plc - Is mixing types allowed in ST (Structured Text) -

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i wonder if allowed standard (iec 1131-3) mix different data types in expression.

example

var : bool;     b : int;  (* ... *)  if (b , c)   ... end_if

you must use explicit type conversion functions when converting "down" in types. "up" conversion done implicitly.

var : bool;     b : int; (* ... *) if (int_to_bool(b) , c)   ... end_if

there forms of these type conversion in form of typea_to_typeb()


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