Automatic control function programming manual ladder language

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.
6.19 Return to Calling Module or Network return
Syntax
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return([numerical_expression])
numerical_expression: Value returned to the calling module.
Operation
Returns:
- To the calling module in the case of an intermodule call with the form = sp(....). In this case, the value
of the numerical expression is recovered in .
- To the calling ladder network in the case of an intra-module call with the form call(). In this case, the returned
value, if any, cannot be recovered.
Return code
No code is reported by the function itself.
! CAUTION
This function cannot be called in the test zone.
REMARK An assignment with the form %M20.B = return(Var_ 1+3) is meaningless.