ExST Assignment as An Expression

In ExST, as an extension to the IEC 61131-3 standard, CODESYS permits the use of assignments as expressions.

Example 68. Examples

`int_var1 := int_var2 := int_var3 + 9;`	(* `int_var1` and `int_var2` receive the value of `int_var3 + 9` *)
`real_var1 := real_var2 := int_var;`	(* `real_var1` and `real_var2` get the value of `int_var` *)
`int_var := real_var1 := int_var;`	(* incorrect assignment, the data types do not correspond *)
`IF b := (i = 1) THEN` `i := i + 1;` `END_IF`