ABL (ASCII test for buffer line)

The ABL instruction counts the number of ASCII characters in the input buffer up to including the end-of-line termination character.
Languages supported: Function block diagram, ladder diagram, structured text.
This instruction applies to the L20E, L50E, and L70E controllers.
ABL
ABL
ABL parameters
Parameter
Parameter Type
Data Type
Description
IN
Input
BOOL
Rung input state.
  • TRUE: When Rising Edge is detected, start the function block with the precondition that the last operation is complete.
  • FALSE: The instruction block is idle.
ABLInput
Input
ABLACB
The channel to be operated.
Use the ABLACB data type to define the Channel, TriggerType, and Cancel parameters for ABLInput.
Q
Output
BOOL
Indicates when the character count is ongoing or complete.
The outputs update asynchronously from the program scan. Output Q cannot be used to re-trigger the instruction since IN is edge triggered.
  • TRUE: The function block is complete.
  • FALSE: The function block is not complete.
Characters
Output
UINT
The number of characters in the buffer. The buffer limit is 82 characters.
Error
Output
BOOL
Indicates the existence of an error condition.
  • TRUE: An error is detected.
  • FALSE: No error.
ErrorID
Output
UINT
A unique numeric that identifies the error. The errors for this instruction are defined in ABL error codes.
ABL error codes
Error Code
Description
03
Transmission cannot be completed because the Clear-to-Send signal was lost.
06
Illegal parameter was detected.
07
Cannot complete ASCII send or receive because channel configuration has been shut down using the channel configuration dialog.
08
Cannot complete ASCII Write due to an ASCII transmission already in progress.
09
ASCII communication requested is not supported by current channel configuration.
10
The Cancel was set, stopping instruction execution. No action required.
11
The requested length for the string is not valid, a negative number, greater than 82, or 0. Applies to ARD and ARL function blocks.
13
The requested (.LEN) in the control block is a negative number or a value greater than the string size stored with the source string. Applies to AWA and AWT function blocks.
14
The ACL function block was canceled.
16
Serial port is not supporting RTS or CTS control lines.

ABL examples

ABL function block diagram example
ABL function block diagram example
ABL ladder diagram example
ABL ladder diagram example
ABL structured text example
ABL structured text example
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