Automatic control function programming manual ladder language

Transparent Mode
8.2.7 Open a Numerical Keypad Acquisition scanu
Syntax
scanu(&question, width)
&question: Address of a character string (ending with a ZERO byte).
width:
Opens a keypad acquisition.
Maximum width of the entry field.
Operation
Scanu() operates in the same way as scano() except that the line editor inhibits entry of characters others than decimal
digits (0, 1 ... 9).
! CAUTION
This function can only be used with the 12 line x 40 column font. Entry is on the 11th line,
with deletion of the line just above.
Return code
If OK
0
Error
-1: Not in transparent mode, the calling task is not a %TF task.
-2: Resource already in use (a keyboard acquisition is already in progress).
Programming error causing a CPU fault
Access to a prohibited address:
- &question parameter error,
- end of string outside authorised area.
8.2.8 Read a String scans
Syntax
scans(&dest)
&dest: Address of the memory area (%M or %V) where the characters entered
from the keyboard will be stored.
Reads a keyboard entry. This function must be called after a scano()( or scanu() dialogue opening function.
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