Automatic control function programming manual ladder language

Return code
If OK
If > 0: The positive direction (increasing numbers) is the shortest. Indicates
the number of steps.
If < 0: The negative direction (decreasing numbers) is the shortest. The
absolute value indicates the number of steps.
If = 0: No movement is required because the carousel is already in the
destination position.
If = n: Outside carousel.
6.16 Search for the Value of a Byte rchb
Syntax
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rchb(&source, b, step, n)
&source: Search start address.
b: Value of the byte to be searched for.
step: Value of the search step in bytes.
n: Maximum number of search steps.
Search, with a step, for the first occurrence of byte b starting from address &source.
The step can be positive or negative.
Positive step: The search is made by increasing addresses.
Negative step: The search is made by decreasing addresses.
Return code
Value found
Positive number equal to the number of steps made to the first occurrence.
Positive step: Return code = (occurrence address - &source)/step
Negative step: Return code = (&source - occurrence address)/(-step)
Value not found
-1: Value not found
Programming error causing a CPU fault
Access to a prohibited address:
- &source parameter error,
- &source+step*n outside authorised area.