the dialogue is still in progress (line feed key not pressed), the code 0 is returned. It is therefore necessary to call
scand() cyclically until the end of the dialogue.