ABB AC 800M

Special functions Section 6 Program Code Issues
96 3BSE042835-600
Special functions
Handling of Input and Output Values
The code shall handle its input and output values in the following way:
The code shall have a predictable and reasonable behavior for all input values. Input
values, which are considered invalid, shall be mapped to valid input values. It shall
be described in the parameter description which values are considered invalid and
which valid values these are mapped to. For further details see Range Check on
page 103.
The object must have a predictable behavior when calculating output parameter
values. Situations like divide by zero and sqrt() of negative numbers shall be
prevented or handled in the code. The library object shall not give an overflow
output value if none of the input parameters have an overflow value.
Parameters of direction out and Parameters of direction in_out with the description
keyword OUT or OUT(IN) shall be written to in each scan.